文献类型： 外文期刊

作者： Huang, Wenqian ¹ ; Ruan, Shuhong ¹ ; Zhao, Mengjiu ¹ ; Xu, Ruishuang ¹ ; Chen, Zhengqiang ¹ ; Gao Zhihong ³ ; Song, Haiyan ¹ ;

作者机构： 1.South China Normal Univ, Sch Chem, Guangzhou 510006, Peoples R China

2.Guangdong Acad Agr Sci, Sericulture & Agrifood Res Inst, Key Lab Funct Foods, Minist Agr & Rural Affairs,Guangdong Key Lab Agr, Guangzhou 510610, Peoples R China

3.South China Normal Univ, Anal & Testing Ctr, Guangzhou 510006, Peoples R China

关键词： CeO2/g-C3N4 photocatalyst; Escherichia coli K-12; Bactericidal mechanism; Z-scheme charge migration

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.968； 五年影响因子：7.317 ）

ISSN： 2213-2929

年卷期： 2021 年 9 卷 6 期

页码：

收录情况： SCI

摘要： Photocatalytic inactivation has been considered as a promising strategy to address the biohazards threat to human health. However, acquiring an efficient photocatalytic system with the merits of visible-light response is still challenging. In this study, a novel visible-light-driven 0D/2D CeO2/g-C3N4 heterojunction photocatalyst was fabricated and the photocatalytic bactericidal performance of CeO2/C3N4 composites were evaluated by using Escherichia coli K-12 (E. coli K-12). The results showed that 7 log cfu/mL Escherichia coli was completely inactivated by the optimal 8% CeO2/g-C3N4 composites within 3 h visible-light irradiation, but only 0.4 and 1.4 log cfu/mL Escherichia coli were inactivated by CeO2 and g-C3N4, respectively. This finding indicated that the CeO2/g-C3N4 composite has outstanding photocatalytic bactericidal performance over the bare CeO2 or g-C3N4, which should be attributed to the effective separation and migration of photoinduced electron-hole pair. In addition, the result of trapping experiments indicated that the major active species of E. coli K-12 inactivation are photoinduced hole and superoxide radicals. Furthermore, the Z-scheme charge migration mechanism was proposed for the photocatalytic bactericidal process of CeO2/g-C3N4 basing on the bactericidal performance and redox potential of the catalysts. This work confirmed that the constructing of the CeO2/g-C3N4 heterojunction is anticipated to be an effective strategy for water disinfection under visible-light illumination in a sustainable manner.