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材料工程  2018, Vol. 46 Issue (9): 39-45    DOI: 10.11868/j.issn.1001-4381.2017.001419
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
王娟1,2, 王国宏1,2,3, 孙玲玲1,2
1. 湖北师范大学 污染物分析与资源化技术湖北省重点实验室, 湖北 黄石 435002;
2. 湖北师范大学 化学化工学院, 湖北 黄石 435002;
3. 湖北师范大学 先进材料研究院, 湖北 黄石 435002
Preparation of Ag2CO3/Ag/g-C3N4 Z-scheme Heterostructure and Photocatalytic Degradation of Rhodamine B Under Visible Light
WANG Juan1,2, WANG Guo-hong1,2,3, SUN Ling-ling1,2
1. Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, Hubei Normal University, Huangshi 435002, Hubei, China;
2. College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, Hubei, China;
3. Institute for Advanced Materials, Hubei Normal University, Huangshi 435002, Hubei, China
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摘要 通过煅烧处理和沉淀反应合成以Ag纳米粒子为电子媒介的Z-型光催化剂Ag2CO3/Ag/g-C3N4。在可见光照射下,降解RhB评价Ag2CO3/Ag/g-C3N4复合物的光催化活性。结果表明:Ag2CO3/Ag/g-C3N4样品显示出比纯Ag2CO3和g-C3N4更强的光催化活性,当g-C3N4与Ag2CO3/Ag质量比为20%时,复合物呈现出最好的光催化性能,这归因于在Ag2CO3和g-C3N4间形成的Z-型异质结构,其有效促进电子转移速率和光生电子-空穴的分离。Z-型异质结构扩展了可见光吸收波长范围(从450nm到670nm),这是由于Ag纳米粒子表面离子共振的结果。捕获实验证实,在光催化降解RhB反应中,·O2-和空穴h+是主要活性物质,·OH是次要活性物质,并提出了增强光催化活性的机理。
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关键词 Ag2CO3/Ag/g-C3N4Z-型光催化剂可见光光催化活性    
Abstract:The highly efficient Z-scheme photocatalyst Ag2CO3/Ag/g-C3N4 with Ag nanoparticles, as an electron mediator, was fabricated by a simple calcinations-precipitation reaction. Photocatalytic experiments of the as-prepared samples were tested by the photocatalytic oxidation degradation of RhB aqueous solution. The results show that Ag2CO3/Ag/g-C3N4 composites exhibit enhanced photocatalytic activity, compared with Ag2CO3 and g-C3N4. The composites exhibit the highest photocatalytic performance, when the mass ratio of g-C3N4 to Ag2CO3/Ag is 20%,which is attributed to the formation of Z-scheme heterojunction structure between Ag2CO3 and g-C3N4, thus accelerating electron transfer rate and separating efficiently the photo-generated electron-hole pairs. Meanwhile, the Z-scheme heterojunction structures extend the wavelength range of visible light absorption (from 450nm to 670nm) due to the surface plasma resonance (SPR) of Ag nanoparticles. The trapping experiment results confirm that·O2- and h+ are main active species,·OH plays a relatively minor role in the decomposition of RhB. A possible mechanism for enhanced photocatalytic activity of Ag2CO3/Ag/g-C3N4 heterojunction photocatalyst is proposed.
Key wordsAg2CO3/Ag/g-C3N4    Z-scheme photocatalyst    visible light    photocatalytic activity
收稿日期: 2017-11-16      出版日期: 2018-09-19
中图分类号:  O643  
通讯作者: 王国宏(1968-),男,教授,博士,主要从事半导体材料的制备及应用方面的研究工作,联系地址:湖北省黄石市磁湖路11号湖北师范大学化学化工学院(435002),     E-mail:
王娟, 王国宏, 孙玲玲. Ag2CO3/Ag/g-C3N4Z-型异质结的制备及可见光催化降解RhB[J]. 材料工程, 2018, 46(9): 39-45.
WANG Juan, WANG Guo-hong, SUN Ling-ling. Preparation of Ag2CO3/Ag/g-C3N4 Z-scheme Heterostructure and Photocatalytic Degradation of Rhodamine B Under Visible Light. Journal of Materials Engineering, 2018, 46(9): 39-45.
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