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Photocatalytic Activity Improvement of g-C3N4 under Visible Light by Optimizing Preparation Conditions
Jian-yang Hu,Guo-li Zhu
Author NameAffiliationE-mail
Jian-yang Hu School of Chemistry & Materials Science, University of Science and Technology of China, Hefei 230026, China hjychina@mail.ustc.edu.cn 
Guo-li Zhu Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Abstract:
Graphite-like C3N4 (g-C3N4) is ané cient visible-light-driven photocatalyst which is com-monly used in pollutant degradation. The photoreactivity of g-C3N4 depends on the prepa-ration conditions to a large extent. In this work, we linked the preparation conditions of g-C3N4 to its stability and photocatalytic activity through dye photodegradation experi-ments and sensitivity mathematical analyses. The sensitivity mathematical analyses show that the effect of calcination temperature is more significant than calcination time on the photoreactivity of g-C3N4. The photocatalytic activity of optimized g-C3N4 in rhodamine B (RhB) degradation under visible light was 100 times higher than that of non-optimized one. The enhanced performance can be attributed to the increased specific surface area of g-C3N4 and the increased migration velocity of photogenerated electron-hole pairs on the surface. This work deepens the understanding of the relation between preparation conditions and the charateristics of g-C3N4, and provides an extremely simple method for significantly improving the photoreactivity of g-C3N4.
Key words:  g-C3N4  Photocatalysis  Preparation condition  Optimization  Sensitivity analysis
FundProject:
石墨相氮化碳的制备条件优化用以提高其在可见光下的光催化活性
胡剑杨,朱国丽
摘要:
通过染料的光降解实验和敏感性数学分析探讨了石墨相氮化碳(g-C3N4)的制备条件与其稳定性和光催化活性之间的联系. 结果表明,相比于焙烧时间,焙烧温度的改变更为显著地影响了g-C3N4 的光催化活性. 制备条件优化之后的g-C3N4在可见光照射下催化降解罗丹明B(RhB)的活性比未优化时提高了约100倍,归因于材料比表面积的增大和表面光生电子-空穴迁移速度的增强.
关键词:  石墨相氮化碳  光催化  制备条件  优化  敏感性分析
DOI:10.1063/1674-0068/29/cjcp1506123
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