g⁃C3N4/Co3O4的制备及其光催化降解四环素研究

Preparation of g⁃C3N4/Co3O4 and Its Photocatalytic Degradation of Tetracycline

马馨月 陈雷 王芳芳 陈常东

Xinyue MA Lei CHEN Fangfang WANG Changdong CHEN

辽宁石油化工大学 石油化工学院，辽宁 抚顺 113001

School of Petrochemical Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China

利用太阳能光催化降解污染物，是解决水污染问题并实现太阳能转化最有前途的技术之一。应用煅烧法，以六水合硝酸钴（Co（NO3）2·6H2O）、尿素（NH4CNO）为原料，通过改变g-C3N4的加入量，制备了g-C3N4质量分数不同的g-C3N4/Co3O4催化剂；利用X射线衍射（XRD）、X射线光电子能谱（XPS）、紫外-可见吸收光谱（UV-vis DRS）测试，对催化剂进行了分析和表征；为推测催化剂的活性物种，对其进行了捕获剂实验。结果表明，g-C3N4与Co3O4的协同作用可提高两相界面间载流子的转移和分离效率；在可见光下，g-C3N4质量分数为10%的g-C3N4/Co3O4对四环素的降解效果最佳，降解率为66.50%，高于纯Co3O4对四环素的降解率（35.90%）；催化剂的活性物种主要为超氧自由基（·O2-）和空穴（h+）；Co3O4与g-C3N4的复合，改善了Co3O4电子-空穴对复合过快、带隙小和光吸收能力弱等不足，为今后有机污染物的降解提供了思路。

The use of solar photocatalytic degradation of pollutants is one of the most promising technologies to solve water pollution problems and achieve solar energy conversion. By changing the amount of g-C3N4 added, g-C3N4/Co3O4 catalysts with different g-C3N4 mass fractions are prepared based on the calcination method with cobalt nitrate hexahydrate (Co（NO3)2-6H2O) and urea (NH4CNO) as raw materials. The samples are analyzed and characterized using X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and ultraviolet visible absorption spectroscopy （UV-vis DRS）. To speculate on the active species of the catalyst, capture agent experiments are conducted on it. The results indicate that the synergistic effect between g-C3N4 and Co3O4 can improve the transfer and separation efficiency of charge carriers at the interface between the two phases. Under visible light, the degradation effect of 10% g-C3N4/Co3O4 is the best, with a degradation rate of 66.50%, which is higher than the degradation effect of single Co3O4 （degradation rate of 35.90%）. The active species of the catalyst are mainly superoxide radicals（·O2-） and holes（h+）. After compounding with g-C3N4, the drawbacks of Co3O4 electron hole pair, such as too fast recombination and a deficient energy level structure, are improved, providing ideas for the degradation of organic pollutants in the future.

国家留学基金委公派访学学者面上项目(CSC202008210025);教育部“春晖计划”合作科研项目(2020703?8);辽宁省教育厅项目(LJKMZ20220736)

10.12422/j.issn.1006-396X.2024.05.007