Carboxymethyl cellulose thiol-imprinted polymers: Synthesis, characterization and selective Hg(II) adsorption.
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.
['Velempini|Tarisai|T|', 'Pillay|Kriveshini|K|', 'Mbianda|Xavier Y|XY|', 'Arotiba|Omotayo A|OA|']
D000327:Adsorption D002266:Carboxymethylcellulose Sodium D003543:Cysteamine D060766:Drinking Water D060587:Groundwater D008628:Mercury D054802:Molecular Imprinting D011108:Polymers D062065:Waste Water D014874:Water Pollutants, Chemical D018508:Water Purification
Carboxymethyl cellulose Adsorption Ion-imprinted polymers Mercury(II) Thiol