Visible-light response bismuth magnesium-graphite-like carbon nitride composite photocatalyst and preparation method thereof

The invention discloses a visible-light response bismuth magnesium-graphite-like carbon nitride composite photocatalyst and a preparation method thereof, and belongs to the field of inorganic nano photocatalytic materials. The preparation method comprises the following steps: preparing tripolycyanamide into g-C3N4 powder through a heat polycondensation method; adding an appropriate amount of the g-C3N4 powder into the mixed water solution of magnesium chloride and sodium bismuthate to stir sufficiently; moving into a reaction kettle to carry out hydrothermal reaction so as to prepare the bismuth magnesium-graphite-like carbon nitride composite photocatalyst. The preparation method provided by the invention is simple, easy to operate, energy-saving and low in cost; the prepared composite photocatalyst has a moderate energy gap, can be used for restraining the compounding of the photo-generated electrons and holes more effectively, shows excellent photocatalytic performance, has the advantage of effectively and photocatalytically degrading the organic pollutants under the irradiation of visible light, and has relatively good economic benefit, social benefit and ecological benefit.