Kinetic, isothermal, and thermodynamic studies of Cr(VI) adsorption on L-tryptophan-containing microspheres
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Date
2014-07
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Mary Ann Liebert, Inc
Abstract
Poly(ethylene glycol dimethacrylate-N-methacryloyl-(L)-tryptophan) [poly(EGDMA-MATrp)] microspheres containing L-tryptophan (average diameter = 106-300 mu m) were synthesized and characterized; their use as adsorbents in removal of Cr(VI) from aqueous solutions was investigated. The poly(EGDMA-MATRP) microspheres were prepared by copolymerizing of ethylene glycol dimethacrylate (EGDMA) with N-methacryloyl-( L)-tryptophan methyl ester (MATrp). The poly(EGDMA-MATrp) microspheres were characterized by N-2 adsorption-desorption isotherms, elemental analysis, scanning electron microscope, and swelling studies. At fixed solid/solution ratio, various factors affecting the adsorption of Cr(VI) ions from aqueous solutions, such as pH, initial concentration, contact time, and temperature, were analyzed. Cr(VI) adsroption kinetic data followed pseudo-second-order kinetics. Experimental isotherms of Cr(VI) ions were successfully fit to both the Langmuir and the Dubinin-Radushkevich isotherm models. Thermodynamic aspects of the adsorption process, such as Gibbs free energy, enthalpy, and entropy changes, were investigated.
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Keywords
Adsorption isotherm, Adsorption kinetic, Adsorption thermodynamic, Cr(vi) ions, L-tryptophan microspheres, Environmental sciences & ecology, Chromium(vi) ions, Engineering, Activated carbon, Chitosan, Aqueous-solution, Acid, Removal, Cu(ii), Equilibrium, Hg(ii), Biosorption
Citation
Kara, A. vd. (2014). "Kinetic, isothermal, and thermodynamic studies of Cr(VI) adsorption on L-tryptophan-containing microspheres". Environmental Engineering Science, 31(6), 261-271.