Ytterbium-erbium co-doped Yb-Er/g-C3N4 photocatalyst as well as synthesis method and application thereof

The invention discloses an ytterbium-erbium co-doped Yb-Er/g-C3N4 photocatalyst as well as a synthesis method and application thereof. The preparation method comprises the steps: by taking melamine as a raw material, preparing g-C3N4 by adopting a high-temperature calcination method; and taking ytterbium oxide and erbium oxide as raw materials, and preparing Yb-Er/g-C3N4 by adopting a microwave-assisted heating method. According to the ytterbium-erbium co-doped Yb-Er/g-C3N4 photocatalyst prepared by the preparation method disclosed by the invention, the recombination of photon-generated carriers is inhibited, and the energy conversion efficiency can be effectively improved, so that the visible light and near-infrared light catalytic efficiency is improved. The ytterbium-erbium co-doped Yb-Er/g-C3N4 photocatalyst is used for degrading organic pollutants under irradiation of visible light and near-infrared light, and the Yb-Er/g-C3N4 has important practical application value in environmental purification and cl