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. Q
max 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.
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Ion-Imprinted Nano-Porous Silica;
Document Type: Research Article
College of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
Department of Aviation Ammunition, Airforce Logistics College, Xuzhou, Jiangsu 221116, P. R. China
School of Geodesy and Geomatics Engineering, Huaihai Institute of Technology, Lianyungang 222005, P. R. China
Publication date: September 1, 2017
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