Insight into the adsorption of tetracycline onto amino and amino–Fe^(3+) gunctionalized mesoporous silica: Effect of functionalized groups  

作　　者：Ziyang Zhang Haiyan Li Huijuan Liu 

机构地区：[1]Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture [2]Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences

出　　处：《Journal of Environmental Sciences》2018年第3期171-178,共8页环境科学学报（英文版）

基　　金：supported by Beijing Postdoctoral Science Foundation (No. 21009916007);Beijing Outstanding Talent Project for Excellent Youth Team (No. 2015000026833T0000);the National Science Fund for Distinguished Young Scholars of China (No. 51225805);Natural Science Foundation of China (No. 51678025)

摘　　要：In order to study the influences of functionalized groups onto the adsorption of tetracycline,we prepared a series of amino and amino–Fe^（3＋）complex mesoporous silica adsorbents with diverse content of amino and Fe^（3＋）groups（named N,N-SBA15 and Fe-N,N-SBA15）.The resulting mesoporous silica adsorbents were fully characterized by X-ray powder diffraction（XRD）,Fourier transform infrared spectrometer（FTIR）and N2adsorption/desorption isotherms.Furthermore,the effects of functionalized groups on the removal of TC were investigated.The results showed that the periodic ordered structure of SBA-15 was maintained after modification of amino/Fe^（3＋）groups.The functionalized amino groups decreased the adsorption capacity while the coordinated Fe^（3＋）increased the adsorption capacity.The adsorption kinetics of TC fitted pseudo-second-order model well and the equilibrium was achieved quickly.The adsorption isotherms fitted the Langmuir model well and with the Fe^（3＋）content increased from 3.93%to 8.26%,the Q（max）of the adsorbents increased from 102 to 188 mmol/kg.The solution p H affected the adsorption of TC onto amino complex adsorbents slightly while influenced the adsorption onto Fe-amine complex adsorbents greatly.The adsorption of TC on SBA15 and N,N-SBA15 may be related to the formation of outer-sphere surface complexes,while the adsorption of TC onto Fe-N,N-SBA15 was mainly attributed to the inner-sphere surface complexes.This study could offer potential materials that have excellent adsorption behavior for environmental remediation and suggested useful information for the preparing other adsorbents in environmental applications.In order to study the influences of functionalized groups onto the adsorption of tetracycline,we prepared a series of amino and amino–Fe^（3＋）complex mesoporous silica adsorbents with diverse content of amino and Fe^（3＋）groups（named N,N-SBA15 and Fe-N,N-SBA15）.The resulting mesoporous silica adsorbents were fully characterized by X-ray powder diffraction（XRD）,Fourier transform infrared spectrometer（FTIR）and N2adsorption/desorption isotherms.Furthermore,the effects of functionalized groups on the removal of TC were investigated.The results showed that the periodic ordered structure of SBA-15 was maintained after modification of amino/Fe^（3＋）groups.The functionalized amino groups decreased the adsorption capacity while the coordinated Fe^（3＋）increased the adsorption capacity.The adsorption kinetics of TC fitted pseudo-second-order model well and the equilibrium was achieved quickly.The adsorption isotherms fitted the Langmuir model well and with the Fe^（3＋）content increased from 3.93%to 8.26%,the Q（max）of the adsorbents increased from 102 to 188 mmol/kg.The solution p H affected the adsorption of TC onto amino complex adsorbents slightly while influenced the adsorption onto Fe-amine complex adsorbents greatly.The adsorption of TC on SBA15 and N,N-SBA15 may be related to the formation of outer-sphere surface complexes,while the adsorption of TC onto Fe-N,N-SBA15 was mainly attributed to the inner-sphere surface complexes.This study could offer potential materials that have excellent adsorption behavior for environmental remediation and suggested useful information for the preparing other adsorbents in environmental applications.

关 键 词：ADSORPTION Mesoporous silica Amino groups Fe3＋ TETRACYCLINE 

分 类 号：X703[环境科学与工程—环境工程]