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    Acid dyes removal using low cost adsorbents
    (Inderscience Enterprises Ltd, 2004) Aydin, AH; Bulut, Y; Yavuz, Ö
    Dyestuff production units and dyeing units have always had pressing need techniques that allow economical pre-treatment for colour in the effluent. The effectiveness of adsorption for dye removal from wastewaters has made it an ideal alternative to other expensive treatment options. Removal of acid green 25 and acid red 183 from aqueous solution by different adsorbent such as shells of almond and hazelnut, and poplar and walnut sawdust were investigated. Equilibrium isotherms have been determined and analysed using the Freundlich equations. Parameters of Freundlich isotherm have been determined using adsorption data. Capacities of adsorbent follow as walnut > poplar > almond > hazelnut for AG25 and almond > walnut > poplar > hazelnut for AR183, respectively.
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    Content of some trace metals in honey from south-eastern Anatolia
    (Elsevier Sci Ltd, 1999) Yilmaz, H; Yavuz, Ö
    Contents of Na, K, Ca, Mg, Cu, Fe, Mn, Zn and Co in honey (30 samples) from different parts of south-eastern Anatolia (Turkey) were determined by atomic absorption spectrometer AAS. The mean values for Na, K, Ca, Mg, Cu, Fe, Mn, Zn and Co were 118, 296, 51, 33, 1.8, 6.6, 1.0, 2.7 and 1.0 mg/kg, respectively. Also determined in the honey samples were invert sugar, sucrose, hydroxymethyifurfural, diastase activity, free acid, lactone, pH, ash, proline and moisture. In south-eastern Anatolia the honeys were found to have low ash contents, and some high mineral contents. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
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    Level of heavy metals in some edible and poisonous macrofungi from Batman of South East Anatolia, Turkey
    (Triveni Enterprises, 2004) Yesil, ÖF; Yildiz, A; Yavuz, Ö
    The macrofungi specimens were collected and identified from locations around Batman province of Turkey. A group of 21 macrofungi were collected from 29 different locations and analysed for the heavy metal contents. The highest Pb and Cu levels were found in Russula rubroalba while the highest Cd level was determined for the species Agaricus xanthodermus. Fe level was maximum for the species Funalia trogii; Mn for Mycena personsii; Zn level was for Morchella esculenta and Co level was for the species Agaricus xanthodermus. The lowest Cd, Cu, Mn and Zn contents were found in Inotus hispidus.
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    Level of heavy metals in some edible and poisonous macrofungi of Diyarbakir region in Turkey
    (Springer, 2004) Yesil, ÖF; Yildiz, A; Yavuz, Ö
    [Abstract Not Available]
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    Organic elements and protein in some macrofungi of south east Anatolia in Turkey
    (Elsevier Sci Ltd, 2005) Yildiz, A; Yesil, MF; Yavuz, Ö; Karakaplan, M
    The macrofungi specimens were collected from locations around Diyarbakir and Batman. Thirty five species of macrofungi were identified as belonging to 15 families in Diyarbakir and Batman provinces. Protein contents of Boletus luteus, Armillaria tabescens, Helvella sp., Agaricus bisporus, Agrocybe aegerita and Tricholoma ustale were 8.2-18.1, 7.2-10.6, 2.15-27.7, 26.5-51.2, 41.0-46.8, and 29.7-50.5 (% dry weight), respectively. The highest protein concentrations (% dry weight) were found to be in Agaricus bisporus (51.2) which was collected at the Campus of Dicle University and T ustale (50.5) at the Gercus district in Yolagzi village. In conclusion, protein contents, and organic elements were found to be changeable according to growth region and species. (C) 2004 Elsevier Ltd. All rights reserved.
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    Preparation of new o-carboxyanilinotellurium(IV) bromides and their dyeing properties
    (Marcel Dekker Inc, 2001) Topal, G; Temel, H; Yavuz, Ö; Coskun, M; Sekerci, M
    This study represents a new synthesis of two organotellurium compounds and their dyeing properties. The structure of these tellurium derivatives are proposed based on elemental analyses, IR, UV-Vis, H-1 and C-13 NMR spectra and thermogravimetric analyses (TGA).
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    Recovery of gold and silver from copper anode slime
    (Taylor & Francis Inc, 2000) Yavuz, Ö; Ziyadanogullari, R
    This study has shown that gold and silver can be recovered from a complex anode slime containing copper, selenium, and tellurium, but a carefully planned leaching procedure is required. To extract the gold with thiourea, it is necessary to first remove the copper, selenium, tellurium, and most of the silver from the mixture. Once these elements are removed, the gold and most of the remaining silver can be extracted in high yields by leaching with thiourea solutions. It is possible to collect the gold and silver (as well as copper, selenium, and tellurium) in separate phases where they can be purified more easily. No additional step is necessary to separate the silver and gold from each other.
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    The removal of acid dye from aqueous solution by different adsorbents
    (Parlar Scientific Publications (P S P), 2002) Yavuz, Ö; Aydin, AH
    Colour removal is an important task in textile wastewater treatment. Removal of dyestuff from aqueous solutions by different adsorbents, such as activated carbon, kaolinite and montmorillonite was investigated. Equilibrium isotherms have been determined and analysed using the Langmuir equations. The monolayer saturation adsorption capacities for acid dye are 967.0, 50.5, 43.7 and 31.3 mg/g adsorbent for RAC (a commercial activated carbon), HAC (activated carbon obtained from hazelnut), KC (raw kaolinite) and MC (montmorillonite) at 25 degreesC, respectively.
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    Removal of acid red 183 from aqueous solution using clay and activated carbon
    (Natl Inst Science Communication-Niscair, 2004) Aydin, AH; Yavuz, Ö
    The removal of acid red 183 from aqueous solution onto activated carbon, raw kaolinite and montmorillonite has been studied using an agitated batch adsorber. The adsorption isotherm data were fitted to Langmuir isotherm. Parameters of Langmuir isotherm were determined using adsorption data. The adsorption capacity was 1495, 111, 29 and 19 mg dye per g adsorbent for RAC (commercial activated carbon), HAC (activated carbon obtained from hazelnut), KC (raw kaolinite) and MC (montmorillonite) at 25degreesC respectively.
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    Removal of cadmium from aqueous solution by natural and thermally activated dolomite
    (Inst Lebensmitteltechnologie Analytische Chemie, 2002) Yavuz, Ö; Ziyadanogullari, B; Aydin, I; Bingöl, H
    Removal of Cd(II) from aqueous solution by natural and thermally activated dolomite was investigated. Maximum activation temperature and maximum adsorption capacities were determined as 700 degreesC for 2 hours and 1.02 mg g(-1) for natural dolomite, but 64.93 mg g(-1) for thermally activated dolomite at 25 degreesC, respectively. Equilibrium contact time of cadmium was determined as 1 hour. Adsorption of Cd(II) on dolomite conforms to Langmuir's isotherm.
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    Removal of cadmium from aqueous solution by natural and thermally activated kaolinite
    (Parlar Scientific Publications (P S P), 2002) Yavuz, Ö; Aslan, H
    Removal of Cd(II) from aqueous solution and effect of activation temperature on the adsorption by kaolinite was investigated. Maximum activation temperature was determined as 600 degreesC for 1 hour and maximum adsorption capacities for natural kaolinite as 0.835 mg g(-1) at 5 degreesC and 1.117 mg g(-1) at 40 degreesC, for thermally activated kaolinite as 6.75 mg g(-1) at 25 degreesC and 7.518 mg g(-1) at 40 degreesC, respectively. Equilibrium contact time of cadmium was determined to be I hour. Adsorption of Cd(H) on kaolinite conforms to Langmuir's isotherm.
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    Removal of copper, nickel, cobalt and manganese from aqueous solution by kaolinite
    (Pergamon-Elsevier Science Ltd, 2003) Yavuz, Ö; Altunkaynak, Y; Güzel, F
    The removal of some heavy metals such as Mn(II), Co(II), Ni(II), and Cu(II) from aqueous solution is studied using a raw kaolinite. The sorption of these metals on kaolinite conformed to linear form of Langmuir adsorption equation. Langmuir C-m constants for each metal were found as 0.446 mg/g (Mn), 0.919 mg/g (Co), 1.669 mg/g (Ni), 10,787 mg/g (Cu) at 25degreesC, respectively. Also, kinetic and thermodynamic parameters such as enthalpy (DeltaH), free energy (DeltaG) and entropy (DeltaS) were calculated and these values show that adsorption of heavy metal on kaolinite was an endothermic process and the process of adsorption was favoured at high temperatures. (C) 2002 Elsevier Science Ltd. All rights reserved.
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    Removal of direct dyes from aqueous solution using various adsorbents
    (Hard, 2006) Yavuz, Ö; Aydin, AH
    Dyestuff production units and dyeing units have always had a pressing need for techniques that allow economical pre-treatment for colour in the effluent. The effectiveness of adsorption for dye removal from wastewaters has made it an ideal alternative to other expensive treatment options. Removal of direct dyes [direct yellow 50 (DY50), direct red 80 (DR80) and direct blue 71(DB71)] from an aqueous solution by different adsorbents such as activated carbon, raw kaolinite and montmorillonite was investigated. The adsorption isotherm data were fitted to the Langmuir isotherm. Parameters of the Langmuir isotherm have been determined using the adsorption data. Adsorption capacity of RAC (commercial activated carbon), HAC (activated carbon obtained from shell of hazelnut), KC ( raw kaolinite) and MC (montmorillonite) increased in the following order: DY50 > DR80 > DB71, DB71 > DR80 > DY50, DR80 > DB71 > DY50 and DB71 > DR80 (DY50 showed no absorption) for the direct dyes, respectively.