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J Colloid Interface Sci

Title:		Improved photocatalytic oxidation performance of gaseous acetaldehyde by ternary g-C(3)N(4)/Ag-TiO(2) composites under visible light
Author(s):		Wang C; Rao Z; Mahmood A; Wang X; Wang Y; Xie X; Sun J;
Address:		"State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China; University of Chinese Academy of Sciences, 19 (A) Yuquan Road, Beijing 100049, China. State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China. State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China. Electronic address: wangyan@mail.sic.ac.cn. State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China. Electronic address: jingsun@mail.sic.ac.cn"
Journal Title:		J Colloid Interface Sci
Year:		2021
Volume:		20210604
Issue:
Page Number:		699 - 711
DOI:		10.1016/j.jcis.2021.05.186
ISSN/ISBN:		1095-7103 (Electronic) 0021-9797 (Linking)
Abstract:		"In the process of photocatalytic oxidation (PCO), titanium dioxide (TiO(2)) shows excellent capabilities. However, when TiO(2) is used to remove volatile organic compounds (VOCs), there are some drawbacks including weak adsorption of gaseous contaminants, insufficient utilization of sunlight, and rapid recombination of photogenerated carriers. Herein, a TiO(2)-based ternary heterogeneous photocatalyst, g-C(3)N(4)/Ag-TiO(2), was successfully fabricated to photodegrade gaseous acetaldehyde (one of the representatives of oxygenated VOCs) under visible light. Among the various samples, the g-C(3)N(4)/50 wt% Ag-TiO(2) exhibited an excellent photocatalytic activity, which was 5.8 times of bare TiO(2). The mineralization efficiency of acetaldehyde was also increased by 3.7 times compared to bare TiO(2). The substantial improvement in the PCO performance of the ternary system can be associated with the good adsorption to acetaldehyde gas and light-harvesting capability, as well as improved charge separation process. The application of Langmuir-Hinshelwood kinetic model suggested that relative humidity played a significant role in the VOCs degradation. Also, the photodegradation of gaseous acetaldehyde primarily occurred on the catalysts surface. Based on several characterizations, i.e., UV-vis spectroscopy, photoluminescence spectrum, photocurrent spectroscopy and electron spin-resonance test, a suitable degradation mechanism is proposed. This study provides a novel ternary photocatalyst with improved photocatalytic performance and stability, which can be used for the low-concentration VOCs abatement in the indoor environment"
Keywords:		Acetaldehyde Adsorption Photocatalysis TiO(2) VOCs g-C(3)N(4);
Notes:		"PubMed-not-MEDLINEWang, Congyu Rao, Zepeng Mahmood, Asad Wang, Xiao Wang, Yan Xie, Xiaofeng Sun, Jing eng 2021/06/22 J Colloid Interface Sci. 2021 Nov 15; 602:699-711. doi: 10.1016/j.jcis.2021.05.186. Epub 2021 Jun 4"