响应面法优化La掺杂钒酸铋光催化剂的制备及降解四环素类抗生素

Optimization of La-doped Bismuth Vanadate Photocatalyst Preparation and Degradation of Tetracycline Antibiotics Using Response Surface Methodology

本文是以五水合硝酸铋[Bi(NO_(3))_(3)·5H_(2)O]、偏钒酸铵(NH_(4)VO_(3)),硝酸镧(La(NO_(3))_(3))为主要原料,采用水热法制备La-BiVO_(4)催化剂,光催化降解以盐酸四环素为模型反应的抗生素,通过紫外可见分光光度计,对盐酸四环素降解前后的吸光度进行测定进而得出降解率。主要研究了镧掺杂量、焙烧温度、焙烧时间等条件对La-BiVO_(4)光催化剂性能的影响。并用Box-Behnken响应面法设计优化实验条件,分析各影响因素间的交互作用。结果表明,当La的掺杂量为0.44 g、焙烧温度为503℃、焙烧时间为3.1 h时制备的La-BiVO4光催化剂降解盐酸四环素的降解率最佳,为76.69%。

This article uses bismuth nitrate pentahydrate[Bi(NO_(3))_(3)·5H_(2)O],ammonium metavanadate(NH_(4)VO_(3)),and lanthanum nitrate(La(NO_(3))_(3))as the main raw materials to prepare La-BiVO_(4)catalyst by hydrothermal method.The photocatalytic degradation of antibiotics using tetracycline hydrochloride as a model reaction is carried out.The absorbance before and after the degradation of tetracycline hydrochloride is measured using a UV visible spectrophotometer to determine the degradation rate.The main study investigated the effects of lanthanum doping amount,calcination temperature,calcination time and other conditions on the performance of La-BiVO_(4)photocatalysts.And use Box Behnken response surface methodology to design and optimize experimental conditions,and analyze the interaction between various influencing factors.The results showed that the La-BiVO_(4)photocatalyst prepared with a La doping amount of 0.44 g,calcination temperature of 503℃,and calcination time of 3.1 h had the best degradation rate of 76.69%for tetracycline hydrochloride degradation.