The invention discloses a hetero-junction catalyst based on
halloysite as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic
water treatment. According to the preparation method, natural
halloysite is taken as a carrier, and a ternary
heterojunction with a synergistic effect of BiVO4 and MIL-100 is constructed on the surface of the natural
halloysite by virtue of an in-situ loading and hydrothermal compounding process, so that the BiVO4-coated MIL-100-coated HNT
heterojunction catalyst is prepared. According to the catalyst,
active phase agglomeration is inhibited through a halloysite tubular structure,
photon-generated carrier separation is promoted through energy band matching of BiVO4 and MIL-100, and generation of active species is strengthened through Fe < 2 + > / Fe < 3 + > valence cycle of MIL-100; under the synergistic effect of visible light and H2O2, active species such as hydroxyl free radicals are efficiently generated through a
photocatalysis-Fenton-like
coupling mechanism, and
phenol pollutants such as
resorcinol and the like and
refractory pollutants such as 1H-
benzotriazole and
polyethylene glycol in photovoltaic
wastewater can be rapidly and thoroughly mineralized; the blank of the ternary composite
heterojunction catalyst in the field of photovoltaic
wastewater treatment is filled, the ternary composite heterojunction catalyst has the characteristics of low cost and environment friendliness, and a feasible technical scheme is provided for green and efficient treatment of photovoltaic
wastewater.