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Öğe Cevherden flotasyon yöntemiyle baritin zenginleştirilmesi(Dicle Üniversitesi Mühendislik Fakültesi, 2023) Dolak, İbrahim; Keçili, RüstemBu çalışmada, Eskişehir ili sınırları içerisinde bulunan ve ülkemiz açısından ekonomik değeri oldukça yüksek olan bastnasit cevherinde bulunan Barit (BaSO4) mineralinin flotasyon tekniği ile seçici olarak cevherden ayırımı ve yüksek saflıkta barit elde edilmesi amaçlanmıştır. İlgili bölgeden tekniğe uygun olarak alınan cevher numunesi kırıtıcı-öğütücü yardımı ile öğütülmüş ve uygun tanecik boyutuna getirilmiştir. Uygun tanecik boyutundaki cevher numunesine eleme işlemi uygulanmış ve bu sayede uygun tanecik boyutlu ve homojenize edilmiş numune elde edilmiştir. Homojenize edilmiş numune içerisinde bulunan mineral analizi için uygun çözünürleştirilme işlemi yapıldıktan sonra analizler yapılmış, cevher bünyesinde bulunan, bastnasit, barit ve fluorit gibi minerallerin numune içerisindeki miktarları tespit edilmiştir. Ön flotasyon işlemleri ile baritin flotasyon verimleri incelenmiş ancak istenilen düzeyde zenginleştirilme yapılamamıştır. Flotasyon veriminin düşük olmasının cevherin minerolojik yapısından kaynaklandığı düşünülmüş ve cevherin kristal yapısını değiştirmek amacıyla flotasyon işleminden önce sülfürleme prosesi gerçekleştirilmiştir. Sülfürleme prosesinden sona gerçekleştirilen flotasyon çalışmalarında baritin flotasyon veriminde ciddi oranda artış olduğu yapılan deneyler sonucunda görülmüştür. Tespit edilen optimum flotasyon koşullarında yapılan deneylerde cevher bünyesinde yer alan baritin % 92.04 flotasyon verimi ile cevherdeki tenörürünün % 31,13’den % 91.14’e yükseldiği tespit edilmiştir.Öğe Conductive polymer-based nanocomposites as powerful sorbents: Design, preparation and extraction applications(Taylor & Francis, 2022) Canpolat, Gurbet; Dolak, İbrahim; Keçili, Rüstem; Hussain, Chaudhery Ghazanfar; Amiri, Amirhassan; Hussain, Chaudhery MustansarConductive polymers as composite materials have been attracted tremendous attention due to their versatile and excellent features such as tunable conductivity, facile synthesis and fabrication, high chemical and thermal stability etc. These characteristics make them versatile and let them being used in numerous fields including microelectronics, optics and biosensors. Throughout the mentioned fields, conductive polymers particularly perform as effective sorbents. Although tremendous efforts have been put into this topic, to the best of our knowledge, a comprehensive up-to-date review on the applications of conductive polymers as efficient sorbents has not been reported. The main objective of this paper is to make a significant contribution to the recent literature toward the synthesis and extraction applications of conductive polymers as efficient sorbents.Öğe Era of nano-lab-on-a-chip (LOC) technology(Elsevier, 2020) Keçili, Rüstem; Ghorbani-Bidkorpeh, Fatemeh; Dolak, İbrahim; Hussain, Chaudhery Mustansar; 0000-0001-6810-2087; 0000-0002-1964-4338; 0000-0002-2095-7614Lab-on-a-chip (LOC) technology can be successfully applied to the design and fabrication of novel miniaturized systems for the sensitive recognition of target compound/s with very low sample requirements and a small footprint, in a low-cost and automated way and for on-site analysis. Synthetic chemistry can also take advantage of the superiorities of LOC technology. Increased heat and mass transfer, as well as parallelization capabilities, can give researchers a new paradigm. © 2020 Elsevier Inc. All rights reserved.Öğe Eskişehir bastnasit cevherinde bulunan lantanın zenginleştirilmesi(Dicle Üniversitesi Mühendislik Fakültesi, 2022) Dolak, İbrahim; Keçili, RüstemBu çalışmada, Eskişehir Sivrihisar’da yer alan ve ülkemize ekonomik getiri açısından çok önemli bir yere sahip bastnasit cevherindeki lantan elementinin flotasyon tekniği ile seçici olarak cevherden ayırımı gerçekleştirildikten sonra çözelti ortamında zenginleştirilmesi amaçlanmıştır. Gerçekleştirilen çalışmanın ilk kısmında bastnasite bileşen analizi uygulanmış ve içeriğinde yer alan seryum, toryum ve lantan gibi nadir toprak elementlerinin miktarları belirlenmiştir. bastnasit cevherindeki lantan flotasyon tekniği ile kompleks cevher ayrılarak zenginleştirilmiştir. Gerçekleştirilen çalışmanın en önemli kısmı ise flotasyondan önce bastnasitin kristal yapısı değiştirilerek belirli bir tanecik boyutunda serbestleşme derecesi sağlanması ve daha sonra numunenin flotasyon tekniği ile lantanın etkili bir şekilde ve yüksek verimle ayrılmasıdır. Diğer taraftan, sülfürleme işlemi cevherin kristal yapısının değiştirilerek belirli bir boyutta serbestleşme derecesini arttırmak için yapılmıştır. Bunun için, gerçekleştirilen deneysel çalışmalarda sülfürleme prosesine ortam sıcaklığı, zaman ve uygulanan H2S derişiminin etkisi, flotasyon verimine ise ortam pH’ı, pülp yoğunluğu, toplayıcı miktarı ve canlandırıcı-bastırıcı reaktiflerin etkisi araştırılmıştır. Elde edilen sonuçlara göre, optimum koşullarda bastnasitin içeriğinde yer alan lantanın flotasyon verimi %95’tir. Aynı zamanda, elde edilen konsantrede lantan tenörü % 1,13’den % 11,03’lere kadar değiştiği belirlenmiştir.Öğe Functionalized magnetic nanoparticles as powerful sorbents and stationary phases for the extraction and chromatographic applications(Elsevier SCI LTD., 2021) Keçili, Rüstem; Ghorbani-Bidkorbeh, Fatemeh; Dolak, İbrahim; Canpolat, Gurbet; Karabörk, Muharrem; Hussain, Chaudhery MustansarMaterials in nanodimensions such as magnetic nanoparticles exibit fascinating physico-chemical features (i.e. high surface area, very small size, superparamagnetism, active surface which can be successfully functionalized, low toxicity, etc). Because of these superior features, functionalized magnetic nanoparticles received increasing attention for tremendous amount of studies over the last years and a number of successful applications were published. This paper aims to present and highlight the latest progresses in the development of novel functionalized magnetic nanoparticles for the extraction and chromatographic applications. (C) 2021 Elsevier B.V. All rights reserved.Öğe Green nanomaterials in sample pre-treatment processes(Elsevier B.V., 2024) Canpolat, Gurbet; Dolak, İbrahim; Keçili, Rüstem; Hussain, Chaudhery Mustansar; 0000-0002-1964-4338; 0000-0002-2095-7614Extraction is an important step in sample pre-treatment processes for the efficient removal of an analyte of interest from a complex matrix. Removal of harmful pollutants from contaminated food, environmental, and biological samples is a crucial demand. Green extraction techniques have been developed as greener and more sustainable alternatives to traditional sample preparation methods. These techniques aim to improve the selectivity and sensitivity of analytical methods and simultaneously reducing the harmful side effects of conventional extraction techniques. Green nanomaterials have advanced extraction technologies due to their unique physicochemical features and facile surface functionalization. This chapter presents the synthesis of green nanomaterials and their use in analytical applications, with a special focus on their roles as sorbent materials.Öğe Sample preparation with conductive polymers(American Chemical Society, 2022) Canpolat, Gurbet; Dolak, İbrahim; Hussain, Chaudhery Ghazanfar; Keçili, Rüstem; Hussain, Chaudhery Mustansar; 0000-0001-5556-6368; 0000-0002-1964-4338This chapter presents and highlights the latest progress in the synthesis andapplications of conductive polymers and their nanocomposites as powerfulsorbents in different sample preparation techniques including solid-phaseextraction, solid-phase microextraction, dispersive solid-phase extraction, andmagnetic solid-phase extraction. The review covers the extraction of heavy metalsand organic analytes from various food, environmental, and biological samplessuch as water, urine, and blood. In addition, electrochemical electrodes based onCPs and their composites are also summarized.Öğe Selective recognition and separation of ubiquitin by nanoparticle embedded cryogel traps with ubiquitin memories based on photosensitive covalent imprinting(Pleiades Publishing INC., 2021) Dolak, İbrahim; Keçili, Rüstem; Yılmaz, Filiz; Ersöz, Arzu; Say, RıdvanRecognition and determination of ubiquitin (Ubq) is very important since it affects the enzymatic mechanisms, which causes damages in the living organisms. This can lead to diseases especially in neuronal system. Molecularly imprinted polymers (MIPs) are selective resins that exhibit high affinity toward target compounds. MIPs have attracted significicant research interest because of their various applications in solid phase extraction, biosensors and drug delivery, etc. Various MIP types can be used such as thermo-sensitive, pH-sensitive, biomolecule-sensitive, ion-sensitive and photo-sensitive in these applications. Photosensitive MIPs can be used to increase the selectivity and binding efficiency to decrease denaturation of target biomolecules. The aim of this study is to prepare photosensitive cross-linked p(Ubq-co-MACys-Ru(bipyr)(2)-MACys) polymeric nanoparticles (UbqINPs) and leach with 0.5 M HCl to create Ubq memories onto nanoparticles (UbqINPs) and optimize their binding parameters in cryogel based column system. For this purpose, different factors such as pH, flow rate, ionic strength and temperature were investigated, and maximum ubiquitin binding capacity was found to be 25 mg/g at pH 7. The results showed that the UbqINPs can be considered as a good binding material for recognition and separation of Ubq.Öğe Smartphone-based optical and electrochemical sensing(Elsevier, 2021) Keçili, Rüstem; Ghorbani-Bidkorbeh, Fatemeh; Dolak, İbrahim; Canpolat, Gurbet; Hussain, Chaudhery Mustansar; 0000-0002-2095-7614; 0000-0001-6810-2087; 0000-0002-1964-4338Smartphones are emerging as potential replacements for the instrumentation involved in performing various sensing applications such as fast diagnostic tests. This is fueled in part by the gradual increase of billions of smartphone users (~ 3.5 billion users in 2020) even in low-income countries. In this chapter, the latest advancements on the design, development and successful applications of smartphone-based optical (colorimetric, fluorescence, chemiluminescence etc.) and electrochemical sensor platforms was highlighted and overviewed. It starts with the sifnigifance and superior features of the smartphones in the introduction part. In the next sections, optical sensing and electrochemical sensing based on smartphone technology and various important examples from the literature are demonstrated.Öğe Smartphone: A new perspective in analysis(Elsevier, 2021) Hussain, Chaudhery Mustansar; Dolak, İbrahim; Ghorbani-Bidkorbeh, Fatemeh; Keçili, Rüstem; 0000-0002-1964-4338; 0000-0001-6810-2087The emergence of the smartphone technology led to so many changes in everyone’s life from communicating each other to online shopping and entertainment and studying etc. On the other hand, this technology also provided new opportunities and applications in different fields of science. This chapter presents an overview of the design, fabrication and applications of smartphone-based sensor systems. The chapter starts with the history and importance of the smartphone technology. Then, various interesting and of successful applications of smartphone-based sensor systems (i.e. smartphone-based colorimetric sensors, smartphone-based luminescence & fluorescence sensors and smartphone-based spectrometers) are presented.
