Cu-ZnO/g-C_(3)N_(4)复合材料可见光催化降解环丙沙星效率及机理研究  

Study on Efficiency and Mechanism of Visible-light Photocatalytic Degradation of Ciprofloxacin by Using Cu-ZnO/g-C_(3)N_(4)Composite

作　　者：蒋柱武 史安童 沈俊宏 JIANG Zhuwu;SHI Antong;SHEN Junhong(College of Ecological Environment and Urban Construction,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]福建工程学院生态环境与城市建设学院,福州350118

出　　处：《材料导报》2022年第20期80-86,共7页Materials Reports

基　　金：国家自然科学基金(51878171)。

摘　　要：针对抗生素类新型污染物在水环境中的污染现状及治理问题,本研究制备了Cu掺杂ZnO耦合g-C_(3)N_(4)的复合材料(Cu-ZnO/g-C_(3)N_(4)),并考察其在可见光下催化降解抗生素环丙沙星(CIP)的反应效率。通过X射线衍射(XRD)、红外光谱(FTIR)、扫描电镜(SEM)、透射电镜(TEM)、紫外-可见漫反射光谱(UV-Vis DRS)、荧光光谱(PL)和电子自旋顺磁共振(ESR)等分析手段对合成材料进行了表征,借助羟基自由基(·OH)测量技术量化了不同材料反应体系中·OH生成浓度的变化,进一步探究可能的光催化反应机理。结果表明,Cu-ZnO/g-C_(3)N_(4)复合材料在其异质结效应下具有极佳的可见光响应和增强的电荷转移性能,反应6 h后对CIP的去除效率高达97%,反应速率常数分别是ZnO、Cu-ZnO、g-C_(3)N_(4)的6.19倍、2.41倍和2.06倍,Cu-ZnO/g-C_(3)N_(4)复合材料是一种可用于去除水中微量污染物的高效可见光催化材料。With the aim of solving the pollution and remediation issues of antibiotic pollutants in aquatic environment,a novel Cu-ZnO/g-C_(3)N_(4)composite photocatalyst was synthesized in this work,with Cu-doped ZnO coupled with g-C_(3)N_(4).The degradation efficiency of ciprofloxacin(CIP)in the photocatalytic process of Cu-ZnO/g-C_(3)N_(4)under visible-light irradiation was investigated.Through various means such as X-ray diffraction analysis(XRD),Fourier-transform infrared spectroscopy(FTIR),scanning electron microscope(SEM),transmission electron microscopy(TEM),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),photoluminescence(PL)and electron spin resonance spectroscopy(ESR),the material properties of synthesized photocatalysts were characterized.By using the measurement technology of hydroxyl radicals(·OH),the formed concentration of·OH during photocatalytic process was quantified to further explore possible reaction mechanism.The results demonstrate that Cu-ZnO/g-C_(3)N_(4)possesses excellent visible-light responsivity and enhanced charge transfer ability due to a heterojunction effect,thereby CIP degradation rapidly reaching to 97%after 6 h.The reaction rate constant of Cu-ZnO/g-C_(3)N_(4)is 6.19 times,2.41 times and 2.06 times larger than that of ZnO,Cu-ZnO and g-C_(3)N_(4),respectively.Thus,the synthesized Cu-ZnO/g-C_(3)N_(4)can serve as an efficient visible-light active photocatalyst for micropollutant removal in water.

关 键 词：复合材料 可见光催化降解 环丙沙星 羟基自由基 异质结效应 

分 类 号：O649[理学—物理化学]