Abstract
A green and simple glow-discharge electrolysis plasma (GDEP) technique was used to synthesize the chitosan/attapulgite/poly(acrylic acid-co-2-acrylamido-2-methyl-1-propanesulfonic acid) (CS/ATP/P(AA-co-AMPS)) microporous polymer. The results showed that the optimum pH for the adsorption of PbSUP2+/SUP, CdSUP2+/SUP, CoSUP2+/SUP, and CuSUP2+/SUP is 4.8, and time of adsorption equilibrium is 60 min. Adsorption kinetics fits well to the pseudo-second-order model. The maximum adsorption capacities for PbSUP2+/SUP, CdSUP2+/SUP, CuSUP2+/SUP and CoSUP2+/SUP are 500.0, 301.7, 180.0 and 151.7 mg gSUP-1/SUP, respectively. The microporous polymer has higher adsorption selectivity toward PbSUP2+/SUP with the coexistence of CdSUP2+/SUP, CoSUP2+/SUP, and CuSUP2+/SUP. The CS/ATP/P(AAco-AMPS) possesses promising regeneration and reusability using 2.0 g L–1 ethylenediamine tetraacetic acid tetrasodium salt (EDTA-4Na) solution as eluent. CS/ATP/P(AA-co-AMPS) can be used as a very promising absorbent for the separation purification and selective recovery of PbSUP2+/SUP in aqueous solution containing CdSUP2+/SUP, CoSUP2+/SUP, and CuSUP2+/SUP ions.
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