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Abstract: A hybrid approach for a kind of nanomaterial, ion-imprinted amino-functionalized nano-porous silica (IIAFMS) was studied for water pollution control. IIAFMS samples imprinted with Zn2+, Pb2+, and Cu2+ were directly synthesized under mild alkali condition. During the preparation, tetramethylammonium hydroxide (TMAOH) served as the subsidiary template and nontoxic ethanol provided as an organic solvent. The physical and chemical properties of IIAFMS samples were characterized by FTIR, XPS, CHN elemental analysis, BET, and TEM instruments. Compared with non-imprinted amino-functionalized nano-porous silica (AFMS), IIAFMS revealed a slight increase in amino modification but relatively lower BET surface area and pore volume. Subsequently, selective adsorption of Zn2+, Pb2+, and Cu2+, from binary solutions onto IIAFMS was contrasted with AFMS. The k' (relative selectivity coefficient) values of IIAFMS for Zn2+, Pb2+, and Cu2+ removal ranged from 7.149 to 39.76, which proved that IIAFMS possessed a much higher selectivity for specific metal ions than AFMS. The fitted data of Langmuir isotherm revealed that the adsorption of metal ions onto IIAFMS followed chemical monolayer adsorption. Qmax values of IIAFMS are greater than those of AFMS for typical ions, and the maximum adsorption capacities of Zn2+, Pb2+, and Cu2+ onto relevant IIAFMS had reached 1.077 mmol/g (70.425 mg/g), 1.082 mmol/g (224.190 mg/g), and 1.049 mmol/g (66.660 mg/g), respectively. The kinetic and adsorption-desorption properties of IIAFMS were also discussed using Cu-IIAFMS as an example. Adsorption kinetic data were better fitted by the pseudo-second-order rate equation than the pseudo-first-order one. And IIAFMS possessed a favorable regeneration performance using HNO3 as the eluent. It is a good choice for selective removal of heavy metal ions from water environment
Template and target information: zinc ion, lead ion, copper ion, Zn(II), Pb(II), Cu(II)
Author keywords: amino-functionalized, Heavy metal, Ion-Imprinted Nano-Porous Silica, selective removal, water pollution