Bismuth Tungstate Porous Single Crystal Photocatalyst

Bismuth tungstate is a typical mixed metal oxide, which has a series of advantages such as absorbable visible light, low cost and good stability. It has been widely studied in photocatalysis. However, the photocatalytic activity of bismuth tungstate crystals is low due to the high photoelectron and hole recombination rate in the bismuth tungstate crystal. Therefore, by modifying the structure of bismuth tungstate, reducing the recombination of photo generated electrons and holes, it is of great significance for improving the efficiency of photolysis of water to produce oxygen.

Semiconductor mesoporous single crystal materials not only have high specific surface area, high load capacity and mass transfer ability of porous materials, but also have excellent charge transport ability, high catalytic activity and chemical stability of single crystals. These excellent physical and chemical properties make semiconductor porous single crystal materials have wide application prospects in solar cells, catalysis, lithium batteries and biosensors. The preparation of porous bismuth tungstate single crystal can improve the activity of degradation of pollutants by constructing porous single crystal structure.

Using the method of hydrothermal synthesis, molby 2:1 bismuth nitrate and sodium tungstate to nitrate in aqueous solution of 1.6M stirring, obtain the bismuth tungstate precursor acid; silica nanospheres will be added to the dipping bismuth tungstate precursor solution of the acidification in 4 hours, get acidified silica nanospheres template; The acidified SiO2 nanospheres template was put into acidic aqueous solution containing amorphous bismuth tungstate, and then heated for 18 hours at 240 degrees. The bismuth tungstate single crystal containing silica nanoparticles was obtained. At last, bismuth tungstate single crystal containing silicon dioxide nanospheres was etched by 0.5M sodium hydroxide solution, and bismuth tungstate porous single crystal was obtained.

The bismuth tungstate porous single crystal photocatalyst can be used for the degradation of organic pollutants, and the specific efficiency of decomposing tungstic acid is more than twice that of the single crystal of bismuth tungstate, and the prepared porous single crystal of lanthanum tungstate is higher than the single crystal of bismuth tungstate. The photocatalytic water-reducing oxygen-generating activity can efficiently treat the herbicides 2,4‐D, or phenol, methylene blue, rhodamine B, methyl orange, heavy metal ion chromium, lead, and mercury ions, etc.

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