模拟日光下铌酸盐/钛酸纳米片催化降解水中环丙沙星  

Photocatalytic degradation of ciprofloxacin in water by niobate/titanate nanoflakes under simulated solar light

作　　者：张帆 刘晓娜 李博 贾晨辉 张浩清 刘月 谢添 钱天伟 ZHANG Fan;LIU Xiaona;LI Bo;JIA Chenhui;ZHANG Haoqing;LIU Yue;XIE Tian;QIAN Tianwei(School of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Jingtian Huize Environmental Technology Co.Ltd.,Taiyuan 030024,China;China Institute of Radiation Protection,Taiyuan 030024,China)

机构地区：[1]太原理工大学环境科学与工程学院,太原030024 [2]山西靖田会泽环境科技有限公司,太原030024 [3]中国辐射防护研究院,太原030024

出　　处：《环境工程学报》2022年第10期3232-3242,共11页Chinese Journal of Environmental Engineering

基　　金：山西省基础研究计划(自由探索类)资助项目(202103021223119);太原理工大学企业委托项目(RH2000005001)。

摘　　要：通过一步水热法制备新型铌酸盐/钛酸纳米片(Niobate/titanate nanoflakes,Nb-TiNFs)复合材料,采用XRD、XPS、FT-IR、SEM、TEM等分析手段对其形貌和结构进行了表征,并探究其在模拟日光下对目标污染物环丙沙星(ciprofloxacin,CIP)的降解性能和内在反应机理。结果表明,Nb-TiNFs可高效、快速光催化降解水中CIP。溶液pH可通过影响静电作用以及羟基自由基的形成而影响CIP的降解,在pH为6时,光催化剂(0.1 g·L^(−1))对水中CIP(10 mg·L^(−1))的降解率最大,即180 min内达到96.2%;常规离子Na^(+)和Fe^(3+)对CIP的降解无明显影响,但Ca^(2+)的存在对其产生一定抑制作用。降解过程中,超氧自由基(·O_(2)^(−))是主要的活性物质,材料内部形成的异质结导致带隙偏移,促进电子转移,抑制电子-空穴对的复合,从而促进了太阳光驱动的光催化活性。Nb-TiNFs合成方法简单、高效、稳定且对环境友好,在光催化去除水中新兴污染物领域具有一定的应用前景。Novel Niobate/titanate nanoflakes(Nb-TiNFs)composites were prepared by one-step hydrothermal method,and their morphology and structure were characterized by XRD,XPS,FT-IR,SEM,TEM,etc.Degradation performance and intrinsic reaction mechanism of target pollutant ciprofloxacin(CIP)by Nb-TiNFs composites under simulated sunlight were studied.The results showed that CIP in water could be efficiently and rapidly degraded by Nb-TiNFs through photocatalysis.The solution pH could affect the electrostatic effect and the formation of hydroxyl radicals,as well as CIP degradation.The maximum degradation rate of CIP(10 mg·L^(−1))occurred at 0.1 g·L^(−1) Nb-TiNFs(0.1 g·L^(−1))photocatalyst and pH 6,which was 96.2%within 180 min.Co-existing inorganic ions,such as Na^(+)and Fe^(3+),had no significant effect on the degradation,but the presence of Ca^(2+)partially inhibited the CIP removal.Superoxide radicals(·O_(2)^(−))were the primary reactive oxygen species for CIP photodegradation.The formation of heterojunctions led to the shift of the band gap,the promotion of electron transfer and the suppression of electron-hole pair complexation,thus promoted sunlight-driven photocatalytic activity.The synthesis method of Nb-TiNFs is simple,efficient,stable and environmentally friendly,and it has promising applications in the field of photocatalytic degradation of emerging pollutants in water.

关 键 词：铌酸盐/钛酸纳米片 可见光驱动 光催化 环丙沙星 

分 类 号：X703.1[环境科学与工程—环境工程]