文献类型：期刊文献

英文题名：α-ketoglutaric acid modified chitosan/polyacrylamide semi-interpenetrating polymer network hydrogel for removal of heavy metal ions

作者：Zhao, Zhonghua[1];Huang, Yicheng[1];Wu, Yihao[1];Li, Shuo[1];Yin, Huixian[1];Wang, Jikui[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2021

卷号：628

外文期刊名：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

收录：;EI(收录号：20213310772439);WOS:【SCI-EXPANDED(收录号:WOS:000702827200002)】；

基金：The authors sincerely acknowledge "Shanghai Leading Academic Discipline Project (B502) " and "Shanghai Key Laboratory Project (08DZ2230500) ."

语种：英文

外文关键词：alpha-ketoglutaric acid; Adsorption; Chitosan; Heavy metal ions; Hydrogel

摘要：Chitosan(CTS) has excellent adsorption capacity for heavy metal ions, the combination of chitosan with hydrogels provides a new development direction for chitosan-based adsorbents, and further improvement of adsorption can be achieved by modifying the chitosan on this basis. A semi-interpenetrating polymer network (semi-IPN) hydrogel was successfully synthesized for the removal of heavy metal ions by combining alpha-keto-glutaric acid grafting chitosan (KCTS) with polyacrylamide(PAM) cross-linked by N,N-methylenebis (acrylamide). This semi-IPN hydrogel had the porous structure with high specific surface area, which can expose more active sites and provide an interface for chitosan to fully contact waste water. And it had excellent selective adsorption for Cu(II), Pb(II), and Zn(II) in a mixture of five heavy metal ions. Many influencing factors affecting adsorption have been investigated, such as initial concentration of metal ions, adsorption time, pH of solution, ionic strength, and adsorbent dosage. The adsorption data were simulated well by the pseudo-secondorder kinetic and adsorption isotherms were fitted well Langmuir isotherm model. At 30 degrees C and pH 5.0, the theoretical maximum adsorption capacities of Cu(II), Pb(II), and Zn(II) by KCTS/PAM hydrogel were 72.39, 61.41, and 51.89 mg/g, respectively. After five adsorption-desorption cycles, the adsorption capacity of Cu(II), Pb(II), and Zn(II) still maintained above 90% of initial adsorption capacity. XPS analysis illustrated that the adsorption mechanism of heavy metal ions was mainly due to coordination and ion exchange.