Macromolecular Research, Vol.23, No.1, 21-29, January, 2015
Facile fabrication of Poly(vinyl alcohol)/Silica composites for removal of Hg(II) from water
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A low-cost and environment friendly route towards the synthesis of poly(vinyl alcohol)/silica composites is presented. The silica-based composites were synthesized by hydrolytic and dehydroxylation polymerization of a silica precursor, tetrakis(2-hydroxyethyl)orthosilicate by sol-gel method within a poly(vinyl alcohol) matrix. Calcination of the composites at 300℃ resulted in mesoporous silica that exhibited excellent Hg(II) adsorption at pH 6.5, and the materials were characterized using FTIR, XRD, TGA-DTA, and SEM analyses. The adsorption data best fitted the Langmuir isotherm; Q max for the adsorbent was 113.63 mg·g-1. The adsorption followed pseudo-second-order kinetics with a rate constant of 6.16×10^(-4) g·mg-1·min-1. The biocompatibility feature of the synthesized adsorbent materials makes it a potential candidate for biological applications such as enzyme immobilization, opto-electronics, and sensors.
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