Visible light response type lanthanum-doped bismuth tungstate catalyst and preparation method thereof

Abstract

The invention provides a visible light response type lanthanum-doped bismuth tungstate catalyst and a preparation method thereof and belongs to the technical field of photocatalysis. The lanthanum-doped bismuth tungstate catalyst is prepared by carrying out solvothermal reaction on bismuth nitrate (Bi(NO3)3.5H2O), lanthanum chloride (LaCI3.7H2O) and sodium tungstate (Na2WO4.2H2O) in ethylene glycol to prepare sediment and washing and drying the sediment, wherein the doping ratio of lanthanum in the lanthanum-doped bismuth tungstate catalyst is 2 to 10 weight percent. The La-Bi2WO6 catalyst hasvery good photocatalytic performance and can be used for photocatalytically degrading organic pollutants, especially antibiotic pollutants. When the doping ratio of the La is 5 percent, the photocatalytic effect of the La-BiWO6 is the best. Under a simulated sunlight illumination condition of a 300W xenon lamp, the removal rate of the catalyst on tetracycline with the initial concentration of 30mg / L reaches 96.25 percent.

Description

Technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a visible light response type lanthanum-doped bismuth tungstate catalyst suitable for sewage treatment and a preparation method thereof, belonging to the technical field of photocatalysis. Background technique [0002] In recent years, the abuse of antibiotic compounds has led to different levels of detection of residues not only in water bodies, but also in soil and sediments. [1] . Antibiotic compounds usually have a shorter degradation half-life than POPs. However, due to the large-scale use of such substances in the animal husbandry and aquaculture industries, they are constantly supplemented in the environment, and they can achieve a "lasting" cumulative effect in the environment, so this antibiotic pollutant is called "false" persistent Pollutants [2-3] . [0003] The current domestic and foreign research on the actual degradation technology of tetracycline wastewat...

AI Technical Summary

Problems solved by technology

[0029] Aiming at the low efficiency of using a single bismuth tungstate photocatalyst to treat antibiotic wastewater, the present invention uses the special properties of rare earth lanthanum to propose a visible light-responsive lanthanum-doped bismuth tungstate catalyst to improve visible light catalytic technology To the removal efficiency of antibiotic in water body, in addition, the present invention also proposes the preparation method of above-mentioned catalyst

Images