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Synthesis of linear low-density polyethylene-g-poly(acrylic acid)-co-starch/organo-montmorillonite hydrogel composite as an adsorbent for removal of Pb(Ⅱ) from aqueous solutions

查看全文 作　　者：Maryam [1,2]Irani;Hanafi [1]Ismail;Zulkifli [1]Ahmad;Maohong [2]Fan 高影响力作者 机构地区：[1]School of Materials and Mineral Resources Engineering, USM Engineering Campus, Universiti Sains Malaysia;[2]Department of Chemical and Petroleum Engineering, University of Wyoming高影响力机构 出　　处：《Journal of Environmental Sciences》索引2015年第27卷第1期,共12页高影响力期刊 基　　金：supported by the USM short-term grant (Ac No.: 8044043);by the USM fellowship scheme for PhD study (to M. Irani);Water Program at University of Wyoming 摘　　要：The purpose of this work is to remove Pb(II) from the aqueous solution using a type of hydrogel composite. A hydrogel composite consisting of waste linear low density polyethylene, acrylic acid, starch, and organo-montmorillonite was prepared through emulsion polymerization method. Fourier transform infrared spectroscopy(FTIR), Solid carbon nuclear magnetic resonance spectroscopy(CNMR)), silicon-29 nuclear magnetic resonance spectroscopy(Si NMR)), and X-ray diffraction spectroscope((XRD) were applied to characterize the hydrogel composite. The hydrogel composite was then employed as an adsorbent for the removal of Pb(II) from the aqueous solution. The Pb(II)-loaded hydrogel composite was characterized using Fourier transform infrared spectroscopy(FTIR)),scanning electron microscopy(SEM)), and X-ray photoelectron spectroscopy((XPS)). From XPS results, it was found that the carboxyl and hydroxyl groups of the hydrogel composite participated in the removal of Pb(II). Kinetic studies indicated that the adsorption of Pb(II)followed the pseudo-second-order equation. It was also found that the Langmuir model described the adsorption isotherm better than the Freundlich isotherm. The maximum removal capacity of the hydrogel composite for Pb(II) ions was 430 mg/g. Thus, the waste linear low-density polyethylene-g-poly(acrylic acid)-co-starch/organo-montmorillonite hydrogel composite could be a promising Pb(II) adsorbent. 关 键 词：线性低密度聚乙烯 有机蒙脱石 复合物 水凝胶 吸附剂 丙烯酸 水溶液 除铅
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