Method for preparing rare earth perovskite/biochar composite material from forestry and agricultural residues and application of rare earth perovskite/biochar composite material

Abstract

The invention belongs to the field of green synthesis of carbon-based composite materials, and particularly relates to a method for preparing a rare earth perovskite / biochar composite material from forestry and agricultural residues and application of the rare earth perovskite / biochar composite material. The method comprises the following steps: cleaning, drying and grinding forestry and agricultural residues, adding the ground forestry and agricultural residues, rare earth nitrate and transition metal nitrate into deionized water in proportion, and conducting heating and stirring in a water bath to obtain turbid liquid; dropwise adding ammonia water to adjust the pH value to be neutral, and conducting drying and grinding to obtain powder; and calcining the obtained powder in a muffle furnace, conducting grinding to obtain the rare earth perovskite / biochar composite material. The rare earth perovskite / biochar composite material is applied to photocatalytic synthesis of ammonia. A two-dimensional biochar nanosheet loaded rare earth perovskite composite material is prepared from rich forestry and agricultural residues in nature as raw materials by a solution combustion method at a low temperature, and has the advantages of good dispersibility, low raw material cost, simple and convenient synthesis method and the like, and the prepared rare earth perovskite / biochar composite material has an excellent photocatalytic synthesis ammonia effect.

Description

Technical field

[0001] The present invention belongs to the field of green synthesis of carbon-based composite, and more particularly to a method of preparing a rare earth calcium ore / biocarbon composite material in a low temperature waste biomass, low temperature and its application in ammonia in photocatalytic nitrogen synthesis.Background technique

[0002] The traditional iron-based catalyst Haber-Bosch process has been widely used in nitrogen synthesis ammonia, but the reaction needs to be carried out under high temperature and high pressure, and the energy consumption is huge, and today, it is urgent to find a new one. Synthetic ammonia method.

[0003] In recent years, solar photocatalytic technology has been used to transform solar energy into chemical energy, and the ammonia to achieve light solid nitrogen synthesis is concerned. At present, there is only an absorption of absorption of ultraviolet light in the ultraviolet portion, and the development of catalysts that have catalyti...

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