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    Adsorptive performance of new Mn-Fe@activated carbon magnetic nanohybrid material synthesized from black cumin (Nigella sativa) industrial processing wastes for lead removal
    (Springer Science and Business Media Deutschland GmbH, 2024) Teymur, Yekbun Avşar; Güzel, Fuat; Koyuncu, Filiz
    In this study, the adsorptive property of a novel manganese ferrite-activated carbon magnetic nanohybrid (Mn-Fe@BAC) material synthesized by coating with manganese ferrite (MnFe2O4) nanoparticles of activated carbon (BAC) produced under optimized carbonization conditions with potassium carbonate activation method from industrially processed black cumin (Nigella sativa) waste was used as an adsorbent in remediation of artificially contaminated water with lead (II) ions (Pb2+). Experiments were performed to examine the systematic effects of process parameters such as synthesized material amount, initial Pb2+ ion concentration, interaction time, and system temperature on the investigated adsorption system at the pH (5.06) of Pb2+ in an aqueous solution. Experimental kinetic and equilibrium isotherm data were analyzed in commonly used models and were well-fitted by pseudo-second-order and Langmuir models, respectively. The kinetic sorption mechanism was found to occur in multiple steps. The maximum Pb2+ adsorbing ability of the Mn-Fe@BAC was 294 mg/g at 20 °C. Thermodynamic analysis showed that the process was spontaneous and exothermic. In addition, it showed reuse stability up to four adsorption–desorption cycles for Pb2+ ions. In conclusion, this study highlights that it is an ultra-effective adsorbent that can be easily separated magnetically in the remediation of water contaminated with Pb2+ ions.
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    Adsorptive removal of diclofenac sodium from aqueous solution via industrial processed citrus solid waste-based activated carbon: optimization, kinetics, equilibrium, thermodynamic, and reusability analyses
    (Springer Heidelberg, 2023) Guzel, Fuat; Koyuncu, Filiz
    In this research, the adsorptive ability of a novel activated carbon (CWAC) prepared from citrus industrial processing waste (CW) via phosphoric acid activation in decontaminating synthetically contaminated water with diclofenac (DCF), selected as a high toxicity model drug, was examined in detail. Optimum adsorption conditions were decided by analyzing the impacts of effective experimental parameters such as CWAC amount, DCF concentration, adsorption time, and ambient temperature. Experimental results were evaluated in kinetic, isothermal, thermodynamic, and intra-particle diffusion models to characterize the CWAC-DCF adsorption system. The kinetic and equilibrium isotherm data conformed the Lagergren and Langmuir models, respectively. The maximum amount of DCF adsorbed by CWAC was determined to be 185.19 mg/g under the specified optimum operating conditions. The values of the calculated thermodynamic parameters indicated that the process was endothermic and spontaneity increased at high temperatures. In addition, the CWAC was observed to maintain its high adsorption capacity even after five regeneration cycles. The adsorption mechanism was clarified by SEM and FT-IR spectroscopic examinations. The results of this research demonstrated the applicability of CWAC as a highly effective and reusable alternative adsorbent for decontamination of DCF-contaminated water.
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    Application of an industrial agricultural waste-based activated carbon in the treatment of water contaminated with Reactive Blue 19 dye: optimization, kinetic, equilibrium and recyclability analyses
    (Taylor & Francis Inc, 2023) Koyuncu, Filiz; Avsar Teymur, Yekbun; Guzel, Fuat
    This study is concerned with the examination of the sorptive ability of a new carbonaceous (CPC) sorbent prepared under optimized conditions with H3PO4 activation from the citrus industrial processing pulp (CP) in removing Reactive Blue 19 dye (RB19) from an aqueous solution. Optimum removal conditions were determined based on the maximum effects of some variable process parameters. The kinetic data showed agreement with the pseudo-second-order model. The isotherm data fit the Langmuir isotherm model best, and the maximum amount of sorbed RB19 was determined as 437.89 mg/g. The calculated thermodynamic parameters showed that the process is spontaneous and endothermic in nature. Desorption studies were performed with various desorbents for the recovery of RB19 and/or recyclability of CPC. The results show that CPC is a highly effective and reusable sorbent for cleaning water containing RB19.
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    Conversion of citrus industrial processing solid residues to well-developed mesoporous powder-activated carbon and its some water pollutant removal performance
    (Springer Heidelberg, 2021) Güzel, Fuat; Koyuncu, Filiz
    The aim of the present study is to produce and characterize the activated carbon (AC) material from citrus industrial processing solid residues (CR) under optimized conditions depending on process variables such as chemical impregnation ratio (H3PO4/CR, w/w), carbonization/activation temperature, and time with the phosphoric acid activation and to examine its performance in removing some impurities from water. The optimal AC, which has the surface area of 1090 m(2)/g, the total pore volume of 1.569 cm(3)/g, mesopore contribution of 96.30%, and average pore diameter of 4.93 nm, was produced under these following conditions: 3:1 impregnation ratio (W-H3PO4/W-CR), 500celcius activation temperature, and 1 h activation time. It was characterized by various physicochemical techniques. Furthermore, the adsorptive behavior in water was tested by using Reactive blue 19 (RB19) dye, Diclofenac (DCF) drug, and Pb(II) ions selected as the model adsorbates. Its maximum removal capacity was determined as 370 mg/g for RB19, 181 mg/g for DCF, and 111 mg/g for Pb(II) at 30celcius. This study showed that CR can be used as an effective feedstock in AC production to remove organic and inorganic pollutants from water.
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    Decolorisation of aqueous crystal violet solution by a new nanoporous carbon: Equilibrium and kinetic approach
    (ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA, 2014) Güzel, Fuat; Saygılı, Hasan; Akkaya Saygılı, Gülbahar; Koyuncu, Filiz
    A new nanoporous carbon from tomato paste waste (TWNC) was prepared. The surface area, total pore volume, average pore diameter of TWNC was found as 722.17 m(2) g(-1), 0.476 cm(3) g(-1) and 2.644 nm, respectively. The effects of solution pH, adsorbent dose, initial concentration, ionic strength, contact time, and temperature were studied. Adsorption kinetics was found to behest represented by the pseudo second order model. Isotherm data were fitted well to the both Langmuir and Freundlich models. Maximum adsorption capacity was found as 68.97 mg g(-1) at 50 degrees C. Thermodynamic parameters showed that the process was spontaneous and endothermic. (C) 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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    Development and physicochemical characterization of a new magnetic nanocomposite as an economic antibiotic remover
    (Inst Chemical Engineers, 2015) Saygili, Gulbahar Akkaya; Saygili, Hasan; Koyuncu, Filiz; Guzel, Fuat
    Maghemite (T-Fe2O3) nanoparticles were impregnated to nanoporous carbon obtained from tomato waste (TWNC). The prepared magnetic composite (MTWNC) was characterized and used to remove tetracycline (TC) from water and then easily be separated from the medium by a magnetic technique. The morphologies and surface chemistries of both magnetic and non-magnetic nanoporous carbons were studied by FTIR, XRD, SEM, SEM-EDX, VSM, BET surface area, proximate and elemental analysis determinations. Batch adsorption studies were carried out and the effects of pH, initial TC concentration, adsorbent dose, ionic strength and temperature were investigated. The adsorption kinetics of TC on MTWNC could be expressed well by the pseudo-second order model, and sorption isotherms were described by Langmuir equation with maximum adsorption capacity of 60.60 mg/g at pH 4 and 50 degrees C. Thermodynamic parameters showed that the adsorption of TC onto MTWNC was feasible, spontaneous and endothermic. Furthermore, the recyclability of the adsorbent was tested with 0.01M NaOH solution, and the results show that the synthesized composite adsorbent could be employed repeatedly in wastewater treatment. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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    Elimination of anionic dye by using nanoporous carbon prepared from an industrial biowaste
    (Elsevier Science Bv, 2014) Guzel, Fuat; Saygili, Hasan; Saygili, Gulbahar Akkaya; Koyuncu, Filiz
    The preparation of nanoporous carbon from tomato waste (TWNC), and its ability to remove Orange II (OII) dye were reported. The TWNC was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Brunauer Teller surface area (BET), Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). The effects of initial concentration, solution pH, adsorbent dosage and temperature were investigated. The kinetic data followed a pseudo-first order model. The mechanism of the process was determined from the intraparticle diffusion model. The isotherm analysis indicated that the adsorption data could be represented by the Langmuir model. The maximum monolayer adsorption capacity was determined as 312.5 mg g(-1), under determined optimum conditions of variables (pH 2.0, adsorbent dosage 0.1 g L-1, contact time 180 mm and temperature 50 degrees C). Thermodynamic study showed that the adsorption was spontaneous and endothermic. The results indicate that TWNC can be employed as low-cost alternative to expensive commercial activated carbon for treatment of industrial wastewater containing OIL. (C) 2014 Elsevier B.V. All rights reserved.
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    Endüstriyel işlenmiş kırmızıbiber atıklarından değişik koşullarda üretilen nanogözenekli karbonlu materyallerin sulu fazdan bazı su kirleticilerini uzaklaştırma ve süperkapasitör performanslarının incelenmesi
    (Dicle Üniversitesi, Fen Bilimleri Enstitüsü, 2022) Koyuncu, Filiz; Güzel, Fuat
    Atık değeri çok yüksek olan endüstriyel işlenmiş kırmızıbiber atıklarından ilk kez çeşitli üretim koşullarında nanogözenekli karbonlu materyaller üretmek ve onların çeşitli su kirleticilerini adsorplama ile elektrot materyali olarak kullanılabilme performanslarını incelemektir. Bu amaçla, öncelikle bu atığın nanogözenekli karbonlu materyaller üretmek için hammadde olarak kullanabilirliği termogravimetrik, biyokimyasal bileşen, proksimate ve ultimate analizleri yapılarak tespit edildi. Sonra, bu atıktan biyosorplayıcı, tek basamaklı KOH aktivasyonuyla belirlenen optimum üretim koşullarında (emdirme oranı: 1,5:1,0 gKOH:gKBA; karbonizasyon sıcaklığı: 700 oC; karbonizasyon süresi: 1 saat) aktif karbon, 700 oC karbonizasyon sıcaklığı ve 1 saat karbonizasyon süresinde pirolitik biyokarbon, üretilen pirolitik biyokarbonun 800 oC karbonizasyon sıcaklığı ve 1 saat karbonizasyon süresinde CO2 ile fiziksel olarak aktive edilmiş biyokarbon; üretilen pirolitik biyokarbon ile FeSO4 ve FeCl3 nanoparçacıklarının bazik ortamda birlikte çöktürülmesiyle üretilen manyetik biyokarbon ve otojenik basınçta 5,0:1,0 gsu:gKBA emdirme oranı, 250 oC karbonizasyon sıcaklığı ve 10 saat karbonizasyon süresinde hidrolitik biyokarbon üretildi. Bunlar, öncelikle proksimate, ultimate, 77 K sıcaklıkta azot gazı adsorpsiyonu, iyot ve metilen mavisi indisleri ile gözenek yapısı, X-ışını difraksiyonu spektroskopisi, taramalı elektron mikroskobu-enerji dağılımlı X-ışını spektroskopisi, Fourier dönüşümlü kızılötesi spektroskopisi, Raman spektroskopisi, titreşimli numune manyetometresi, yüzey sıfır yük pH değeri ve Boehm titrasyonu gibi fizikokimyasal tekniklerle karakterize edildi. Daha sonra, sulu çözeltiden adsorplama kapasitelerini tespit etmek için, metilen mavisi, metanil sarısı, 2,4-diklorofenoksiasetik asit, diklofenak sodyum, bakır ve nitrat gibi farklı gruplara ait su kirleticilerinin sulu ortamdan 25 oC sıcaklığında ve onların doğal pH değerlerinde uzaklaştırmak için adsorpsiyon çalışmaları gerçekleştirildi. Ayrıca elektokimyasal hücrelerde elektrot malzemesi olarak kullanımı test etmek için süperkapasitör performansı incelendi. Bu amaçla, nanogözenekli karbonlu materyallerin süperkapasitör performansını test etmek için döngüsel voltametri, sabit akım (galvanostatik) şarj-deşarj ve elektrokimyasal impedans spektroskopisi kullanıldı. Sonuç olarak, fizikokimyasal tekniklerle karakterizasyonu yapılan kırmızıbiber atığının hem biyosorplayıcı hem de değişik nanogözenekli karbonlu materyallerin üretimi için iyi bir hammadde lduğu belirlendi. Ayrıca sulu çözeltiden kirlilikleri uzaklaştırmada adsorplayıcı ve elektokimyasal hücrelerde elektrot malzemesi olarak kullanımda en yüksek performansın üretilen nanogözenekli karbonlu materyaller arasında aktif karbon ait olduğu tespit edildi.
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    High surface area and supermicroporous activated carbon from capsicum (Capsicum annuum L.) industrial processing pulp via single-step KOH-catalyzed pyrolysis: Production optimization, characterization and its some water pollutants removal and supercapacitor performance
    (Elsevier Science SA., 2022) Koyuncu, Filiz; Güzel, Fuat; İnal, Işıl Gürten
    In this study, we aimed to convert capsicum (Capsicum annuum L.) industrial processing pulp (CP) into low-cost and high-quality activated carbon (AC) under optimal production conditions through single-step KOH-catalyzed pyrolysis. Optimal production conditions were determined by investigating the effects on some textural characteristics of the produced ACs by changing the process variables such as mixing ratio (KOH/CP, w/w), pyrolysis temperature, and pyrolysis duration, respectively. The AC (CPAC) with the BET (Brunauer-Emmett-Teller) highest surface area (1564 m(2)/g), pore-volume (0.623 cm(3)/g), and average pore size (1.8 nm) was produced under conditions with a mixing ratio of 1.5, a pyrolysis temperature of 700 degrees C, and a duration of 1 h. It was characterized by nitrogen adsorption/desorption, Scanning Electron Microscopy (SEM)/Energy Dispersive X-Ray (EDX), X-ray Diffraction (XRD), Raman Microscopy and Fourier Transform Infrared Spectroscopy (FT-IR) techniques. In addition, the adsorption ability was determined by examining the removal performance of water pollutants such as methylene blue (MB) and methanol yellow (MY) dyes, 2,4-dichlorophenoxyacetic acid herbicide (2,4-D), diclofenac sodium drug (DCF), copper(II) ion (Cu(II)), and nitrate (NO3-), which were chosen because they are frequently detected in industrial wastewater, and found to be 294.1, 370.4, 384.6, 294.1, 212.8 and 59.5 mg/g, respectively. The supercapacitor performance of the electrodes developed from CPAC was tested as the coin size cell. The gravimetric capacitances of the electrodes were calculated as 198 F/g at the current densities of 0.5 A/g. The results of this study reveal that CPAC can be used as an alternative to commercial carbon as a clean and ecologically compatible low-cost (similar to$1.75 per kg) adsorbent that can improve water quality, and promising electrode material for low-cost and high-performance carbon-based supercapacitors.
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    Improving the rate capability of microporous activated carbon-based supercapacitor electrodes using non-porous graphene oxide
    (Springer, 2023) Inal, I. Isil Gurten; Koyuncu, Filiz; Perez-Page, Maria
    In this work, high-rate-capability supercapacitor electrodes based on a green, sustainable, graphene oxide-assisted microporous activated carbon (AC) were developed by a facile method. Highly microporous ACs were produced from tea factory waste using different amounts of potassium carbonate (K2CO3). Non-porous GO sheets were prepared by anodic electrochemical exfoliation in a 0.1 M (NH4)(2)SO4 aqueous solution. The materials were characterized by N-2 adsorption-desorption, particle size, XPS, Raman, and SEM techniques. The electrochemical performance of ACs was examined by using a 6 M KOH electrolyte with CV, GCD, and EIS methods. It was determined that the activated carbon sample (AC-IR1.5), prepared using a mass ratio of (1.0:1.5) of tea factory waste: K2CO3, exhibited the best electrode performance. These highly reversible best-performing AC-based electrodes prepared from AC-IR1.5 with the highest micropore volume fraction were physically mixed with GO in mass ratios, (AC-IR1.5: GO) of 90:10, 75:25, 60:40, and examined as the supercapacitor electrodes along with AC-based electrodes. The electrochemical characterization results showed that a significant enhancement in the rate capability was achieved by AC-IR1.5: GO electrodes compared to AC-based ones. The capacitance retention of AC-IR1.5: GO (75:25) was found to be at least twice as higher (84%) than that of AC-based electrodes (39%) at a high current density of 10 A g(- 1).
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    Investigating the surface properties of red pepper industrial waste-based activated carbons for use as reversible supercapacitor electrodes
    (Elsevier Ltd, 2023) İnal, İ. Işıl Gürten; Koyuncu, Filiz; Güzel, Fuat
    This study presents the development of green and sustainable supercapacitor electrodes using activated carbons derived from industrial waste from red pepper (RPW) via conventional chemical activation using ZnCl2 at various carbonization/activation temperatures. The activated carbon samples were subjected to various analytical techniques, including elemental analysis, N2 adsorption-desorption, Raman, FT-IR, and SEM-EDS. The resulting carbon samples were then used to prepare standard coin-sized supercapacitor cells, which were tested using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques with a 6 M KOH electrolyte. The BET surface area and surface functionality of the samples decreased as the temperature increased. The material produced at the highest temperature (AC800) exhibited the lowest gravimetric capacitance value (131 F/g). However, it demonstrated perfectly reversible electrochemical behavior with the highest capacitance retention of 50 % (between 0.5 A/g and 10 A/g) and cyclic stability (>96 %) over 10,000 cycles among all the other materials. Conversely, the electrode material produced at the lowest temperature (AC600) had the highest gravimetric capacitance value of 175 F/g but the lowest electrochemical stability due to the contribution of pseudo faradaic processes in the storage mechanism.
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    Low formaldehyde-emission particleboards with the addition of Scots pine wood waste derived activated carbon
    (Taylor & Francis Ltd, 2024) Ergün, Mehmet Emin; İstek, Abdullah; Özlüsoylu, İsmail; Koyuncu, Filiz; Bülbül, Şaban
    Free formaldehyde released after particleboard production poses significant risks to human and environmental health. This study investigated the impact of adding activated carbon produced from pine wood waste to particleboard on formaldehyde emissions to lessen this risk. In the first stage of the study, pine wood waste was activated with zinc chloride (ZnCl2) at 600 degrees C for 90 min to produce activated carbon. The activated carbon was examined by scanning electron microscope, thermogravimetric analysis, Brunauer-Emmett-Teller (BET) analysis, fourier-transform infrared spectroscopy and X-ray diffraction. BET surface area of the produced activated carbon was 1102 m2/g. In the second stage of the study, activated carbons (0.5%, 1.0% and 1.5%) were added to a commercially preferred three-layer particleboard to enhance its mechanical, thermal and physical properties. In addition, the effects of the activated carbon on the free formaldehyde emissions of particleboard at 0 and 6 months were investigated. It was found that the free formaldehyde emissions of particleboards with activated carbon addition decreased by 24% at 0 months- and 6 months by 27% compared to the control group. Thus, waste material that has become a more valuable product as activated carbon will minimize harm to the environment and humans.
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    Mandalina kabuklarından nano-gözenekli aktif karbon üretilmesi ve sulu fazdan bazı toksik boyarmadde ve karışımları için adsorplama yeteneğinin incelenmesi
    (2016) Koyuncu, Filiz; Güzel, Fuat
    Aktif karbon yüksek yüzey alanı, gözeneklilik ve yüksek adsorplama kapasitesinden dolayı yaygın bir şekilde kullanılan adsorplayıcılardan biridir. Aktif karbon atık miktarı fazla bitkisel hammaddelerden kolaylıkla elde edilebilmektedir. Bu yüksek lisans tezi kapsamında atık miktarı fazla olan mandalina kabuğu kullanılarak ilk kez mikrodalga ön işlemi uygulanarak nano-gözenekli aktif karbon hazırlama koşularının optimizasyonu hedeflendi. Bu amaçla, mandalina kabuğunun aktif karbon hazırlama uygunluğunu tespit etmek için bileşen, proksimate ve termogravimetrik analizleri yapılmıştır. Aktif karbonun hazırlanmasında kimyasal aktivatör olarak H3PO4 tercih edilmiştir. Aktif karbon hazırlama koşulları için 40 saniye 900 W mikrodalga ön işleminden sonra azot ortamında aktivatör emdirme oranı, karbonizasyon/aktivasyon sıcaklığı ve süre etkisi incelenmiştir. Üretim optimizasyon koşulları 40 saniye 900 W mikrodalga ön işlemi, 2:1 gH3PO4/gkabuk emdirme oranı, 500 oC karbonizasyon/aktivasyon sıcaklığı ve 1 saat karbonizasyon/aktivasyon süresi olarak belirlenmiştir. Belirlenen bu koşullarda hazırlanan aktif karbonun yüzey alanı ve gözenek boyu dağılımları, SEM, FT-IR, proksimate analiz, sıfır yük pH'sı ile Boehm titrasyonu gibi çeşitli fizikokimyasal yöntemlerle karakterize edilmiştir. Ayrıca sulu çözeltiden adsorplama kapasitelerini tespit etmek için metilen mavisi ve metanil sarısı adsorplanan olarak kullanılmıştır. Adsorplama kapasitesini optimize etmek için çözelti pH'ı, adsorplayıcı dozu, adsorplanan başlangıç derişimi, denge süresi ve sıcaklık etkileri gibi çeşitli parametrelerin etkileri incelenmiştir. Belirlenen optimum adsorpsiyon koşullarında kinetik ve izoterm çalışmaları gerçekleştirildi. Yapılan kinetik ve izoterm çalışmalarından, adsorpsiyonlarının kısa sürede, yüksek derişimlerde ve yüksek sıcaklıklarda gerçekleştiği gözlenmiştir. Bu çalışma sonucunda atık değeri yüksek olan mandalina kabuğundan üretilen optimal nano-gözenekli aktif karbonun gözenek karakteristiği ve çözeltiden adsorpsiyon kapasitesi göz önüne alındığında mandalina kabuğunun ticari aktif karbon üretiminde kullanılabileceği gözlenmiştir. Anahtar kelimeler: Mandalina kabuğu, Aktif karbon Metilen mavisi, Metanil sarısı, kinetik, izoterm.
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    New low-cost nanoporous carbonaceous adsorbent developed from carob (Ceratonia siliqua) processing industry waste for the adsorption of anionic textile dye: Characterization, equilibrium and kinetic modeling
    (Elsevier Science Bv, 2015) Guzel, Fuat; Saygili, Hasan; Saygili, Gulbahar Akkaya; Koyuncu, Filiz
    Carob (Ceratonia siliqua) processing industry waste (an) has been applied as an abundant, cheap and available precursor to produce a new nanoporous carbon (CWNC) for removal of an anionic textile dye, Reactive Black 5 (RB5), which is frequently used in the textile industry, from aqueous phase. CWNC was characterized by BET, FTIR, SEM, and XRD techniques, proximate and ultimate analyses, Boehm titration Method, pH(pzc), measurement iodine and Methylene blue numbers. Its surface area, total pore volume, average pore diameter was found as 921.07 m(2)g(-1), 0.571 cm(3) g(-1) and 2.482 nm, respectively. The influences on RB5 adsorption of various experimental factors such as adsorbent dose, solution pH, initial RB5 concentration, temperature and ionic strength were investigated. Adsorption kinetics was found to be best represented by the pseudo-second order model. The isotherm analysis indicated that the adsorption data could be represented by the langmuir model. The maximum adsorption capacity for RB5 was 36.90 mg g(-1) at 50 degrees C. Thermodynamic parameters showed that the process was spontaneous and endothermic. (C) 2015 Elsevier B.V. All rights reserved.
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    Optimal oxidation with nitric acid of biochar derived from pyrolysis of weeds and its application in removal of hazardous dye methylene blue from aqueous solution
    (Elsevier Sci Ltd, 2017) Guzel, Fuat; Saygili, Hasan; Saygili, Gulbahar Akkaya; Koyuncu, Filiz; Yilmaz, Cumali
    In this study, the optimal oxidized weeds-based biochar (OWC) with HNO3 was used as a sorbent to remove methylene blue (MB) dye from aqueous solution. The optimal oxidation conditions were determined according to the MB index (MI) of samples. Weeds-based biochar (WC) and its oxidized samples were characterized by their pore and chemical properties. The results showed that the oxidized WCs have a lower BET (Brunauer-Emmett-Teller) surface area, more oxygen functional groups, lower pH(pzc) and higher MI compared with the WC. Optimum conditions were determined considering the effect of process parameters such as the solution pH, initial MB concentration, agitation time and solution temperature for MB removal by the optimal OWC. The kinetic data followed the pseudo-second order kinetic model. The equilibrium data were best represented by the Langmuir isotherm model. The maximum MB sorption capacities of WC and optimal OWC were determined as 39.68 and 161.29 mg/g, respectively, under detected optimum conditions (pH 7.4, OWC dosage 0.1 g/50 mL, agitation time 480 min and temperature 50 degrees C). (C) 2017 Elsevier Ltd. All rights reserved.
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    Performance of grape (Vitis vinifera L.) industrial processing solid waste-derived nanoporous carbon in copper(II) removal
    (Springer Heidelberg, 2021) Guzel, Fuat; Saygili, Gulbahar Akkaya; Saygili, Hasan; Koyuncu, Filiz; Kaya, Nafiye; Guzel, Sureyya
    In this study, copper removal performance of new nanoporous carbon adsorbent (grape waste nanoporous carbon (GWNC)) produced from industrial grape processing solid waste (grape waste) under optimized conditions was investigated. The optimization of removal conditions was determined by examining the effects of GWNC dosage, pH, initial Cu(II) concentration, contact time, and temperature. Kinetic and isotherm data were evaluated in pseudo-first-order and pseudo-second-order kinetic models and Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models, respectively. Kinetic and isotherm data displayed that the Cu(II) adsorption onto GWNC can be well defined by the pseudo-second-order kinetic model and the Langmuir isotherm model. The diffusion mechanism of adsorption was explained using the intra-particle diffusion model. The Cu(II) removal capacity of GWNC at determined optimized conditions was determined to be 80.0 mg g(-1). The calculated thermodynamic data revealed the spontaneous and endothermic nature of the Cu(II) adsorption. Desorption studies showed that H2SO4 was the effective desorption agent with the desorption rate of 89.14%. The results in this study emphasized that GWNC is an alternative effective adsorbent to commercial adsorbents for Cu(II) removal.
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    Red pepper (Capsicum annuum L.) industrial processing pulp-derived nanoporous carbon sorbent for the removal of methylene blue, diclofenac, and copper(II)
    (Springer Heidelberg, 2024) Koyuncu, Filiz; Guzel, Fuat; Teymur, Yekbun Avsar
    The present study relates to the physicochemical investigation of the methylene blue, diclofenac, and copper(II) sorptions from the water of the new activated carbon (RPAC) prepared in single-step KOH-activated pyrolysis from red pepper (Capsicum annuum L.) industrial processing pulp (RP) under optimized conditions. Sorption conditions were optimized according to the maximum effects of key factors (RPAC dosage, sorbate concentration, interaction time, and temperature) affecting sorption processes at their natural pH in water. The kinetic and equilibrium experimental sorption data of the examined sorbates were simulated to widely used models and found to fit well with the pseudo-second-order and Langmuir models, respectively. The maximum sorption capacity for methylene blue, diclofenac, and copper(II) by RPAC was found to be 322.6, 303.0, and 196.1 mg g(-1) at their natural pH and 50 degrees C, respectively. Thermodynamic parameters determined for each sorption system indicated that the sorption processes were endothermic and spontaneous. The outputs of the present study highlight that RPAC can be used as an effective sorbent in removing contaminants from water.
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    Role of optimization parameters in the production of nanoporous carbon from mandarin shells by microwave-assisted chemical activation and utilization as dye adsorbent
    (Elsevier Science Bv, 2018) Koyuncu, Filiz; Guzel, Fuat; Saygili, Hasan
    In this study, mandarin (Citrus reticulata) shells (MS) were used as a new precursor material for preparation of nanoporous carbon by chemical activation method with H3PO4 in the presence of microwave radiation. The obtained nanoporous carbon (MNC) was characterized using nitrogen adsorption-desorption isotherms, scanning electron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy and Boehm titration analysis. When using impregnation ratio of 2.0 at 500 degrees C for 1 h, specific surface area of prepared MNC reached the maximum value, which is 1021 m(2)/g. Pore properties of MNC were strongly influenced by impregnation ratio, activation temperature and activation time. For industrial and environmental applications, MNC was tested towards the removal of basic blue 9 (BB9) and acid yellow 36 (AY36) dyes in aqueous media and compared with other carbon adsorbents. The high sorption capacities were 294 mg/g for BB9 and 417 mg/g for AY36. The results indicate that MNC could be regard as a valuable adsorbent to treatment dye pollutants. (C) 2018 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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    Use of a novel bio-magnetic nanocomposite synthesized from industrial tomato processing waste for methylene blue removal: sorption optimization, kinetic and isotherm studies
    (Springer, 2020) Teymur, Yekbun Avsar; Guzel, Fuat; Koyuncu, Filiz; Saygili, Gulbahar Akkaya
    In the current study, the methylene blue (MB) dye sorption performance of a new biomagnetic composite (MTNC) synthesized by modification with Fe(3)O(4)nanoparticles of industrial tomato processing (Lycopersicon esculentumMill.) processing solid waste (TW) was investigated. The XRD, BET, SEM, FT-IR and VSM analysis techniques were used in the characterization of MTNC. The specific surface area, total pore volume, micropore volume, mesopore volume, and mean pore diameter values of MTNC are 28.21 m(2)/g, 0.082 cm(3)/g, 0.003 cm(3)/g, 0.079 and 11.06 nm, respectively. Also, its saturation magnetization value was determined to be 24.80 emu/g. The maximum MB sorption capacity of the MTNC determined to be 90.09 mg/g under optimized conditions of the solution pH of 7.0, WPC dosage of 50 mg, contact time of 180 min, and solution temperature of 50 degrees C. The kinetics and isotherm data were well fitted to the pseudo-second order kinetic and Langmuir isotherm models, respectively. The thermodynamic parameters calculated for the MTNC-MB sorption system proved that the process was spontaneous and endothermic in nature.
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    Öğe
    Use of new nanoporous carbon produced from Mandarin (Citrus reticulata) industrial processing waste to remove anionic and cationic dyes
    (Bellwether Publishing, Ltd., 2021) Koyuncu, Filiz; Güzel, Fuat
    The present study is concerned with the use of a novel nanoporous carbon material (MNC) produced from mandarin (Citrus reticulata) industrial processing waste (MW) for the removal of textile dyes as cationic dye, methylene blue (MB) and anionic dye, metanil yellow (MY), from the aqueous solution. The adsorption mechanisms were examined by SEM and FT-IR analysis. For two dyes, the kinetics was well described by the pseudo-second-order model, whereas the isotherms were all best-fitted by the Langmuir model, and the maximum monolayer adsorption capacity for MB and MY dyes were 313 and 455 mg g−1, respectively.