Copper/Bismuth Tungstate Composite Photocatalyst

Bi₂WO₆ has a narrow visible light response range, easy recombination of photogenerated electrons and holes, short lifetime, low visible light utilization and photocatalytic activity. In view of the defects of Bi₂WO₆ photocatalytic materials, modification of Bi₂WO₆ photocatalytic materials and development of new materials with high photocatalytic activity and stable photocatalytic performance are the key to practical application.

Bismuth tungstate can be compounded with many metal materials, such as gold, silver, copper, iron, platinum and titanium. This paper mainly introduces the copper/bismuth tungstate composite photocatalyst. The synthesis steps are as follows:

1.Dissolve Bi(NO₃)₃·5H₂O in HNO₃ solution, add (NH₄)·10W1241·5H₂O solution, stir for 2 hours, then transfer it into stainless steel reactor, seal it and put it into electrothermal constant temperature blast drying box to react for 2-12 hours at 140-200 ℃. After reaction, natural cooling to room temperature, centrifugal separation, washing, vacuum at 60-100 ℃. Bi₂WO₆ powder was obtained after drying for 1-3 hours.

2.The obtained bismuth tungstate powder was dispersed in deionized water, then dripped with CuSO₄ aqueous solution. After 30 minutes of magnetic stirring, ascorbic acid aqueous solution was added to the mixed solution drop by drop, and then stirred for 20-40 minutes. The obtained suspension was transferred to the stainless steel reactor, sealed, and reacted at 180-200 degrees for 7-12 hours, then cooled naturally to the stainless steel reactor. Copper/bismuth tungstate composite photocatalytic materials were prepared by centrifugal filtration, washing and vacuum drying at 60-100 ~℃ for 6-12h. The photocatalyst can be used to treat methyl orange wastewater.

The copper/bismuth tungstate composite photocatalyst synthesized by the above method has no agglomeration, large specific surface area, wide visible light response range, significantly higher catalytic activity than bismuth tungstate, and good reusability. A small amount of the sample is placed in methyl orange solution, and the photocatalyst is decomposed by visible light provided by 300 W xenon lamp. The photocatalyst is 120 W. The degradation rate of methyl orange was 81.5%, and the effect was ideal.

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