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The invention provides a wurtzite boron nitride / diamond composite material and a preparation method and application thereof, the composite material is composed of two phases of wurtzite boron nitride and diamond, and has a stacked sandwich microstructure, the sandwich microstructure comprises at least one first wurtzite boron nitride layer and at least one second wurtzite boron nitride layer, wherein the first wurtzite boron nitride layer is formed by wurtzite boron nitride; at least one second wurtzite boron nitride layer composed of wurtzite boron nitride; the composite material comprises a first wurtzite boron nitride layer, a second wurtzite boron nitride layer and a diamond layer, the diamond layer is arranged between the first wurtzite boron nitride layer and the second wurtzite boron nitride layer and is made of diamond, wurtzite boron nitride is a metastable phase stably existing under normal pressure, and the Vickers hardness of the composite material is larger than 50 GPa. The novel wurtzite boron nitride / diamond composite material disclosed by the invention has high hardness, high toughness and high thermal stability, and the preparation method disclosed by the invention is low in initial raw material price and simple in preparation process.

The application provides a wurtzite boron nitride / diamond composite material and a preparation method and application thereof. The composite material is composed of two phases of wurtzite boron nitride and diamond, and has a stacked sandwich microstructure, which comprises at least one first wurtzite boron nitride layer composed of wurtzite boron nitride, at least one second wurtzite boron nitride layer composed of wurtzite boron nitride, and a diamond layer composed of diamond and sandwiched between the first wurtzite boron nitride layer and the second wurtzite boron nitride layer. The wurtzite boron nitride is a metastable phase stably existing under normal pressure, and the Vickers hardness of the composite material is greater than 50 GPa. The novel wurtzite boron nitride / diamond composite material has high hardness, high toughness and high thermal stability, and the preparation method has low starting material price and simple preparation process.

The invention belongs to the technical field of high polymer materials, and relates to a C-H direct arylation polymerization method for synthesizing a conjugated polymer. The conjugated polymer is constructed through direct C-H arylation reaction under palladium catalysis, and the method has the advantages of being simple and safe in synthesis operation, high in regioselectivity and wide in substrate range. Besides, the prepared conjugated polymer realizes halogen atom retention, a space is provided for further functionalization of the polymer, and meanwhile, the carrier transport capability of the conjugated polymer is enhanced by the retained halogen atoms, so that the requirement of high carrier mobility of an organic electronic device is met.

The application provides a treatment method of lithium iron phosphate pyrolysis residue, and belongs to the technical field of lithium ion battery materials. The treatment method comprises the following steps: primary magnetic separation, reduction activation and secondary magnetic separation. Elemental iron is separated through the primary magnetic separation, and then the remaining non-magnetic residue is subjected to reduction activation, so that FeP / Fe2P is converted into weakly magnetic Fe3P, and then Fe3P is enriched and separated through the secondary magnetic separation. Through the multi-stage magnetic separation and reduction activation, iron and phosphorus in the lithium iron phosphate pyrolysis residue can be effectively separated and recovered, and the purity of the recovered product is high.