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Fine Chemicals. 2018, (07) Core

Preparation and Adsorption Property of Walnut Shell Grafted PolymerChinese Full TextEnglish Full Text (MT)

YE Qing-ling;CHEN Xiao-qi;TUO Xiao-jun;CHANG Yue;ZHA Fei;College of Chemistry ＆ Chemical Engineering, Northwest Normal University;Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education;Key Laboratory of Polymer Materials of Gansu Province;

Abstract: Two composite materials, walnut shell grafted polyacrylamide and walnut shell grafted poly（methyl methacrylate） were prepared via activators generated by electron transfer for atom transfer radical polymerization（AGET ATRP） by using walnut shell macroinitiator as initiator in a catalytic system of Fe Cl3·6 H2 O/PPh3 and Vc, in which walnut shell macroinitiator was prepared with walnut shell and 2-bromoisobutyryl bromide. The structure and morphology of composite materials were characterized by FTIR, TG and SEM. The results indicated that the adsorption capability of Pb（Ⅱ） and Cu（Ⅱ） from aqueous solution by both walnut shell grafted polyacrylamide and walnut shell grafted poly（methyl methacrylate） was higher than that of walnut shell. The maximum adsorption capacity was 40.5 mg/g and 48.5 mg/g, respectively, at 293 K and pH 5 when initial Pb（Ⅱ） concentration was 50 mg/L. Kinetic and isotherm studies of Pb（II） revealed that adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm equation. After 4 times of regeneration, the minimum desorption rate of Pb（Ⅱ） by walnut shell grafted polyacrylamide and walnut shell grafted poly（methyl methacrylate） was 93.4% and 93.1%, respectively, indicating that the composite materials had better regeneration capacity.
Keywords：

walnut shell; atom transfer radical polymerization; composite materials; adsorption; water treatment;

  • DOI：

    10.13550/j.jxhg.20170631

  • Series：

  • Subject：

  • Classification Code：

    O647.33;X703

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