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个人信息Personal Information
教授
博士生导师
硕士生导师
性别：男
毕业院校：大连理工大学
学位：博士
所在单位：电气工程学院
学科：电工理论与新技术. 环境工程
办公地点：Institute of Electrostatics and Special Power
联系方式：shangkf@dlut.edu.cn
电子邮箱：shangkf@dlut.edu.cn
Enhanced catalytic performance of graphene-TiO2 nanocomposites for synergetic degradation of fluoroquinolone antibiotic in pulsed discharge plasma system
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论文类型：期刊论文
发表时间：2019-07-05
发表刊物：APPLIED CATALYSIS B-ENVIRONMENTAL
收录刊物：SCIE、EI
卷号：248
页面范围：552-566
ISSN号：0926-3373
关键字：Graphene-TiO2; Photocatalysis; Flumequine; Degradation; Pulsed discharge plasma
摘要：A hybrid graphene-TiO2 nanocomposites have been prepared by a facile hydrothermal method to improve the photocatalytic performance and applied for synergetic degradation of fluoroquinolone antibiotic in pulsed discharge plasma (PDP) system. The characterizations of the structure and morphology, chemical bonding state, optical property and electrochemical property show that the graphene-TiO2 nanocomposites can be hybridized successfully. Compared to the pure TiO2, the light absorption range can extend to visible light ( < 505 nm) and the recombination rate of electron-hole pairs declines apparently in the graphene-TiO2 samples. The degradation performance experiment manifests a significant enhancement of the removal efficiency of flumequine (FLU) when the graphene-TiO2 samples are added in the PDP system. The highest removal efficiency can reach 99.4% in PDP/graphene-TiO2 system with 5% graphene content, which is 23.7% and 34.6% higher than that in PDP/TiO2 system and sole PDP system, respectively. Correspondingly, the kinetic constant is 3.5 and 4.6 times higher than that in PDP/TiO2 system and sole PDP system, respectively. The radical species trapping test suggests that (OH)-O-center dot, h(+) and O-2 (-) play the critical role for FLU degradation in PDP/graphene-TiO2 system. The graphene-TiO2 samples can further decompose the O-3 and improve the generation of (OH)-O-center dot and H2O2. The degradation intermediates are determined by LC-MS and IC. The toxicity evolution of FLU reaction solutions is evaluated based on inhibition of photobacterium V. fischeri. Finally, the FLU degradation mechanism in the PDP/graphene-TiO2 system is proposed. This research would provide a novel insight into the application of graphene-based nanocomposites in PDP system as a promising remediation methodology for organic contaminants in water.