title: Preparation of amino-Fe(III) functionalized mesoporous silica for synergistic adsorption of tetracycline and copper.
abstract: Finding effective methods for simultaneous removal of antibiotics and heavy metals has attracted increasing concern since both of them are frequently detected in aquatic environments. In this study, a novel mesoporous silica adsorbent (Fe-N,N-SBA15) contained dual-functional groups was synthesized by first grafting di-amino groups on SBA15, and then coordinating Fe(III) onto the adsorbent. The adsorbent was then used in the synchronous elimination of tetracycline (TC) and Cu(II) from water, which was deeply studied by solution pH, kinetics, equilibriums in sole and binary systems. It was found that the adsorbent had high affinity for both TC and Cu(II) and synergistic effects on the adsorption were found. The solution pH remarkably affected the adsorption due to pH-dependent speciation of TC, Cu(II), TC-Cu(II) complex and the surface properties of the adsorbent. Increasing adsorption amount of TC and Cu(II) on the adsorbent could be attributed to the formation of complex TC-Cu(II) bridging or the stronger affinity of the adsorbent for the TC-Cu(II) complex than that for TC or Cu(II) separately. FT-IR and XPS studies revealed that Fe(III) and amino groups on the adsorbent were complexed with the amide of TC and Cu(II), respectively. The recyclabilities of the adsorbent were also evaluated and the Fe-N,N-SBA15 exhibited good reusability for TC and Cu(II) removal. This study shows guidelines and offers an innovative, effective method for the synergistic removal of antibiotics and heavy metals from aquatic environments.
authors.affiliation: Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Ziyang
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: hjliu@rcees.ac.cn.
authors.forename: Huijuan
authors.initials: H
authors.lastname: Liu
authors.affiliation: Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Wu
authors.affiliation: Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Huachun
authors.initials: H
authors.lastname: Lan
authors.affiliation: Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Jiuhui
authors.initials: J
authors.lastname: Qu
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013752:Tetracycline / Q000737:chemistry* / Q000302:isolation & purification; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; D012822:Silicon Dioxide; D003300:Copper; D007501:Iron; D013752:Tetracycline
keywords: Adsorption; Copper; Cosorption; Functionalized SBA15; Tetracycline