g-C_(3)N_(4)/Co_(3)O_(4)的制备及其光催化降解四环素研究  

Preparation of g-C_(3)N_(4)/Co_(3)O_(4) and Its Photocatalytic Degradation of Tetracycline

作　　者：马馨月 陈雷 王芳芳 陈常东 MA Xinyue;CHEN Lei;WANG Fangfang;CHEN Changdong(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China)

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001

出　　处：《石油化工高等学校学报》2024年第5期56-64,共9页Journal of Petrochemical Universities

基　　金：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(No.2020703-8);辽宁省教育厅项目(LJKMZ20220736)。

摘　　要：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(NO_(3))_(2)·6H_(2)O)、尿素(NH4CNO)为原料,通过改变g-C_(3)N_(4)的加入量,制备了g-C_(3)N_(4)质量分数不同的g-C_(3)N_(4)/Co_(3)O_(4)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-C_(3)N_(4)与Co_(3)O_(4)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-C_(3)N_(4)质量分数为10%的g-C_(3)N_(4)/Co_(3)O_(4)对四环素的降解效果最佳,降解率为66.50%,高于纯Co_(3)O_(4)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(·O_(2)^(-))和空穴(h^(+));Co_(3)O_(4)与g-C_(3)N_(4)的复合,改善了Co_(3)O_(4)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-C_(3)N_(4) added,g-C_(3)N_(4)/Co_(3)O_(4) catalysts with different g-C_(3)N_(4) mass fractions are prepared based on the calcination method with cobalt nitrate hexahydrate(Co(NO_(3))_(2)•6H_(2)O)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-C_(3)N_(4) and Co_(3)O_(4) 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-C_(3)N_(4)/Co_(3)O_(4) is the best,with a degradation rate of 66.50%,which is higher than the degradation effect of single Co_(3)O_(4)(degradation rate of 35.90%).The active species of the catalyst are mainly superoxide radicals(·O_(2)^(-))and holes(h^(+)).After compounding with g-C_(3)N_(4),the drawbacks of Co_(3)O_(4) 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.

关 键 词：光催化 四氧化三钴 四环素 异质结 石墨氮化碳 

分 类 号：TQ123.4[化学工程—无机化工]