关键词: 高岭石;g-C3N4;置换插层-煅烧法;罗丹明B;光催化

Abstract: With the rapid development of printing and dyeing industry , a lot of untreated wastewater containing rhodamine B were emitted directly , which does bad to environment because it is hardly to degrade naturally .g-C3 N4/kaolinite complexes were prepared by using the replacement intercalation-calcination method .The photocatalytic properties of the composites were investigated in the constant temperature simulation photocatalytic system .The catalytic mechanism was also being proposed in the paper.It is indicated that the contents of g-C3 N4 in samples 1g-C3 N4/K, 2g-C3 N4/K, 3g-C3 N4/K, 4g-C3 N4/K and 5g-C3 N4/K are increased, however, their degradation effect gets better at first and goes worse then.The highest activity of the photocatalyst is 4g-C3 N4/K whose catalytic rate is as high as 73％with 6 h light .The further study showed that light stimulates the semiconductor catalysts to generate electrons and holes which react with rhodamine B to form small molecule hydrocarbons or carbon dioxide and water.The hydrophilicity of the prepared g-C3 N4/kaolinite complexes was so excellent that they can dissolve in dye solution which promote the photocatalytic process and degrade rhodamine B more efficiently .

Key words: kaolinite;g-C3 N4;intercalation-calcination method;rhodamine B;photocatalysis