响应曲面法优化g-C3N4/MIL-100(Fe)光催化性能研究

Optimization of the Photocatalytic Performance of g-C_(3)N_(4)/MIL-100(Fe) by Response Surface Methodology

采用水热合成法制备了不同质量比的g-C_(3)N_(4)/MIL-100(Fe)复合光催化剂,利用XRD、SEM等方法对复合光催化剂进行了表征。在单因子实验的基础上,以亚甲基蓝溶液的降解率为响应因子,应用响应曲面法(RSM)对影响光催化亚甲基蓝(MB)降解率的主要因素进行了优化。创建了g-C_(3)N_(4)/MIL-100(Fe)光催化降解亚甲基蓝的二次多项式模型,并用响应面法进行优化。结果表明:在单因子实验中复合比例是对降解率影响较大的一项。初始质量浓度及复合比例的交互作用对亚甲基蓝的降解率影响最显著。模型预测最优条件为:初始质量浓度为9.37 mg·L^(-1)、pH=13、复合比例为1.43,在该条件下亚甲基蓝溶液的降解率最高为87.99%。

Theg-C_(3)N_(4)/MIL-100(Fe)composite photocatalysts with different mass ratios were prepared by hydrothermal synthesis,and the composite photocatalysts were characterized by XRD,SEM and other methods.Based on the single-factor experiment,taking the degradation rate of methylene blue solution as the response factor,the response surface method(RSM)was applied to optimize the main factors affecting the degradation rate of photocatalytic methylene blue(MB).A quadratic polynomial model was created for the photocatalytic degradation of methylene blue by g-C_(3)N_(4)/MIL-100(Fe).The results showed that the compound ratio in the single-factor experiment had a greater impact on the degradation rate.The interaction between the initial concentration and the compound ratio had the most significant effect on the degradation rate of methylene blue.The optimal conditions predicted by the model were as follows:the initial mass concentration 9.37 mg·L^(-1),pH=13,and the compounding ratio 1.43.Under these conditions,the degradation rate of methylene blue solution was 87.99%.