Poly(ethylene glycol dimethacrylate-N-methacryloyl-(L)-tryptophan) [poly(EGDMA-MATrp)] microspheres containing L-tryptophan (average diameter=106–300 μm) 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 N2 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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