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Construction of g-C3N4/TiO2/Ag composites with enhanced visible-light photocatalytic activity and antibacterial properties

文献类型： 外文期刊

作者： Yan, Dong 1 ; Wu, Xin 2 ; Pei, Jiayun 2 ; Wu, Chaochao 2 ; Wang, Xiumei 5 ; Zhao, Haiyan 2 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing 100097, Peoples R China

2.Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China

3.Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China

4.Colorado Sch Mines, George S Ansell Dept Met & Mat Engn, Golden, CO 80401 USA

5.Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

6.Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

关键词： g-C3N4/TiO2/Ag composites; Photocatalytic activity; Antibacterial properties

期刊名称：CERAMICS INTERNATIONAL （ 影响因子：4.527； 五年影响因子：4.049 ）

ISSN： 0272-8842

年卷期： 2020 年 46 卷 1 期

页码：

收录情况： SCI

摘要： In this study, the multifunctional carbon nitride based composite graphitic-C3N4 (g-C3N4)/TiO2/Ag was prepared through a simple and efficient vacuum freeze-drying route. TiO2 and Ag nanoparticles were demonstrated to decorate onto the surface of g-C3N4 sheet. In the ultraviolet-visible absorption test, a narrower band gap and red-shift of light absorption edge were observed for g-C3N4/TiO2/Ag compared to pristine g-C3N4 and single-component modified g-C3N4/TiO2/Ag . The photodegradation property of g-C3N4/TiO2/Ag was investigated toward the degradation of methylene blue (abbreviated as MB) under the irradiation of visible light. These results indicated that the degradation performance of organic dyes for g-C3N4/TiO2/Ag was obviously improved compared with g-C3N4/TiO2/ and g-C3N4. The reaction rate constant of MB degradation for g-C3N4/TiO2/Ag was 4.24 times higher than that of pristine g-C3N4. In addition, such rationally constructed nanocomposite presented evidently enhanced antibacterial performance against the Gram-negative Escherichia coli. Concentration dependent antibacterial performance was systematically investigated. And 84% bacterial cell viability loss had been observed at 500 mu g/mL g-C3N4/TiO2/Ag within 2 h visible light irradiation.

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