Adsorption performance and mechanism of Schiff base functionalized polyamidoamine dendrimer/silica for aqueous Mn(Ⅱ) and Co(Ⅱ)  

作　　者：Wenzhu Qiao Peixu Zhang Lixiang Sun Songmei Ma Wenlong Xu Shengguang Xu Yuzhong Niu 

机构地区：[1]School of Chemistry and Materials Science,Ludong University,Yantai 264025,China

出　　处：《Chinese Chemical Letters》2020年第10期2742-2746,共5页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(No.21307053);Natural Science Foundation of Shandong Province(No.ZR2018MB039);Science and Technology Research Program of Yantai(No.2017ZH060)。

摘　　要：Schiff base functionalized polyamidoamine(PAMAM) dendrimer/silica were prepared for the adsorption of aqueous Mn(Ⅱ) and Co(Ⅱ).The effects that influence the adsorption were investigated systematically and the adsorption mechanism was illustrated by theoretical calculation.The optimum adsorption pH are 4 and 6 for Mn(II) and Co(Ⅱ).Adsorption kinetics follow pseudo-second-order model and the ratecontrolling step is film diffusion process.Adsorption isotherm shows that high initial metal ion concentration facilitates the uptake of metal ions.The adsorption capacity increases first and then decreases in the temperature range of 15-35℃.Density functional theory(DFT) calculation demonstrates that Schiff base functionalized PAMAM dendrimer tends to coordinate Mn(Ⅱ) and Co(Ⅱ) with the oxygen atoms of hydroxyl and carbonyl groups,nitrogen of tertiary amine and imino groups.The imino and tertiary amine groups mainly dominate the adsorption.The reproducibility of the adsorbents indicates they can be regenerated by 5% thiourea and 0.5 mol/L HNO_(3) solution efficiently.

关 键 词：ADSORPTION Schiff base PAMAM dendrimer DFT calculation 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]