The invention discloses a preparation method for a Bi2O3 / (BiO)2CO3
heterojunction catalyst with visible photocatalytic activity. The preparation method comprises the following steps: mixing and dissolving
bismuth nitrate pentahydrate or
bismuth citrate and
urea into deionized water, and carrying out
room temperature stirring to form a precursor solution; transferring the precursor solution into a high-pressure reaction kettle, preserving the temperature under 160 to 180 DEG C for 12 to 24 hours, and performing furnace cooling to
room temperature; washing the obtained
powder by deionized water and absolute ethyl
alcohol in sequence, and then performing
vacuum drying under the temperature of 80 DEG C to obtain (BiO)2CO3
powder; putting the (BiO)2CO3
powder under the temperature of 400 to 450 DEG C for calcining for 20 to 60min to obtain the Bi2O3 / (BiO)2CO3
heterojunction catalyst. The preparation method has the beneficial effects that
hydrothermal treatment is firstly carried out, and then calcining is performed to obtain a product. The preparation method is easy to operate, and the
equipment requirement is low; various complicated synthesis devices are not needed; the formation of a
heterojunction interface is favorable for transferring of photo-generated electrons and photo-generated holes and the improvement of the catalytic activity; the prepared heterojunction catalyst is higher in
photocatalysis performance than that of pure Bi2O3 and pure (BiO)2CO3.