Biomass-assisted preparation method for synthesizing bismuth oxyhalide photocatalyst

The invention relates to a preparation method of a bismuth series photocatalyst and in particular relates to a biomass-assisted preparation method for synthesizing a bismuth oxyhalide photocatalyst. In a process of synthesizing bismuth oxyhalide, sodium carboxymethyl cellulose is added to generate BiOX-CMC, wherein X represents halogen. The bismuth oxyhalide photocatalyst with a 3D (Three Dimensional) structure can be formed, so that a better degradation effect is obtained. The sodium carboxymethyl cellulose used by the invention is a biomass derivative, has no toxic and harmful effects on human bodies and have very good environmental friendliness. The preparation method provided by the invention is simple in technology, easy to control and low in cost; compared with a conventional hydrothermal method, the preparation method has the advantage that the specific surface area is relatively greatly improved, so that the bismuth oxyhalide photocatalyst has a relatively good effect in a degradation process of rhoda