Photocatalytic degradation kinetics and mechanism of norfloxacin using mesoporous g-C3N4 under visible-light irradiation
WANG Ying-fei1, WANG Feng-liang1, LI Jie-hua1, XIE Zhi-jie1, SU Yue-han1, ZHANG Qian-xin1, YAO Kun1, LV Wen-ying1, LIU Hai-jin2, LIU Guo-guang1
1. School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China;
2. School of Chemistry and environmental science, Henan Normal University, Xinxiang 453007, China
In this study, the photocatalytic degradation kinetics and mechanism of norfloxacin (NOR) were investigated in a sunlight-driven photocatalyst mesoporous g-C3N4 (mpg-C3N4). The morphology and structure of mpg-C3N4 were studied by transmission electron microscope (TEM), X-ray diffraction (XRD), and nitrogen adsorption-desorption isotherms (BET). The results showed that mpg-C3N4 exhibited the mesoporous structure with the pore size of ca. 12nm, which could provide more active site for photoreaction. Ultraviolet-visible DRS spectrum (UV-vis) showed that mpg-C3N4 exhibits high optical absorption capacity for visible light. Fluorescence pectrophotometer (PL) spectrum revealed that the mesoporous structure might restrain the recombination rate of photogenerated electrons and holes. The degradation of NOR followed the Langmuir-Hinshelwood (L-H) kinetics model, and the adsorption of NOR followed the second order kinetics, indicating that surface reactions and chemisorptions played the important roles during the photocatalysis process. mpg-C3N4 showed an enhanced reaction and adsorption for NOR degradation than g-C3N4. Almost 56.78% of NOR can be absorbed by mpg-C3N4 within 30 min absorption. Under 1.5h of simulated sunlight irradiation, around 90% of NOR can be decomposed. Effect of pH on photocatalytic degradation of NOR showed that mpg-C3N4 posed an optimal photocatalytic performance under neutral condition. Further study of reactive species (RSs) by RSs scavenging experiment showed that superoxide anion radical (O2·-) and photohole (h+) were responsible for the major degradation of NOR.
王盈霏, 王枫亮, 黎杰华, 谢治杰, 苏跃涵, 张钱新, 吕文英, 姚琨, 刘海津, 刘国光. 介孔氮化碳光催化降解诺氟沙星的动力学机制[J]. 中国环境科学, 2018, 38(4): 1346-1355.
WANG Ying-fei, WANG Feng-liang, LI Jie-hua, XIE Zhi-jie, SU Yue-han, ZHANG Qian-xin, YAO Kun, LV Wen-ying, LIU Hai-jin, LIU Guo-guang. Photocatalytic degradation kinetics and mechanism of norfloxacin using mesoporous g-C3N4 under visible-light irradiation. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(4): 1346-1355.
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