Abstract
A new resin is prepared by coupling amberlite XAD-4 with salicylic acid through an azo spacer. Then the polymer support was coupled with cystein. The resulting sorbent has been characterized by FT-IR and elemental analysis and studied for adsorption and kinetic behavior of aspartic acid on the modified amberlite XAD-4. The optimum pH value for sorption of the amino acid was 8.5. The sorption capacity was found to be 5.31 mmol g−1 of resin for aspartic acid. The modified resin can be reused for 20 cycles of sorption-desorption without any significant change in sorption capacity. A recovery of 99 % was obtained for the aspartic acid with 0.5 M nitric acid as eluting agent. Adsorption data were modeled using the pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetics equations. The rate constants of pseudo-first-order, pseudo-second-order adsorption and intra-particular diffusion were found 1.68 × 10−2 min−1, 1.14 × 10−5 min−1 mg−1 g and 59.62 mg g−1 min−1/2, respectively.
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