a chelating polymer resin: synthesis, characterization, adsorption and desorption performance for removal of hg(ii) from aqueous solution

A chloromethylated polystyrene-n-methyl thiourea chelating resin (dmtur) was successfully prepared by the reaction of chloromethylated polystyrene beads (ps-cl) with n-methyl thiourea (dmtu). the dmtur exhibited a high selective adsorption toward hg(ii) in the mixture of different metal ions containing cu(ii), hg(ii), cd(ii), pb(ii), cr(iii) and ni(ii), and the adsorption capacity of hg(ii) approached a maximum with a value of 347 mg/g at ph = 4.0. moreover, the batch kinetic study showed that the adsorption behavior of hg(ii) presented as a pseudo-second-order manner. and the adsorption isotherms fitted well with langmuir model, and the maximum uptake of hg(ii) could reach to be 476 mg g−1 at 35 °c. the thermodynamics study ensured the adsorption process essentially as favorable and endothermic. finally, an eluent of 4 m hno3 solution could completely remove the adsorbed hg(ii) and the adsorption capacity allowed a high level at least five cycles. as aforementioned appealing properties, the dmtur with simple technology, high adsorption capacity, significant selectivity and good regenerability have a potential application in industrial scale as a treatment of enriched hg(ii) in wastewater.