Environmental-function nano material Cu-Fe/TiO2 nanotube array, and preparation and application thereof

Abstract

The invention discloses an environmental-function nano material Cu-Fe / TiO2 nanotube array, and preparation and application thereof. The preparation method of the Cu-Fe / TiO2 nanotube array comprises the following steps: preparing a TiO2 nanotube array by using an anodic oxidation process; depositing copper on the inside and surface of the TiO2 nanotube by using a pulse electrodeposition process, so that the Cu-TiO2 composite nanotube array has stronger adsorption capability and electronic conduction capability; and depositing iron nanoparticles on the inside of the Cu-TiO2 composite nanotube by using a pulse electrodeposition process, thereby increasing the concentration of hydroxyl free radicals in the photocatalytic reaction process. The electrodeposition of multiple metals by multiple steps is favorable for obtaining the uniformly-distributed granular photocatalytic nano material. The TiO2 nanotube array modified by iron and copper effectively widens the absorption range of TiO2 in visible light regions, reduces the photo-corrosion, enhances the photoelectric conversion efficiency, and shows excellent photocatalytic efficiency in the research on photocatalytic degradation of toxic organic pollutants and photo-reduction of heavy metal ions.

Description

technical field [0001] The invention belongs to the field of applied photocatalysis, and relates to a novel and highly efficient environmental functional nanomaterial--Cu-Fe / TiO 2 A new method for the preparation of nanotube arrays. Background technique [0002] Titanium dioxide nanotube arrays prepared by anodic oxidation have excellent characteristics such as large specific surface area and adjustable pore size. Its special nanotube-like structure has become a research hotspot in the scientific field of various countries. The electrolyte for preparing titanium dioxide nanotube arrays by anodic oxidation is usually an inorganic aqueous solution system. Since various ions migrate relatively fast in aqueous solution, the electrochemical anodic oxidation is also fast, and nanotube arrays can be formed in a relatively short time. However, the applied anodic oxidation voltage is generally only in the range of 10-25V, beyond this voltage range, the nanotube-like structure cannot...

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Problems solved by technology

However, the applied anodic oxidation voltage is generally only in the range of 10-25V, beyond this voltage range, the nanotube-like structure cannot be formed, which limits the diameter of the nanotube to a certain extent, and the nanotubes prepared in the aqueous solution system The tube wall is thin and easy to break

200410021589.X discloses a preparation method of titanium dioxide nanotube arrays with a high aspect ratio. The solute of the electrolyte is fluoride and supporting electrolyte, the solvent is water, and alcohol additives are added. This kind of nanotube is still relatively short, only 250 nanometers long, the specific surface area is not large enough, and it can only absorb light in the ultraviolet region, so it cannot make full use of natural sunlight.

At present, there is no report on the simultaneous modification of titanium dioxide nanotube arrays prepared by anodic oxidation with multiple elements at home and abroad.

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