2020年12月1日星期二

Zinc Tungstate / Bamboo Charcoal Composite Photocatalyst

In recent years, tungstate catalysts have attracted more attention for their narrower band gap and larger visible light range.

Zinc tungstate (ZnWO4) is a very representative tungstate material. As an efficient photocatalyst, ZnWO4 has excellent catalytic activity, good stability, low energy consumption and no secondary pollution, it has a wide range of applications in environmental protection, water treatment and many other fields. But inevitably, zinc tungstate, like bismuth tungstate, titanium dioxide and other photocatalysts, is easy to agglomerate and difficult to recover in practical applications, therefore, searching for an effective carrier is an effective way to improve photocatalytic performance and reduce the amount of zinc tungstate.

Bamboo charcoal is a three-year-old alpine bamboo as raw material, by nearly 1000 degrees high temperature firing from a charcoal. Bamboo charcoal has porous and porous structure, its molecule is fine and porous, the raw material is easy to regenerate, has strong adsorption ability, can purify the air, eliminate the peculiar smell, is the ideal material to serve as the carrier of zinc tungstate.



The molar ratio of ammonium paratungstate, zinc nitrate and citric acid was mixed with the molar ratio of 1: 1: 2, and the mixture was stirred in a constant temperature water bath at 85 °C. The dispersed bamboo charcoal was poured into the above solution and stirred for 10 min, and then with 7.28 mol / L ammonia water solution pH = 2.0 ~ 3.0 constant temperature stirring to the solution was gel-like, the sol transferred to the beaker, into the microwave oven, microwave oven power 640 W, microwave 10 min, and then in the box-type resistance furnace at 400 °C for 2 h, remove the grinding, the powder over 100 mesh sieve, that was ZnWO4 / bamboo charcoal composite materials.

After the composite of zinc tungstate / bamboo charcoal composite catalyst showed great photocatalytic activity, some enterprises use composite catalyst degradation rhodamine B, when the content of bamboo charcoal was 20%, the bamboo charcoal exhibited the maximum photocatalytic activity, and the degradation effect reached 92%.

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