Silver surface modified mixed crystal type titanium dioxide nano-net photo-electro-catalytic composite material

Abstract

The invention provides a silver surface modified mixed crystal form titanium dioxide nano-net photo-electro-catalytic composite material. The preparation method comprises the following steps: placinga titanium mesh serving as an anode and a platinum sheet servng as a cathode in an electrolyte, and carrying out an anodic oxidation reaction to obtain a titanium dioxide nano-net array of a titaniummesh substrate; and putting the titanium dioxide nano-net array of the titanium net substrate into an ethanol solution dissolved with silver nitrate for dipping treatment, taking out the titanium dioxide nano-net array, drying the titanium dioxide nano-net array, and then carrying out heat treatment to obtain the silver nanoparticle surface modified mixed crystal form titanium dioxide nano-net photo-electro-catalytic composite material. The ethanol solution of silver nitrate is used as a silver source for surface modification, and amorphous titanium dioxide does not fall off in ethanol. Silvernano-particles are deposited on a titanium dioxide nano-net, and part of crystal lattices are occupied, so the band gap width of TiO2 can be reduced, and the photo-electro-catalytic activity is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of photo-electric combined catalytic materials, and relates to a photo-electrocatalytic composite material of mixed crystal titanium dioxide nano-network with silver surface modification. Background technique [0002] TiO 2 Due to its biochemical inertness, non-toxicity, low cost, and corrosion resistance, it is regarded as a suitable photocatalytic material for environmental pollution treatment, and has been widely used in the degradation of harmful substances and water pollutants. However, due to TiO 2 The wide bandgap width of photocatalysts (3.0-3.2eV) leads to low utilization rate of visible light, and can only be excited by ultraviolet light to generate electron-hole pairs. The electrocatalytic oxidation technology currently used for sewage treatment has multiple functions such as oxidation, reduction, neutralization, coagulation, and air flotation. No drugs are added during the treatment process, no ...

AI Technical Summary

Problems solved by technology

The present invention uses the ethanol solution of silver nitrate, which can perfectly solve the problem of amorphous TiO 2 It is easy to break and fall off in water. The use of 200-mesh titanium dioxide nano-mesh greatly increases the specific surface area, and the nano-mesh is a block material, which is easy to replace and will not cause secondary pollution.

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