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Carboxymethyl cellulose thiol-imprinted polymers:Synthesis, characterization and selective Hg(Ⅱ) adsorption

Journal of Environmental Sciences 2019年第5期31卷 280-296页

作者： tarisai velempini Kriveshini Pillay Xavier Y.MbiANDa Omotayo A.Arotiba Department of Applied Chemistry University of Johannesburg Doornfontein Campus Centre for Nanomaterials University of Johannesburg Doornfontein Campus Department of Science and Technology/National Research Foundation Centre of Excellence in Strong Materials University of the Witwatersrand

Sulfur containing ion imprinted polymers(S-IIPs) were applied for the uptake of Hg(Ⅱ) from aqueous solution. Cysteamine which was used as the ligand for Hg(Ⅱ) complexation, was grafted along the epichlorohydrin crosslinked carboxylated carboxymethyl cellulose polymer chain through an amide reaction. The adsorption ability of S-IIPs towards Hg(Ⅱ)was investigated by kinetic and isotherm models, which, corresponding, showed that the adsorption process followed a pseudo-second-order, fitted well with the Langmuir isotherm with a maximum adsorption capacity of 80 mg/g. Moreover, thermodynamic studies indicated an endothermic and spontaneous reaction with the tendency of an enhanced randomness at the surface of the S-IIPs with temperature increases. S-IIPs indicated a high degree of selectivity towards Hg(Ⅱ) in the presence of Cu^(2+), Zn^(2+), Co^(2+), Pb^(2+)and Cd^(2+).Furthermore, the efficiency of S-IIPs was also evaluated against real samples showing86.78%, 91.88%, and 99.10% recovery for Hg(Ⅱ) wastewater, ground water and tap water,respectively. In this study, the adsorbent was successfully regenerated for five cycles, which allows for their reuse without significant loss of initial adsorption capability.

关键词： Ion-imprinted polymers Carboxymethyl cellulose Adsorption Mercury(Ⅱ) Thiol

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