Multi-function adsorbent-photocatalyst MXene-TiO_(2) composites for removal of enrofloxacin antibiotic from water  

作　　者：Siwanat Sukidpaneenid Chamorn Chawengkijwanich Chonlada Pokhum Toshihiro Isobe Pakorn Opaprakasit Paiboon Sreearunothai 

机构地区：[1]TAIST-Tokyo Tech Program,Sirindhorn International Institute of Technology,Thammasat University,Pathum Thani 12121,Thailand [2]National Nanotechnology Center,National Science and Technology Development Agency,Pathum Thani 12120,Thailand [3]Department of Materials Science and Engineering,School of Materials and Chemical Technology,Tokyo Institute of Technology,Tokyo 152-8550,Japan [4]School of Bio-Chemical Engineering and Technology,Sirindhorn International Institute of Technology,Thammasat University,Pathum Thani 12121,Thailand

出　　处：《Journal of Environmental Sciences》2023年第2期414-428,共15页环境科学学报（英文版）

基　　金：National Nanotechnology Center (NANOTEC) (No.P1751698) for financial support;Thailand Advanced Institute of Science and Technology and Tokyo Institute of Technology (TAIST-Tokyo Tech) for collaborative program and scholarship supports;supported by Thammasat University Research Fund Contract No.TUFT 055/2563;Support from Center of Excellence in Functional Advanced Materials Engineering (CoE FAME),SIIT

摘　　要：MXenes,a new family of two-dimensional transition metal carbides or nitrides,have attracted tremendous attention for various applications due to their unique properties such as good electrical conductivity,hydrophilicity,and ion intercalability.In this work,Ti_(3)C_(2) MXene,or MX,is converted to MX-TiO_(2) composites using a simple and rapid microwave hydrothermal treatment in HCl/NaCl mixture solution that induces formation of fine TiO_(2) particles on the MX parent structure and imparts photocatalytic activity to the resulting MX-TiO_(2) composites.The composites were used for enrofloxacin(ENR),a frequently found contaminating antibiotic,removal from water.The relative amount of the MX and TiO_(2) can be controlled by controlling the hydrothermal temperature resulting in composites with tunable adsorption/photocatalytic properties.NaCl addition was found to play important role as composites synthesized without NaCl could not adsorb enrofloxacin well.Adding NaCl into the hydrothermal treatment causes sodium ions to be simultaneously intercalated into the composite structure,improving ENR adsorption greatly from 1 to 6 mg ENR/g composite.It also slows down the MX to TiO2 conversion leading to a smaller and more uniform distribution of TiO_(2) particles on the structure.MX-TiO_(2)/NaCl composites,which have sodium intercalated in their structures,showed both higher ENR adsorption and photocatalytic activity than composites without NaCl despite the latter having higher TiO2 content.Adsorbed ENR on the composites can be efficiently degraded by free radicals generated from the photoexcited TiO2 particles,leading to high photocatalytic degradation efficiency.This demonstrates the synergetic effect between adsorption and photocatalytic degradation of the synthesized compounds.

关 键 词：MXene-TiO_(2)composites Ti3C2 Ion-exchange Photocatalytic degradation ENROFLOXACIN Antibiotics removal 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]