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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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    Enantioselective transport of amino acids as their potassium and sodium salts by optically active diaza-18-crown-6 ethers having arene sidearms
    (Pergamon-Elsevier Science Ltd, 2004) Demirel, N; Bulut, Y; Hosgören, H
    The enantioselective transport of amino acids as their sodium and potassium salts has been investigated by optically active diaza crown ethers. The reversed enantioselectivity of chiral crown ether 1 was observed. (C) 2004 Elsevier Ltd. All rights reserved.
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    Removal of heavy metal ions by modified sawdust of walnut
    (Parlar Scientific Publications (P S P), 2003) Bulut, Y; Tez, Z
    Modified walnut sawdust was found to be effective in removing Ni(II), Cd(II) and Pb(II) from aqueous solution. The extent of removal depends on the contact time, concentration and temperature of the solution. The equilibrium time was found to be about 60 min. The adsorption rate constants were calculated by kinetics which fit a pseudo first-order and second-order laws. Experiments were carried out at three different temperatures, expressed as both Freundlich and Langmuir isotherms, and Freundlich and Langmuir constants as well as the thermodynamic parameters DeltaG, DeltaH and DeltaS were calculated. A possible explanation for the adsorption of metal ions by the sawdust may be attributed to the exchange between metal ions and acidic protons in sawdust matter.
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    Removal of Pb(II) from wastewater using wheat bran
    (Academic Press Ltd- Elsevier Science Ltd, 2006) Bulut, Y; Baysal, Z
    The adsorption of Pb(II) ions from aqueous solutions on wheat bran (WB) has been investigated as a function of initial concentration, adsorbent dose, adsorbent particle size, agitation speed, temperature, contact time and pH of solution. The equilibrium process was described well by the Langmuir isotherm model with maximum sorption capacities of 69.0, 80.7 and 87.0 mg g(-1) of Pb(11) on wheat bran at 20, 40 and 60 degrees C, respectively. Thermodynamic parameters, i.e. Delta G degrees, Delta H degrees and Delta S degrees have also been calculated for the system and the sorption process was found to be endothermic. Good correlation coefficients were obtained for the pseudo second-order kinetic model. The metal ion could be stripped by addition of 0.5 M HCl, making the adsorbent regeneration and its reutilization possible. (c) 2005 Elsevier Ltd. All rights reserved.
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    Synthesis of chiral diaza 18-crown-6 ethers from chiral amines and molecular recognition of potassium and sodium salts of amino acids
    (Pergamon-Elsevier Science Ltd, 2003) Demirel, N; Bulut, Y
    A practical synthesis of chiral amine precursors 3 and 4 and chiral diaza 18-crown-6 ethers 5. 6 and 7 starting from chiral amines are reported. The molecular recognition of these chiral crown ethers for amino acids potassium and sodium salts has been characterized by UV-vis. The selectivity order is Phe>Thr>Ala. In the case of 6 the cavity of the macrocycle plays ail important role in recognition. (C) 2003 Elsevier Ltd. All rights reserved.
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