Doped Tungstate Application

Doped tungstate is the use of chemical or physical means to embed particles on the main lattice of catalyst, introduce new electronic center and new charge into the lattice, form lattice defects and change the type of lattice, adjust or change the energy band structure of catalyst to affect the movement of photogenerated electrons and holes, and ultimately lead to the change of photocatalytic activity of catalyst.

Although metal element doped tungstate can cause lattice expansion and crystal deformation of tungstate to a certain extent, it can reduce the crystallinity of tungstate, but a proper amount of metal element doping can improve the surface structure and catalytic performance of the catalyst. SN₂ + doped ZnWO₄ nano photocatalyst was successfully synthesized by microwave hydrothermal method. The experimental results show that SN₂ ⁺ doping amount is 0.451 photocatalysis. The reason is that doping metal ions will increase the surface defects and active surface area of the semiconductor catalyst, which is conducive to the transfer of photogenerated electrons, thus reducing the compound probability of electron hole pairs and improving the photocatalytic activity. The micro Ag particles dispersed on the surface of ZnWO₄ can capture electrons, so that photogenerated electrons can easily migrate from the inside of the catalyst to the surface of ZnWO₄, promoting photogenerated electrons. The photocatalytic activity of ZnWO₄ can be doubled by 1 wt% Ag doping.

In recent years, more and more attention has been paid to the photocatalysis of doped tungstate. The f-znwo4 photocatalyst was synthesized by hydrothermal method. After fluorine doping, the zinc tungstate photocatalyst was synthesized. Compared with undoped ZnWO4, the photocatalytic activity of f-znwo4 is increased by 2.6 times, and the acceleration of electron transfer rate is the main reason to improve the catalytic activity. The results show that the chlorine doped zinc tungstate (Cl-ZnWO₄) also has excellent photocatalytic effect, and CL-ZNWO₄ has good photocatalytic activity. The photocatalytic activity of N-Bi₂WO₆ can be improved to a certain extent by adding a certain amount of hydrogen peroxide to the photodegradation experiment, which can react with the conduction band electrons to generate more hydroxyl radicals.

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