Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 349, Issue -, Pages 91-100Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.01.048
Keywords
Mn/g-C3N4/ZSM-4; Multi-functional photocatalyst; VUV irradiation; O-3 Elimination; VOCs degradation
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Funding
- Research Grant Council, Hong Kong SAR Government [GRF14100115]
- Technology and Business Development Fund of The Chinese University of Hong Kong [TBF15SCI008]
- National Natural Science Foundation of China [41573086, 51578556]
- Natural Science Foundation of Guangdong Province [2015A030308005]
- Science and Technology Research Programs of Guangdong Province [2014A020216009]
- CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences [2015HSC-UE004]
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The process of vacuum ultraviolet (VUV)-assisted photocatalytic oxidation (PCO) has attracted great interest for volatile organic compounds (VOCs) degradation owing to its strong oxidation capability. However, the O-3 by-product from VUV irradiation causes secondary pollution and needs to be overcome. In this study, a multifunctional photocatalyst of Mn/g-C3N4/ZSM-4 was thus developed by a one-pot hydrothermal method, and then combined with VUV irradiation to eliminate O-3 byproduct as well as enhance toluene degradation via ozone assisted catalytic oxidation (OZCO). Under VUV irradiation alone, 64% of toluene degradation was occurred but 51 ppm of O-3 was residual. In contrast, toluene degradation was enhanced to 96% over the Mn/g-C3N4/ZSM-4 while residual O(3)was decreased to 4 ppm. The enhanced performance was attributed to the synergistic PCO and OZCO, as the Mn modification can efficiently enhance the photocatalytic activity of g-C3N4 and trigger the catalytic ozonation simultaneously. The results of electron spin resonance (ESR) confirmed the generation of reactive species such as center dot OH and center dot O-2(-) by VUV irradiation and then greatly enhanced after Mn/g-C3N4/ZSM-4 was added. Moreover, the possible mechanism of toluene degradation was also revealed through monitoring of
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