Biosorption of Silver using Metal-Imprinted Thiourea-Modified Glutaraldehyde-Crosslinked O-Carboxymethyl Chitosan Beads

摘要: Chitosan, an abundant biopolymer obtained from deacetylation of chitin, has been proved to be a promising biosorbent for metal uptake. Grafting new functional groups on the chitosan backbone was also reported efficient in increasing either sorption capacity or selectivity target metal. In this study, silver-imprinted thiourea-modified glutaraldehyde-crosslinked O-carboxymethyl beads were prepared selectively adsorb Ag (I) bimetallic aqueous solution. The synthesized by using first absorb ion, then crosslinking with polymeric Schiff’s base thiourea/glutaraldehyde. To obtain best performance sorbent, degree carboxymethylation substitution, and amount agent used studied. Results indicated highest selective uptake occurred when molar ratio amino group 6:15:16 is synthesis. Batch tests carried out isotherm kinetic studies sorbent which provides (I). All isothermal experiments performed at 25 °C. maximum found 137.5 mgžg -1 pH 5.0 initial concentration being 1.75mmolžL . demonstrated extremely good towards as equal mole Cu (II) present solution scarcely absorbed over range 1.0 6.0. revealed that biosorption process fits well Langmuir model Lagergren’s Pseudo-second-order kinetic.