钙钛矿型LaCoO_(3)/g-C_(3)N_(4)异质结的构建及其光催化降解性能  

Perovskite LaCoO_(3)/g-C_(3)N_(4) heterojunction:Construction and photocatalytic degradation properties

作　　者：白颖琪 赵华[1] 李会鹏[1] 任欣然 李军 BAI Yingqi;ZHAO Hua;LI Huipeng;REN Xinran;LI Jun(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,抚顺113001

出　　处：《无机化学学报》2025年第3期480-490,共11页Chinese Journal of Inorganic Chemistry

基　　金：辽宁省教育厅项目(No.LJKMZ20220721)资助。

摘　　要：首先采用柠檬酸辅助溶胶-凝胶法制备钴酸镧(LaCoO_(3),LCO),并利用水热法制备LaCoO_(3)/g-C_(3)N_(4)(LCO/CN)p-n型异质结复合光催化剂。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(UV-Vis DRS)和光致发光(PL)光谱对LCO/CN进行了表征,评价了其对盐酸四环素(TC)的光催化降解性能,同时使用自由基捕获剂验证了光催化反应中起作用的活性基团,并推测了反应机理。结果表明,LCO和CN的复合显著增强了CN的光催化活性,当二者质量比为10%时制备的10%LCO/CN呈现出最佳的光催化性能,在120 min内对10 mg·L^(-1)TC的降解率高达96.2%,反应速率常数达到0.01893 min^(-1),分别是CN和LCO的3.04倍和1.93倍。3次循环回收实验结果显示,10%LCO/CN对TC的降解率下降得较少,表明该催化剂具有良好的稳定性和实用性。Lanthanum cobaltate(LaCoO_(3),LCO)was first prepared by the citric acid-assisted sol-gel method,and the hydrothermal method prepared LaCoO_(3)/g-C_(3)N_(4)(LCO/CN)p-n heterojunction composite photocatalysts.The LCO/CN was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),and photoluminescence(PL)spectroscopy.Its photocatalytic degradation of tetracycline hydrochloride(TC)was evaluated,and the reactive groups that play a role in the photocatalytic reaction were verified using free radical trappers and the reaction mechanism was hypothesized.The results showed that the composite of LCO and CN significantly enhanced the photocatalytic activity of CN,and the 10%LCO/CN prepared with a mass ratio of 10%of LCO to CN exhibited the best photocatalytic performance,with a high degradation rate of 96.2%of 10 mg·L^(-1)TC in 120 min,and a reaction rate constant of 0.01893 min^(-1),3.04-fold and 1.93-fold higher than that of CN and LCO,respectively.The results of three recycling experiments showed that the degradation rate of TC by 10%LCO/CN decreased less,indicating that the catalyst had good stability and practicability.

关 键 词：g-C_(3)N_(4) LaCoO_(3) 盐酸四环素 异质结 光催化 

分 类 号：O643.32[理学—物理化学]