Adsorption of aqueous Cu(Ⅱ) and Ag(Ⅰ) by silica anchored Schiff base decorated polyamidoamine dendrimers: Behavior and mechanism  

作　　者：Kaiyan Wu Bingxiang Wang Bentian Tang Liping Luan Wenlong Xu Beibei Zhang Yuzhong Niu 

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

出　　处：《Chinese Chemical Letters》2022年第5期2721-2725,共5页中国化学快报（英文版）

基　　金：Natural Science Foundation of Shandong Province(No.ZR2018MB039)is acknowledged.

摘　　要：A class of silica anchored Schiff base decorated polyamidoamine(PAMAM) dendrimers were synthesized for removing aqueous Cu(Ⅱ) and Ag(Ⅰ). The adsorption performance was investigated synthetically and the adsorption mechanism was revealed. Results indicate the adsorption capacity depends on dendrimer generation, solution p H, contact time, temperature and initial metal ion concentration.The optimum adsorption pH is 6 for both metal ion. Adsorption kinetic suggests the adsorption can achieve equilibrium at 180 and 150 min for Cu(Ⅱ) and Ag(Ⅰ). The kinetic process is found to be in good agreement with pseudo-second-order model and film diffusion is the rate-controlling step. The adsorption isotherm indicates the adsorption is proceeded by monolayer behavior with chemical mechanism. These adsorbents exhibit competitive adsorption capacity as compared with other reported adsorbents. Theoretical calculation demonstrates the participation of hydroxyl, carbonyl, and amide groups during the adsorption of Cu(Ⅱ), while hydroxyl and amide groups are mainly responsible for capturing Ag(Ⅰ).

关 键 词：SILICA PAMAM dendrimers Adsorption mechanism Theoretical calculation 

分 类 号：X703[环境科学与工程—环境工程]