Novel Au@C modified g-C3N4 (Au@C/g-C3N4) as efficient visible-light photocatalyst for toxic organic pollutant degradation: Synthesis, performance and mechanism insight

被引：51

作者：

Huang, Xixian ^{[1
]}

Zhu, Nengwu ^{[1
,2
,3
,4
]}

Mao, Fulin ^{[1
]}

Ding, Yang ^{[1
]}

Zhang, Sihai ^{[1
]}

Li, Fei ^{[1
]}

Liu, Huangrui ^{[1
]}

Wu, Pingxiao ^{[1
]}

机构：

[1] South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Peoples R China

[2] Minist Educ, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Guangzhou 510006, Peoples R China

[3] Guangdong Environm Protect Key Lab Solid Waste Tr, Guangzhou 510006, Peoples R China

[4] Guangdong Prov Key Lab Solid Wastes Pollut Contro, Guangzhou 510006, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2020年 / 252卷

关键词：

g-C3N4; Au@C; Visible-light photocatalysis; Synergistic mechanism; Organics degradation; COMPOSITE PHOTOCATALYSTS; FACILE SYNTHESIS; CARBON MATERIALS; WASTE-WATER; BISPHENOL-A; HETEROJUNCTION; NANOPARTICLES; REMOVAL; PHOTODEGRADATION; NANOSHEETS;

D O I：

10.1016/j.seppur.2020.117485

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Tailoring economical g-C3N4-based composites with efficient visible-light photocatalytic degradation ability have received great attention. In this study, a novel and efficient visible-light photocatalyst, Au nanoparticles doped porous carbon modified g-C3N4 (Au@C/g-C3N4), was synthesized using thermal polycondensation method. The crystal, morphological and photoelectrical characterizations verified the successful synthesis of Au@C/g-C3N4 hybrid and it had larger specific area and narrower band gap than that of pure g-C3N4. The optimal Rhodamine B (RhB) photocatalytic oxidation performance (94.3%) and mineralization rate (50.7%) were obtained by Au@C/g-C3N4-2 composite at 1.0 g L-1 catalyst dosage and pH of 5.0, which was 3.23 and 2.96 times, respectively than that of g-C3N4 at the same conditions. Au@C/g-C3N4-2 also maintained satisfactory RhB degradation efficiency (70.7%) after 4 consecutive photocatalytic cycles. Mechanism analyses indicated that the significantly improved photocatalytic activity of Au@C/g-C3N4 composite mainly attributed to the rapid separation and migration of charge carriers via the interfacial interaction between the Au@C and g-C3N4, which resulted in the accelerated %O-2- generation for organic pollutants oxidation. In general, this study supplied a novel strategy for efficient g-C3N4 visible-light photocatalysts construction, and further clarified its plausible visible-light photocatalytic mechanism. Superscript/Subscript Available

引用

页数：11

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