Visible-light catalytic performance and mechanism of mesoporous TiO2 modified by N2 plasma

被引：0

作者：

Zhao W. ^{[1
,2
]}

Zhao Y. ^{[1
,2
]}

Chai Z. ^{[1
,2
]}

Zhang S. ^{[1
,2
]}

Wang S. ^{[1
,2
]}

Jiao Z. ^{[1
,2
]}

机构：

[1] College of Environmental Science and Engineering, Hebei University of Science and Technology, Hebei, Shijiazhuang

[2] Key Laboratory of Pollution Prevention and Control Biotechnology of Hebei Province, Hebei University of Science and Technology, Hebei, Shijiazhuang

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 11期

关键词：

catalytic; mechanism; mesoporous TiO[!sub]2[!/sub; model; N[!sub]2[!/sub] plasma; reactivity; visible-light;

D O I：

10.16085/j.issn.1000-6613.2022-0126

中图分类号：

学科分类号：

摘要：

Mesoporous TiO2 photocatalysts (M-TiO2) were prepared by nitrogen (N2) plasma modification in a quartz plate dielectric barrier discharge (DBD) reactor. The M-TiO2 were characterized by XRD, TEM, UV-vis DRS, BET and XPS techniques. M-TiO2(CTP+C) and M-TiO2(C+CTP) showed better visible light catalytic performance than M-TiO2(C). When the molar ratio of CTAB/Ti was 1∶3, M-TiO2 (CTP+C) had the highest specific surface area (238.2m2/g), the narrowest band gap (2.51eV) and the largest OV/O (35.7%). M-TiO2(CTP+C) exhibited better catalytic activity and chemical stability, and the degradation rate of MO reached 90% within 240min of visible-light irradiation. The N2 low temperature plasma modification can effectively improve the dispersion of M-TiO2 grains and promote the conversion of Ti4+ to Ti3+ . An enhancement of the visible-light catalytic activity of M-TiO2 was obtained by the combined effect of oxygen vacancy, interstitial carbon and interstitial nitrogen. The results of active species capture experiment and Mott-Schottky curve showed that O2•- and h+ played a major role in the visible-light degradation of MO. Based on the above observations, the mechanism model of M-TiO2(CTP+C) visible light catalysis was given. © 2022 Chemical Industry Press. All rights reserved.

引用

页码：5820 / 5829

页数：9

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