Using Solid Phase Calcination Method Produce Tungsten Trioxide Photocatalyst

Photocatalysis is kind of catalyst which is used to split water into hydrogen and oxygen. The tungsten ions of tungsten trioxide due to oxygen vacancy so some part of W6 + ions will restore to W5 + ions, oxygen vacancy is the main reason for tungsten trioxide photocatalytic properties. However, due to variation in the valence of tungsten oxide, oxygen is difficult to determine, multi-phase transformation and electrical properties complex so it is hard to sure different crystalline forms of photocatalytic properties.

After several experts study found use solid phase clacination method with APT product WO3-X photocatalyst, mainly by the monoclinic phase, its poor performance on photocatalytic decomposition of water. However, after changing the reaction conditions, its photocatalytic performance can be greatly enhanced. For example, when heated at a temperature of 600 ℃ for 4 hours will produce hexagonal WO3-X, hexagonal WO3-X water photolysis has highest rate of oxygen evolution. With H2WO4 prepared by solid phase of WO3-X photocatalyst are monoclinic phase. And the temperature changes the photocatalytic properties change little. Therefore, using H2WO4 produce WO3-X photocatalyst is bad than using APT at atemperature of 600 ℃ produce WO3-X's.

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