Photocatalytic technology can use photogenerated electrons to reduce easily soluble U(Ⅵ)to insoluble U(Ⅳ).In this work,hierarchical macro/mesoporous g-C3N4-TiO2 composites were synthesized without the introduction of organic templates or auxiliary additives,and were used for photocatalytic reduction of U(Ⅵ).The morphology,structure and optical properties of g-C3N4-TiO2 composites were studied by X-ray diffractometer(XRD),scanning electron microscope(SEM),automatic specific surface area physical adsorption instrument(BET),ultraviolet-visible diffuse reflectance spectrometer(UV-vis DRS)and other advanced characterization equipment.The photocatalytic reduction of U(Ⅵ)of g-C3N4-TiO2 composites was studied by photocatalytic experiments.The results show that g-C3N4-TiO2 composites have the advantages of hierarchical macro/mesoporous TiO2 and g-C3N4,not only have a large specific surface area(174.68 m2/g)and pore channels,but also have a wider light absorption range.Therefore,the removal rate of g-C3N4-TiO2 composites on U(Ⅵ)is as high as 98.4％within 15 min.This work provides new ideas for the treatment of uranium-containing radioactive wastewater.
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