多孔异质结g-C3N4/TiO2光催化剂的制备及其光催化性能研究
Preparation and photocatalytic performance of porous heterojunction g-C3N4/TiO2 photocatalyst
王智远 1田伟光 2余伟 2刘忠将 2王润兵 2付宇奇 2薛成斌 2江寒梅 2贾碧2
作者信息
- 1. 重庆科技大学化学化工学院,重庆 401331
- 2. 重庆科技大学冶金与材料工程学院,重庆 401331
- 折叠
摘要
环境污染是工业生产过程中亟需解决的一项重要问题,通过生物模板法合成了多孔异质结g-C3N4/TiO2光催化剂,在降解甲基橙废水过程中显示高效的光催化性能.酵母菌作为软模板剂为材料提供了多孔结构和大比表面积,增加了水溶液中活性反应位点;同时,g-C3N4/TiO2异质结结构作为电子转移通道,太阳光照射时,在内电场和库伦力作用下,氧化还原性较弱的电子和空穴互相结合,氧化还原能力较强的电子-空穴对保留下来.自由基捕获实验揭示了光照条件下复合材料周围出现的·OH和O2-分子,是光催化降解过程的主要作用成分.因此,生物模板法制备的多孔异质结g-C3N4/TiO2是一种具有前景的降解有机染料废水的光催化剂.
Abstract
Environmental pollution is an important problem that needs to be solved in the process of industrial production.We synthesized g-C3N4/TiO2 heterojunction photocatalyst by biological template method,which showed better photocatalytic performance than pure TiO2 water solution in the process of degrading MO wastewater.The Yeast as soft biological template provided the materials with a porous structure and a large specific surface area,which increased the reactive sites in the aqueous solution and respectively,the g-C3N4/TiO2 heterojunction structure acted as an electron transfer channel.light conditions,by the influence of internal electric field and Coulomb force,relatively useless electron-hole pairs got recombination and supreme redox a-bility electron-hole pairs are retained,respectively the retained electron-hole pairs provied the materials with the strongest redox capacity.XPS analysis verified that the direction of electron transfer was from g-C3N4 to TiO2 The radical trapping experiment revealed that·OH and O2-molecules appeared around the composites,which were the main active ingredient in the photocatalytic degradation process.Therefore,the g-C3N4/TiO2 compos-ites prepared by the biotemplate and calcination method are promising photocatalysts for degrading organic dye wastewater.
关键词
石墨相g-C3N4/TiO2/多孔结构/异质结光催化剂Key words
graphite phase g-C3N4TiO2 porous structuretrapezoidal heterojunction photocatalyst引用本文复制引用
出版年
2024
NETL
NSTL
万方数据