摘要
采用水热合成法制备的多壁碳纳米管/钨酸铋复合光催化剂(MWCNTs/Bi2WO6),通过光催化氧化处理环丙沙星(CIP)废水,并用X射线衍射(XRD)、扫描电子显微镜(SEM)和比表面积分析(BET)等技术对MWCNTs/Bi_2WO_6复合光催化剂进行表征。结果表明,该复合催化剂中Bi_2WO_6属于斜方晶型,颗粒均匀且与MWCNTs紧密交织。多壁碳纳米管的引入使该复合催化剂的光催化性能和吸附性能都明显优于纯Bi_2WO_6。当MWCNTs掺杂量为6%时,复合催化剂的光催化活性最高。在催化剂用量为0. 5 g/L、CIP初始浓度为20 mg/L、pH值为6. 8、光催化处理180min的条件下,对CIP的去除率可达91. 5%。经过4次重复循环使用,对CIP的去除率仍能达到80%以上。光催化活性的增强,可归因于MWCNTs的掺杂有效抑制了光生电子-空穴对复合。
Prepared by the hydro-thermal method, the composite photocatalysts multi-walled carbon nanotubes/bismuth tungstate （MWCNTs/Bi2WO6） were used to treat ciprofloxacin wastewater. The structure and the morphology of MWCNTs/Bi2WO6 were characterized by the X-ray diffraction （XRD）, the scanning electron microscope （SEM）, and the Brunauer-Emmett-Teller （BET） techniques. The resuits indicated that the Bi2 WO6 in the catalyst was rhombic crystal with uniform particles, and was closely interwoven with MWCNTs. The introduction of MWCNTs enhanced the photocatalytic activity and the adsorption performance of the MWCNTs/BizWO6 composite, compared with the pure BizWO6. The photocatalytic activity of the composite catalysts reached the maximum with 6% MWCNTs. Ciprofloxacin re- moval rate of 91.5% was achieved in 180 min when catalyst dosage was O. 5 g/L, the initial concentration of the ciprofloxacin was 20 mg/L, and pH was 6.8. The removal rate of the ciprofloxacin remained beyond 80% after 4 cycles. The enhanced photocatalytic activity was attributed to the doping of MWC- NTs, which suppressed the recombination of photogenerated electron-hole pairs.
作者
罗力莎
马军
辛丙靖
于凤丽
周明
刘中芳
LUO Li-sha;MA Jun;XIN Bing-jing;YU Feng-li;ZHOU Ming;LIU Zhong-fang(College of Resources and Environmental Engineering,Jilin Institute of Chemical Technology,Jilin 152021,China;State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China;College of Architectural Engineering and Art Design,Chongqing Industry Polytechnic College,Chongqing 401120.China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第17期52-57,共6页
China Water & Wastewater
基金
吉林市科技局资助项目(20166024)
关键词
多壁碳纳米管
钨酸铋
光催化剂
环丙沙星
muhi-walled carbon nanotube
bismuth tungstate
photocatalyst
ciprofloxacin
