文献类型：期刊文献

英文题名：Removing Cr(VI) from Aqueous Solutions via Absorption by Green Synthesized PGA-PL-tannin Gel

作者：Yin, Haisong[1,2];Li, Guangming[1];Qiao, Xin[3];Zhao, Tingbin[4];Sun, Aiyou[5];Qiao, Changsheng[1,4,6]

机构：[1]Tianjin Univ Sci & Technol, Tianjin Engn Res Ctr Microbial Metab & Fermentat, Coll Biotechnol, Tianjin, Peoples R China;[2]Tianjin Modern Vocat Technol Coll, Sch Bioengn, Tianjin, Peoples R China;[3]Jiangnan Univ, Sch Biotechnol, Wuxi, Jiangsu, Peoples R China;[4]Tianjin Huizhi Biotrans Bioengn Co, Tianjin, Peoples R China;[5]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai, Peoples R China;[6]Minist Educ, Engn Res Ctr Food Biotechnol, Tianjin, Peoples R China

年份：2020

卷号：29

期号：2

起止页码：1973

外文期刊名：POLISH JOURNAL OF ENVIRONMENTAL STUDIES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000513486600042)】；

基金：This work was supported by the Foundation of Tianjin Municipal Science and Technology Commission (Nos. 17PTGCCX00190, 17PTSYJC00080, 17YFCZZC00310, and 16YFXTSF00460), the Foundation of Tianjin Engineering Research Center of Microbial Metabolism and Fermentation Process Control, PR China (No. ZXKF20180301), and the Foundation of Engineering Research Center of Food Biotechnology, Ministry of Education, PR China (No. SPZX10-18).

语种：英文

外文关键词：PGA-PL-tannin; Cr(VI); adsorption; thermodynamics; equilibrium

摘要：Hexavalent chromium Cr(VI) has been proven to be harmful to human health and the environment. Polyglutamic acid (gamma-PGA), polylysine (epsilon-PL), and tannin can be designed to make a gel (PGA-PL-tannin) that can efficiently remove Cr(VI). In this study, the mechanism of Cr( VI) adsorption by PGA-PL-tannin gel was investigated. The results showed that the rate of Cr(VI) removal by this gel exceeded 90% at pH 6-9. A thermodynamic study of the parameters of Cr(VI) adsorption by PGA-PL-tannin gel indicated that the process conformed to the Freundlich isothermal adsorption and pseudo second-order adsorption dynamics models, and was a spontaneous and endothermic process. Owing to the interaction between charged functional groups, Cr(VI) was reduced to trivalent chromium [Cr(III)] after adsorption to the PGA-PL-tannin gel surface. This study demonstrates that PGA-PL-tannin gel could be used as an adsorbent for Cr(VI) pollution control.