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赵晨老师为一作的论文被Chinese Journal of Catalysis接收

Robust photocatalytic benzene degradation with mesoporous disc-like N-TiO2 derived from MIL-125(Ti)

Chen Zhao, Zhihua Wang*, Xi Chen, Hongyu Chu, Huifen Fu, Chong-Chen Wang*

Abstract: N-doped anatase-rutile titanium dioxide (N-TiO2) is a classical semiconductor that has been widely used in environmental remediation. Its photocatalytic performance is typically affected by the corresponding morphology, porous structure, phase composition, etc. Herein, disc-like mesoporous N-TiO2 was prepared by calcining MIL-125(Ti) and melamine matrix at different temperatures under air atmosphere. The photocatalytic efficiencies for the benzene photooxidation in gaseous phase under visible light irradiation were studied. In view of in the performances of light absorption and mass transfer, the as-prepared N-TiO2 annealed at 500 oC (MM-500) showed the best photocatalytic activity with the corresponding photodegradation and mineralization efficiencies toward gaseous benzene being 99.1% and 72.0%, respectively. Meanwhile, the MM-500 exhibited excellent reusability and stability during the process of cyclic experiments, in which 84.8% of benzene can still be photodegraded after 10th run experiments. Furthermore, the electron spin resonance (ESR) analysis indicated that the ·OH and ·O2- radicals were identified as the dominating reactive oxygen species during the photo-oxidation process. The excellent performance revealed that the as-prepared N-TiO2 photocatalysts can be used to achieve the volatile organic compounds (VOCs) elimination.