Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (8): 1186-1197.DOI: 10.1016/S1872-2067(19)63516-3

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

Chen Zhaoa,b, Zhihua Wanga, Xi Chenb, Hongyu Chub, Huifen Fub, Chong-Chen Wangb   

  1. a State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    b Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
  • Received:2019-11-26 Revised:2019-12-23 Online:2020-08-18 Published:2020-08-08
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21876008, 51578034 and 51878023), Great Wall Scholars Training Program Project of Beijing Municipality Universities (CIT&TCD20180323), Project of Construction of Innovation Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality (IDHT20170508), Beijing Talent Project (2018A35), Fundamental Research Funds for Beijing Universities (X18075/X18076/X18124/X18125/X18276), and Scientific Research Foundation of Beijing University of Civil Engineering and Architecture (KYJJ2017033/KYJJ2017008).

Abstract: N-doped anatase-rutile titanium dioxide (N-TiO2) is a classical semiconductor widely used in environmental remediation. Its photocatalytic performance is typically affected by its morphology, porous structure, and phase composition. Herein, disk-like mesoporous N-TiO2 was prepared by calcining MIL-125(Ti) and melamine matrix at different temperatures in air. The photocatalytic efficiency of the prepared mesoporous N-TiO2 for the photo-oxidation of gaseous benzene under visible-light irradiation was studied. With respect to light absorption and mass transfer, as-prepared N-TiO2 annealed at 500℃ (MM-500) showed the best photocatalytic activity with corresponding photodegradation and mineralization efficiencies of 99.1% and 72.0%, respectively. In addition, MM-500 exhibited excellent reusability and stability in cyclic experiments, in which 84.8% of gaseous benzene could still be photodegraded after 10 experimental cycles. Furthermore, electron spin resonance analysis indicated that ·OH and ·O2- radicals were the dominating reactive oxygen species during the photo-oxidation process. Their excellent performance suggests that the as-prepared N-TiO2 photocatalysts can be used to eliminate volatile organic compounds.

Key words: Metal-organic framework, N-TiO2, Visible light, Photocatalytic oxidation, Gaseous benzene