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This invention belongs to the field of photocatalyst materials technology, specifically relating to a three-dimensional graphene aerogel photo-self-propelled Fenton catalyst, its preparation method, and its application. The preparation method includes: mixing a graphene dispersion containing ethylenediamine with a phenolic resin prepolymer containing ferrocene, phenols, and an alkaline catalyst; followed by a one-step hydrothermal reaction, washing, and freeze-drying to obtain the three-dimensional graphene aerogel photo-self-propelled Fenton catalyst. This catalyst can be used to degrade organic pollutants in water under visible light irradiation.

The application discloses a method for synthesizing 2,5-disubstituted pyrroline by a three-enzyme co-immobilization system, and adopts a one-pot cascade biocatalysis method to synthesize 2,5-disubstituted pyrroline. The co-immobilized enzyme obtained by co-immobilizing L-amino transferase, L-lactic acid dehydrogenase and glucose dehydrogenase on an amino resin ESQ-3 is used as a catalyst for a synthesis reaction, and a deep eutectic solvent formed by betaine and glucose is added to a synthesis system. The co-immobilized enzyme is prepared by a method that L-amino transferase is first immobilized on the amino resin ESQ-3, and then L-lactic acid dehydrogenase and glucose dehydrogenase composite particles obtained by ammonium sulfate precipitation are continuously immobilized. The synthesis method can obtain a higher stable conversion rate, and a product is easier to separate and purify. Enzymes and coenzymes are efficiently recycled, regenerated and reused. In addition, a reaction medium added with the deep eutectic solvent has a significant positive effect on solubility of a substrate, stability of the enzyme and mass transfer of the system, so that an immobilized enzyme method catalytic synthesis reaction system suitable for industrial application is effectively constructed.

The invention provides a growth method of a metal halide single crystal film, which comprises the following steps of: firstly, depositing a layer of blended polymer film with an orthogonal dissolution characteristic on the surface of a metal halide single crystal substrate as a sacrificial layer, and performing solvent treatment to form a self-patterning soft template; and then coating the polymer layer with a precursor solution of a target epitaxy, carrying out nucleation, transverse growth and grain combination to form a uniform and compact single crystal thin film, and completing mechanical stripping and transfer of the epitaxial thin film through a thermal stripping adhesive tape. The growth method provided by the invention has excellent universality, can grow various metal halide single crystal films including lead-based, non-lead-based, alloy and superlattice structures, and has wide adjustability in size and thickness; in addition, the prepared thin film shows high carrier mobility and low trap density which are equivalent to those of blocky single crystals.