Nano Flake Tungsten Trioxide Photocatalyst

In recent years, with the rapid development of social economy, the impact of human activities on the earth has become more and more serious, making the pollution of the earth more and more serious, especially the water pollution. In order to solve this problem, people began to study photocatalyst, hoping that it can alleviate the environmental pollution.

In order to overcome the existing problems in the existing technology, some scholars have provided a nano flake tungsten trioxide photocatalyst with high efficiency. Its synthesis includes the following steps:

1)To prepare 0.5M C₆H₁₂O₆H₂ distillation solution, 0.5M Na₂WO₄·2H₂ distillation solution and 0.01M sucrose fatty acid ester distillation solution.

2)Mix the above solution in the proportion of C₆H₁₂O₆·H₂O: Na₂WO₄·2H₂O=2:1, stirring at 30 ℃ for 20 minutes. Then the distilled water solution of sucrose fatty acid ester with a volume ratio of 1% was added to the obtained solution and stirred for 20 minutes at 30%.

3)The pH of the above mixed solution is adjusted to 0.5 by HCl solution with concentration of 2M.

4)The homogeneous solution was poured into the PTFE lined high-pressure hydrothermal reactor, and the volume filling ratio was maintained at 35%.

5)Put the sealed reactor into the homogeneous hydrothermal reactor, set the temperature parameter to 150 ℃, and the reaction time to 30 h.

6) After the reaction, the final reactant was cooled to room temperature, centrifuged and separated, and washed three times with deionized water and absolute ethanol, respectively. After centrifugation and washing, the powders were dried in a vacuum oven at 40 ℃ for 20 hours, and the final product was obtained. The yield was 88%.

The photocatalytic degradation time of rhodamine B was 90 minutes under 1000W xenon lamp, and the degradation rate of nano flake tungsten trioxide photocatalyst was 92.5%. The degradation rate of commercial titanium dioxide is 45% under the same conditions. Compared with commercial titanium dioxide, the degradation rate of commercial titanium dioxide is higher and lower.

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