Cu-doping modified TiO2 photocatalyst and preparation method thereof

Abstract

The invention discloses a Cu-doping modified TiO2 photocatalyst. The Cu-doping modified TiO2 photocatalyst grows on a copper-titanium alloy wire or bar base body and has a two-dimensional structure on the peripheral surface of the copper-titanium alloy wire or bar base body, and the structural unit of the Cu-doping modified TiO2 photocatalyst is a Cu-doping TiO2 nanotube. The invention also discloses a preparation method of the Cu-doping modified TiO2 photocatalyst. The preparation method can be used for directly growing a Cu-doping TiO2 nanotube array which has the two-dimensional structure and higher visible light response property on the copper-titanium alloy wire or bar base body through an electrochemical anode oxidation method. The Cu-doping TiO2 photocatalyst with the two-dimensional structure, which is disclosed by the invention, enlarges the specific area of a TiO2 photocatalyst and effectively extends the forbidden bandwidth of the TiO2 photocatalyst, thereby outstandingly enhancing the adsorptive capacity on a degradation product and obtaining the high-efficiency absorption on a solar spectrum; and the Cu-doping TiO2 photocatalyst is conductive to improving the visible light catalytic activity and has the advantages of good recoverability of the TiO2 photocatalyst, simple process, low cost and high controllable degree.

Description

technical field [0001] The invention relates to a titanium dioxide photocatalyst, in particular to a Cu-doped modified TiO with a two-dimensional (2D) structure 2 Nanotube arrays and methods of making them. Background technique [0002] Titanium dioxide (TiO 2 ) nanotube arrays have been widely used in the field of photocatalysis due to their excellent physical and chemical properties. However, due to TiO 2 The bandgap width of the solar cell is relatively wide, about 3.0eV~3.2eV, so that only less than 5% of the solar spectrum in the ultraviolet region can be absorbed and utilized, thus severely restricting its efficient absorption of sunlight. To overcome TiO 2 This defect makes it have better visible light response performance. Researchers from various countries have carried out extensive and in-depth research on this, and the most effective method is to change its electronic and energy band structure by means of doping. Such as transition metal elements (such as Cr,...

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Problems solved by technology

[0004] In order to overcome the chemical method to synthesize doped modified TiO 2 Due to the limitations brought by nanotubes, some researchers also prepared Cu-Ti and Fe-Ti alloy films on conductive glass substrates by magnetron sputtering, and then grown Cu-doped and Fe-doped films by electrochemical anodic oxidation. Modified Cu-Ti-O and Fe-Ti-O nanotube arrays, but this method is expensive and complicated, and the film quality is difficult to guarantee

There are also researchers who have prepared one-dimensional nanostructured TiO on TiTa, TiMn, TiZrNb and other alloy flake substrates. 2 nanotube array films, however, the one-dimensional nanostructures prepared by the above method with doped modified TiO 2 Nanotube arrays, the specific surface area is relatively small, therefore, it is still not conducive to the increase of the adsorption amount of catalytic degradation products and the efficient use of sunlight

[0005] In addition, in the nanostructured TiO that uses nanopowders, nanofilms, etc. as wastewater organic matter to degrade 2 When using photocatalysts, there are also problems such as complicated recycling and difficulty in reusing. Therefore, TiO with such nanostructures is limited. 2 The scope of application in the field of photocatalyst

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