Visible-light Photocatalytic Reduction Of Uranium（VI） Over C/TiO₂ And Cu₅（OH）₄（PO₄）₂

With the growing human demand for energy, countries stepped up efforts of the development and utilization of nuclear energy. But co-exist with the nuclear industry increasing in production during the mining of uranium of which generates radioactive waste, in order to make full use of uranium resources and control pollution of uranium,uranium-containing wastewater treatment have become a necessary part of proper national sustainable used of nuclear energy. For its photocatalytic technology capable of converting solar energy into chemical energy potential advantages attracted widespread attention. Traditional TiO₂ photocatalytic semiconductors material has non-toxic, high chemical stability, and low cost, but the larger band gap and a smaller solar energy utilization（about 5%）, limiting its photocatalytic reduction rate.Therefore, the conventional visible light absorption range of the catalyst is increased and seek new high stability, high activity and low cost visible light catalytic material is one of the hot research staff research.This paper by Sol-Gel and hydrothermal synthesis method prepared C/TiO₂ and Cu₅（OH）₄（PO₄）₂ two kinds of photocatalyst in response to highly active visible-light catalytic, and applied to the visible light catalytic uranyl ion experiment, the catalytic effect of light under different influencing factors, and by transmission electron microscopy（TEM）, Fourier transform infrared spectroscopy（FT-IR）, X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS） The catalysts were evaluated, the specific contents are as follows:1) Tetrabutyl titanate as titanium source, L-isoleucine as carbon source, PEG-2000 as a template, using the sol-gel synthesis of the compound semiconductor visible response C/TiO₂ and optimized in the preparation process The preparation conditions. At the same time through a variety of means material crystal structure,microstructure morphology and optical properties were characterized and analyzed. And the effects of C/TiO₂ photocatalysis activity under visible light irradiation of uranium（VI）. The results show that: the acidity of catalyst preparation is at 1.5, calcining at 450℃ when synthetic materials in the uranium solution p H=6.5, dosage of 0.6g/L has best catalytic effect, catalytic light duration70 min to reach equilibrium, while its light catalytic mechanism was discussed.2) Cu（NO3）2 as Cu source,（NH4）2HPO4 as P source, Cu₅（OH）₄（PO₄）₂ prepared by hydrothermal synthesis and characterization of the response to visible light photocatalyst, and investigated its radiation in visible light uranium（VI）photocatalytic effect. The results showed that: 10 catalyst acidity calcined at200 ℃ when synthetic materials in the uranium solution p H=6, dosage of 1g /L time best catalytic effect, catalytic light 50-60 min to reach equilibrium.