介孔氮化碳光催化降解诺氟沙星的动力学机制

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Abstract

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.

Key words： mpg-C₃N₄ norfloxacin photocatalytic degradation kinetic model photocatalytic degradation mechanism

Received: 27 September 2017

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	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

Cite this article:

WANG Ying-fei,WANG Feng-liang,LI Jie-hua等. Photocatalytic degradation kinetics and mechanism of norfloxacin using mesoporous g-C₃N₄ under visible-light irradiation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(4): 1346-1355.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I4/1346

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