Difference of photodegradation characteristics between single and mixed VOC pollutants under simulated sunlight irradiation

doi:10.1016/j.jphotochem.2019.112029

SIC OpenIR

	Difference of photodegradation characteristics between single and mixed VOC pollutants under simulated sunlight irradiation
	Wang, Zhuang; Xie, Xiaofeng; Wang, Xiao; Mahmood, Asad; Qiu, Hanxun; Sun, Jing
	2019-11-01
Source Publication	JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
ISSN	1010-6030
Volume	384
Subtype	Article
Abstract	In realistic Volatile organic compounds (VOC)-containing polluted air, VOCs often do not exist alone, but different VOCs coexist. The interaction between different VOCs affects their photodegradation. However, few studies have focused on the photodegradation of mixed VOCs. Herein, rGO-TiO2 photocatalysts were synthesized by a modified refluxing-solvothermal method, and applied to photocatalytic degradation of single VOC (p-xylene and ethylene) and VOC mixture (containing benzene, toluene, p-xylene). It was found that rGO-TiO2 possessed higher photocatalytic degradation activity for single VOC and VOC mixture than pure TiO2. The increased single VOC adsorption capacity, more efficient light harvesting ability, and enhanced separation efficiency of electron-hole were responsible for improved degradation performance of rGO-TiO2. In addition, superoxide radicals played a more important role than hydroxyl radicals for removing both p-xylene and ethylene. Interestingly, commercial TiO2 (P25) underwent decreased efficiency (80.0% to 63.8%) in photodegrading from single p-xylene to p-xylene in VOC mixture, while it was remained unchanged (93.5%-93.0%) for T0.2G (0.2% mass ratio of reduced graphene oxide to TiO2). This could be mainly attributed to sufficient adsorption sites provided by rGO sheets to mitigate competitive adsorption. Simultaneously, its photocatalytic activity showed no obvious decrease after five photodegradation cycles of mixed VOCs. These results suggested great potential of efficient photodegradation of VOC mixture by rGO-TiO2.
Keyword	Photocatalysis rGO@TiO2 VOC mixture removal P-xylene Benzene derivatives
DOI	10.1016/j.jphotochem.2019.112029
Language	英语
WOS Research Area	Chemistry
Publisher	ELSEVIER SCIENCE SA
Citation statistics	Cited Times:4[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/26748
Collection	中国科学院上海硅酸盐研究所
Recommended Citation GB/T 7714	Wang, Zhuang,Xie, Xiaofeng,Wang, Xiao,et al. Difference of photodegradation characteristics between single and mixed VOC pollutants under simulated sunlight irradiation[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,2019,384.
APA	Wang, Zhuang,Xie, Xiaofeng,Wang, Xiao,Mahmood, Asad,Qiu, Hanxun,&Sun, Jing.(2019).Difference of photodegradation characteristics between single and mixed VOC pollutants under simulated sunlight irradiation.JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,384.
MLA	Wang, Zhuang,et al."Difference of photodegradation characteristics between single and mixed VOC pollutants under simulated sunlight irradiation".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 384(2019).

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