Nickel-doped Nano Bismuth Tungstate Catalyst

Bismuth tungstate nanometer is a kind of photocatalytic material with high efficiency, low toxicity and good stability. It is a typical Olivis oxide with perovskite-like WO₆ layer structure and narrow band gap (only about 2.80 eV). It can effectively remove organic pollutants in water by visible light photocatalysis. In the treatment of water pollution, Bi₂WO₆ nanometer is a typical perovskite-like oxide. It has important application value.

Metal doping can effectively regulate the energy band structure of Bi₂WO₆, broaden its visible light response range and improve the separation efficiency of photogenerated electrons and holes, thereby improving its photocatalytic activity. Some researchers have used nano bismuth tungstate catalyst doped with nickel, which greatly improves the specific surface adsorption capacity of the catalyst. The preparation process of nickel doped nanometer bismuth tungstate catalyst includes:

(1)Na₂WO₄·2H₂O was used to prepare 1-2mol/L sodium tungstate aqueous solution.

(2)The precursors of nickel-doped bismuth tungstate nanoparticles were prepared by adding NiCl₂·6H₂O and Bi(NO₃)₃·5H₂O into sodium tungstate aqueous solution. The molar ratios of Na₂WO₄·2H₂O, NiCl₂·6H₂O and Bi(NO₃)₃·5H₂O were 10:20 to 10:20.

(3)The precursor of nickel-doped nano bismuth tungstate catalyst was transferred to a high temperature and high pressure hydrothermal reactor with PTFE lining for hydrothermal reaction.

(4)Collect the products in step (3) and obtain Ni-doped nano bismuth tungstate visible-light photocatalyst after washing, centrifugation and drying.

The surface adsorption and photocatalytic activity of nickel-doped nano bismuth tungstate catalyst (Ni-Bi₂WO₆) were better than those of undoped Nano-Bismuth tungstate and titanium dioxide. When the pH value of water sample is less than 4, the photocatalytic activity of nickel-doped nano bismuth tungstate catalyst will be further enhanced, and the organic dye (Rhodamine B) can be completely removed within 30 minutes of photocatalytic reaction. At the same time, the catalyst is easy to obtain raw materials, simple preparation steps, mild preparation conditions, easy to implement, and has important application value in the treatment of organic dyes in wastewater.

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