Synthesis and Performance Enhancement Mechanis of BiOI/g-C3N4 Photocatalyst with High Activity
ZHU Jie1,2,3, LING Min1, MA Rundong1,2,3, WANG Ruifen1,2,3,*, AN Shengli1,2,3
1 School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China 2 Inner Mongolia Autonomous Region Key Laboratory of Advanced Ceramic Materials and Devices, Baotou 014010, Inner Mongolia, China 3 Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources, Ministry of Education, Baotou 014010, Inner Mongolia, China
Abstract: The synthesis of stable and efficient photocatalysts is the key of photocatalysis technology. Thiswork uses the situ deposition method to construct diverse mass ratio BiOI/CNx series of composite materials, which composited with BiOI doesn't influence the crystal structure of g-C3N4. In addition, the crystal form BiOI from composite products is closely adhered to the surface of lamellar g-C3N4. The introduction of BiOI obviously decreases band gap and availably increases the absorption of visible light. Meanwhile, the service life of photoproduction electron-holes gradually strengthens with the compound quantity of BiOI increasing. BiOI/CN15 has the strongest adsorption capacity and photocatalytic activity for RhB. Therefore, the absorption rate of g-C3N4 reached 55.15% under dark reaction for 30 minutes, which is 2.68 times than g-C3N4 in the same condition. The degradation rate of g-C3N4 was 87.69% at 10 minutes of photodegradation, which is 1.9 times than g-C3N4 in the same condition. The catalytic reaction rate constant is 5.551×10-2 min-1. And the degradation rate only decreased by 4.5% after five recycles, which owns good stability of photocatalyst. The combination of BiOI and g-C3N4 is beneficial to the effective separation of photogenic electron-holes pairs and the rapid transfer of electrons between interfaces. In the degradation of RhB by BiOI/CN15 composite photocatalyst, h+ and ·O2- are the main active substances.
通讯作者:
*王瑞芬,内蒙古科技大学材料与冶金学院副教授。2004年内蒙古科技大学化学教育专业本科毕业,2007年内蒙古大学物理化学专业硕士毕业后到内蒙古科技大学工作至今,2016年北京科技大学冶金工程专业博士毕业。目前主要从事光催化材料、稀土功能材料等方面的研究工作。发表论文40余篇,包括Journal of Rare Earths、Scientific Reports、Journal of Rare Earth等。jery19810528@126.com
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2024, Vol. 38 
