文献类型：期刊文献

英文题名：Amphoteric starch derivatives as reusable flocculant for heavy-metal removal

作者：Wu, Liang[1];Zhang, Xingrong[2];Chen, Long[1];Zhang, Huan[1];Li, Chengbi[2];Lv, Yin[1];Xu, Yisheng[1,3];Jia, Xin[1];Shi, Yulin[1];Guo, Xuhong[1,3]

机构：[1]Shihezi Univ, Sch Chem & Chem Engn, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Shihezi 832003, Peoples R China;[2]State Key Lab Mineral Proc, Beijing 102628, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：8

期号：3

起止页码：1274

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20180204644234);WOS:【SCI-EXPANDED(收录号:WOS:000419371200015)】；

基金：We are grateful to The Natural Science Foundation of China (21467024, 51764049 and 21661027), The Found of State Key Laboratory of Mineral Processing (BGRIMM-KJSKL-2015-10), China Postdoctoral Science Foundation (2014M561426), The Project-sponsored by Scientific Research Start-up Fund for High- Level Talents, Shihezi University (KX0138), National Training Programs of Innovation and Entrepreneurship for Undergraduates (201710759054), Transformation of Technological Achievements in Shihezi Unviersity (CGZH201715).

语种：英文

外文关键词：Starch - Zinc compounds - Copper compounds - Heavy metals - Metal ions - Ostwald ripening

摘要：A pH-responsive amphoteric starch derivative (PRAS) bearing dual functional groups (amino and carboxyl groups) was prepared through etherification of starch with 2-chloro-4,6-diglycino-[1,3,5]-triazine. PRAS exhibits a reversible pH-response property in aqueous solution. The attractive property of PRAS is that it could be used as an effective flocculant for heavy metal-ion (e.g. Cu(II) and Zn(II)) removal from wastewater by changing pH. The transition of hydrophobicity-hydrophilicity would produce shrinkage of the polymer matrix, facilitating the release of heavy-metal ions from the saturated flocculant. As an ideal flocculant PRAS displayed outstanding stability and reproducibility, whose remove rate for Cu(II) and Zn(II) remained at 93% and 91% after three flocculation/regeneration cycles.