Bismuth Tungstate / Polyaniline Composite Photocatalyst

The modification methods of bismuth tungstate can be used in various ways. Researchers have provided a method for the preparation of bismuth / polyaniline composite photocatalyst with a simple process and excellent product performance. It is said that the composite photocatalyst has a good effect on the treatment of methylene blue in sewage.

(1) The preparation process of bismuth tungstate / polyaniline composite photocatalyst is that the Na₂WO₄ solution is added to Bi (NO₃)₃ solution, and the mixing reaction is sufficient at room temperature. In the stirring condition, adding NaOH solution to the mixture to adjust the acid-base property and transferring to the reaction kettle to carry out the hydrothermal reaction; the product after the reaction is distilled water and anhydrous. Bismuth bismuth powder was prepared by washing with ethanol and drying at 60°C.

(2) The bismuth tungstate powder and polyaniline were compounded: 0.009g polyaniline (PANI) was added to NMP (N- methyl pyrrolidone) of 20mL (PANI, 0.45g/L) and ultrasonic 30min to make it dispersed evenly. Then, according to the different mass ratio of PANI/Bi₂WO₆, the Bi₂WO₆ powder was dispersed in the concentration of 0.45g/L polyaniline organic solution, the ultrasonic was about 30min, then 6h was stirred, the centrifuge was washed, and the final product of bismuth tungstate / polyaniline powder was obtained.

0.02g, bismuth tungstate / polyaniline powder was dissolved in the 10mg/L methylene blue solution of 20mL, 2h was irradiated under the light source of lambda =365nm, and the centrifuge supernatant was tested with UV visible spectrometer. When the wavelength range was 200nm-800nm and the mass ratio of PANI/Bi2WO6 was 1%, the prepared bismuth / polyaniline heterojunction photocatalyst was prepared. The photodegradation rate of methyl blue is the highest, reaching 82.5%.

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