Photocatalytic Reduction of CO2 in Cu-doped TiO2 Nanotubes
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TiO2 nanotubes can be fabricated by anodization, and copper doped TiO2 nanotube composites can be obtained by electrodeposition. X-ray energy spectrum analyzers, scanning electron microscopes, and X-ray powder diffractometers were used to test the resulting material in all aspects. The results show that the TiO2 nanotubes obtained by the anodization method have an average diameter of about 90 to 110 nanometers and an average tube length of about 300 nanometers, belonging to the anatase type; and the TiO2 doped copper obtained by the electrodeposition method. The copper in the composite material (which is mainly composed of CUXOY/TiO2) is mainly in the form of copper. The photocatalytic reduction of TiO2 nanotubes made from different concentrations of CuSO4 electroplating baths must be performed in a sealed, suspended photocatalytic system. Under the illumination of a 500-watt deuterium lamp, the product of the reduction of CO2 by CUO/TiO2 and TiO2 is methane and carbon monoxide; under the light conditions of 6 hours, the yield of methane produced by TiO2 nanotubes can reach 1.3x10-6/(cm2). • h), but with 0.04 moles of copper sulfate per liter under the same conditions of CUO/TiO2 nanotubes, the methane production can actually reach 3.7x10-6/(cm2•h), which intuitively shows the CUO/TiO2 nanometer tube plays a very significant role in improving the photocatalytic reduction efficiency of CO2.
TiO2 nanotubes, Copper doping photocatalytic reduction methane.