Nickel Doped Tungsten Trioxide Catalyst

Bactericide wastewater is a typical kind of toxic and harmful industrial wastewater which is difficult to degrade, such as wastewater from pesticide industry and some chemical industry. Because of the high concentration of bactericide in wastewater, it can kill and inhibit the growth of microorganisms. On the other hand, most of the organic fungicides are polycyclic or heterocyclic organic compounds with poor biodegradability. Therefore, it is difficult to treat the bactericide wastewater directly by biotechnology.

In view of the weak photocatalytic activity of the existing WO₃ catalyst, the use of nickel doped tungsten trioxide catalyst can not only produce hydroxyl radicals by photocatalytic oxidation, significantly improve the removal rate of pollutants in wastewater, but also enhance the deep degradation of oxidation intermediates. The doping process is as follows:

A)Add tungsten powder to the H₂O₂ stirred by magnetic force at the speed of 200R / min. the molar ratio of tungsten powder and H₂O₂ is 1:4. Heat and stir continuously. With the rise of temperature, the color of milky white solution changes gradually. After heating for 2h, milky white solution becomes yellow sol-like substance, which is naturally cold to room temperature.

B)Add nickel acetate to CH₃OH stirred by magnetic force at the speed of 150r / min, heat and stir, wherein the molar ratio of Ni element in nickel acetate to w element in step a) is 1:5, the volume ratio of CH₃OH to H₂O₂ in step a) is 1:1, and the mass fraction of H₂O₂ is 30%.

C)Inject the solution obtained in step b) into the Yellow sol-like substance obtained in step a), heat and stir for 30min to obtain the gel, and then aging the gel for 0.5h.

D)Put the gel obtained in step c) into the oven, dry it at 105 ℃ for 30min, and then grind it into powder;

E)Put the powder obtained in step d) into the muffle furnace, heat it to 400 ℃ at the speed of 2 ℃ / min, and then burn it for 3 hours to obtain the nickel ion doped tungsten trioxide catalyst.

Tungsten trioxide catalyst doped with nickel ion has high activity. By doping WO₃ with nickel ion, its crystal structure, surface functional group and other properties can be changed to promote the decomposition of hydrogen peroxide in water to form a strong oxidizing hydroxyl radical and improve the catalytic effect on the intermediate products of small molecules. The catalyst has a wide range of application, and can be used for photocatalytic oxidation in the range of pH = 2 ~ 10 to remove sterilization pharmaceutical substances.

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