Synthesis of polyhydroxyl-capped PAMAM dendrimer/silica composites for the adsorption of aqueous Hg(II)and Ag(I)  

作　　者：Jiaxuan Wang Tonghe Liu Bingxiang Wang Ziwei Li Yuzhong Niu Hou Chen Ying Zhang 

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

出　　处：《Chinese Chemical Letters》2024年第12期327-333,共7页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.22278201);Youth Innovation Team Development Plan of Universities in Shandong Province,Fundamental Research Projects of Science&Technology Innovation and Development Plan in Yantai City(No.2022JCYJ030);the Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai(No.AMGM2023F09);the Innovation Project for graduate students of Ludong University(IPGS2024-056)。

摘　　要：Water pollution caused by Hg(II)and Ag(I)poses deleterious effects to environmental safety.Adsorption is one of the promising methods to decontaminate aqueous metal ions.Herein,polyhydroxyl-capped poly(amidoamine)(PAMAM)dendrimer/silica composites(G1-OH and G2-OH)were prepared for decontaminating aqueous Hg(II)and Ag(I).The maximum adsorption capacity of G1-OH and G2-OH for Hg(II)are 0.45 and 0.76 mmol/g,while that for Ag(I)are 0.66 and 0.81 mmol/g.The optimum solution pH for the adsorption of Hg(II)and Ag(I)are both 6.The adsorption for Hg(II)and Ag(I)can reach equilibrium at150 and 120 min,respectively.Pseudo-second-order model can be used to describe the adsorption kinetic process and the rate-controlling step is film diffusion process.Adsorption isotherm indicates the adsorption can be promoted by increasing concentration and temperature,and the adsorption process could be described by Langmuir model with chemical mechanism.G1-OH and G2-OH exhibit excellent adsorption selectivity and they can 100%adsorb Hg(II)or Ag(I)with the coexisting of Fe(III),Co(II),Cu(II)or Ni(II).Adsorption mechanism confirms C-N,OH and CONH groups play critical role for the adsorption of the two ions.The work may provide efficient adsorbents for the decontamination of aqueous Hg(II)and Ag(I)with practical value.

关 键 词：Polyhydroxyl-capped PAMAM dendrimer SILICA ADSORPTION Metal ions 

分 类 号：O647.3[理学—物理化学] X703[理学—化学]