以硝酸钴、硝酸镧及柠檬酸为原料，采用水热合成法制备4种不同物质的量的比的钙钛矿型催化剂LaCoO₃。利用XRD、SEM、TEM、FT-IR、XPS、H₂-TPR等表征手段对合成的钙钛矿型催化剂LaCoO₃进行物化性质表征，并以盐酸四环素（TCHC）为目标降解物，在可见光照射下进行光催化降解反应，并分析光催化降解机理。结果表明，4种催化剂对TCHC的降解率均达到80%以上，在20℃下可见光照射1 h后，n[La （NO₃）₃]∶n[Co （NO₃）₂]∶n（柠檬酸）=1∶1∶6的LaCoO₃催化剂对TCHC的降解效果最好，降解率达到89.29%。

LaCoO₃ perovskite catalysts with four different molar ratios are prepared through hydrothermal method by using cobalt nitrate,lanthanum nitrate and citric acid as raw materials.XRD,SEM,TEM,FTIR,XPS and H₂-TPR are employed to characterize the physicochemical properties of the catalysts.Taking tetracycline hydrochloride (TCHC) as the target product,the photocatalytic degradation reaction over the catalyst is carried out in the presence of visible light,and the photocatalytic degradation mechanism is also explored.Experimental results show that the degradation rates of TCHC over four kinds of catalysts all exceed 80%.LaCoO₃ catalyst with a LaNO₃:CoNO₃:citric acid ratio of 1:1:6 has the best degradation effect on TCHC after visible light irradiation at 20℃ for 1 hour,delivering a degradation rate of 89.29%.

牛紫嫣(1995-),女,硕士研究生,研究方向为光催化,827507197@qq.com