Optimization of La-doped Bismuth Tungstate Photocatalyst Preparation and Degradation of Dye Wastewater Using Box-Behnken Response Surface Methodology
In this paper,bismuth nitrate pentahydrate(Bi(NO3)3·5H2O),sodium tungstate dihydrate(Na2WO4·2H2O)and lanthanum nitrate hydrate(La(NO3)3·n H2O)were used as the main raw materials to prepare La-Bi2WO6 catalyst by hydrothermal method,and photocatalytic degradation of dye wastewater using methyl orange as model reaction was studied,the absorbance of the model contaminant is measured to determine the rate of degradation by the visible photometer.The effects of Lanthanum doping amount,hydrothermal temperature and hydrothermal time on the performance of La-Bi2WO6 photocatalyst were studied.Box-Behnken response surface methodology was used to design and optimize the experimental conditions and analyze the interaction among the influencing factors.The result shows that the La-Bi2WO6 photocatalyst is the best when the La-doped content is 5.5％,the temperature is 178.69℃ and the time is 3.89 h.
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