Adsorption performance and physicochemical mechanism of MnO_(2)-polyethylenimine-tannic acid composites for the removal of Cu(Ⅱ) and Cr(Ⅵ) from aqueous solution

作     者：Xiaoyan Deng Luxing Wang Qihui Xiu Ying Wang Hong Han Dongmei Dai Yongji Xu Hongtao Gao Xien Liu Xiaoyan Deng;Luxing Wang;Qihui Xiu;Ying Wang;Hong Han;Dongmei Dai;Yongji Xu;Hongtao Gao;Xien Liu

作者机构：College of Environment and Safety EngineeringState Key Laboratory Base of Eco-Chemical EngineeringQingdao University of Science&TechnologyQingdao 266042China College of Chemistry and Molecular EngineeringState Key Laboratory Base of Eco-Chemical EngineeringQingdao University of Science&TechnologyQingdao 266042China 

出 版 物：《Frontiers of Chemical Science and Engineering》 (化学科学与工程前沿（英文版）)

年 卷 期：2021年第15卷第3期

页      面：538-551页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41573103,41340037) the Shandong Provincial Key Research and Development Program(Grant Nos.2017GSF16105,2018GGX102004,2018GSF117007) the Taishan Scholar Program(Grant No.ts201712045)of Shandong Province of China 

主　　题：MnO_(2)-polyethylenimine-tannic acid composite surface complexation formation model Cu(Ⅱ) Cr(Ⅵ) physicochemical mechanism 

摘      要：In this work,an adsorbent,which we call MnPT,was prepared by combining MnO_(2),polyethylenimine and tannic acid,and exhibited efficient performance for Cu(Ⅱ) and Cr(VI) removal from aqueous *** oxygen/nitrogen-containing functional groups on the surface of MnPT might increase the enrichment of metal ions by *** maximum adsorption capacities of MnPT for Cu(Ⅱ) and Cr(Ⅵ) were 121.5 and 790.2 mg·g^(-1),*** surface complexation formation model was used to elucidate the physicochemical interplay in the process of Cu(Ⅱ) and Cr(Ⅵ) co-adsorption on *** force,solvation action,adsorbate-adsorbate lateral interaction,and complexation were involved in the spontaneous adsorption *** electrostatic action was dominant in the initial stage,whereas chemical action was the driving force leading to adsorption *** should be noted that after adsorption on the surface of MnPT,Cr(Ⅵ) reacted with some reducing functional groups(hydroxylamine-NH_(2))and was converted into Cr(Ⅲ).The adsorption capacity declined by 12% after recycling five *** the adsorption mechanism might provide a technical basis for the procedural design of heavy metal *** MnPT nanocomposite has been proven to be a low-cost,efficient,and promising adsorbent for removing heavy metal ions from wastewater.