Crystalline CHFs polymer and preparation method thereof

The invention discloses a crystalline CHFs polymer and a preparation method thereof, and the preparation method comprises the following steps: in an inert atmosphere, uniformly mixing a benzonitrile monomer, a bromide salt and cyanamide, and synthesizing through an ionothermal method to obtain a brownish black block sample; and stirring, washing and drying the brownish black sample in distilled water to obtain the crystalline CHFs polymer material. The prepared crystalline CHFs polymer material has good crystallinity and photocatalytic activity, efficient photocatalytic hydrogen production performance is achieved under irradiation of visible light, CHFs have good chemical stability and can be recycled for multiple times, and effective preparation of clean energy H2 can be achieved. The raw materials are cheap and easy to obtain, and the preparation method is simple and can be applied to large-scale batch production. 本发明公开了一种晶态CHFs聚合物及制备方法，包括以下步骤：在惰性氛围下，将苯甲腈单体、溴化盐以及单氰胺混合均匀后，通过离子热法合成得到棕黑色块体样品；将棕黑色样品在蒸馏水中搅拌，洗涤，干