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Reference type: Journal
Authors: Velempini T, Pillay K, Mbianda XY, Arotiba OA
Article Title: Carboxymethyl cellulose thiol-imprinted polymers: Synthesis, characterization and selective Hg(II) adsorption.
Publication date: 2019
Journal: Journal of Environmental Sciences
Volume: 79
Page numbers: 280-296.
DOI: 10.1016/j.jes.2018.11.022
Alternative URL: https://www.sciencedirect.com/science/article/pii/S1001074218310441

Abstract: 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 Cu2+, Zn2+, Co2+, Pb2+ and Cd2+. Furthermore, the efficiency of S-IIPs was also evaluated against real samples showing 86.78%, 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
Template and target information: mercury ion, Hg(II)
Author keywords: Ion-imprinted polymers, Carboxymethyl cellulose, adsorption, Mercury(II), thiol

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