The preparation method of copper phosphotungstic acid is as follows: Weigh a certain amount of solid phosphotungstic acid, add a certain volume of water and ethanol, slowly add copper nitrate under constant stirring, and continue stirring for 1 hour to make it undergo metathesis reaction, and then heat to 80 ℃, remove alcohol and part of the water, cool down to room temperature, crystallize, age, filter, and dry at 120℃ for 2 hours to obtain copper phosphotungstate.
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