Preparation method of nickel ferrite based magnetic loaded type titanium dioxide photo-catalyst

Abstract

The invention provides a preparation method of nickel ferrite based magnetic loaded type titanium dioxide photo-catalyst with micron grade micron order as carrier; the preparation process includes the following steps: adding green copperas solution and oxalic acid solution into the nickel salt solution for reaction to obtain the mixture precipitate of oxalate of nickel oxalate and iron oxalate; then baking to obtain the micron grade nickel ferrite powder; adding the titanic sulfate solution into the suspension of micron grade nickel ferrite powder so as to crystallize the titanium ions on the suspended particulates in the suspension to form a wrapping layer and obtain the nickel ferrite based magnetic loaded type titanium dioxide photo-catalyst product. The magnetic loaded type titanium dioxide photo-catalyst prepared by the method of the invention has good dispersibility; and the particle diameter of the particles is about 5 mum; the titanium dioxide is obviously wrapping on the surface of the nickel ferrite to form a core / shell structure with large wrapping capacity as well as adjustable and homogenous distribution; the specific surface is 90-110 m / g; and the photo-catalyst has the feature of strong soft magnetism, can be rapidly recycled in aqueous solution and has higher catalytic activity, so that organic wastewater can be completely degraded. The preparation technology is simple, the cost is low, and large-scale production is easily realized.

Description

technical field [0001] A method for preparing a nickel ferrite-based magnetically supported titanium dioxide photocatalyst, in particular to a nickel ferrite based magnetically supported TiO that can degrade organic pollutants 2 The preparation method of photocatalyst powder. Background technique [0002] Nano TiO 2 As an emerging organic pollutant treatment technology, photocatalytic technology as a catalyst has the characteristics of fast treatment speed, no selectivity in degradation, simple equipment, convenient operation, no secondary pollution, and good treatment effect. It can be used in antifouling, antibacterial , deodorization, air purification, water treatment and environmental pollution control are widely used. However, nano-TiO 2 The use of organic sewage treatment is still in the basic research of the laboratory and cannot be applied industrially. One of the key problems is the existing methods of loading various catalysts, such as loading photocatalysts on ...

AI Technical Summary

Problems solved by technology

The powder loading method that has been reported to have a better effect is mainly the sol-gel-dipping method, which can prepare relatively smooth and flat catalyst films on the surface of different powders. It has good firmness and good universality, and has been widely used.

However, in the prior art, since the magnetic materials prepared by the chemical co-precipitation method are all nano-scale powders, and the composite powders are also submicron / nano-scale, they are easy to agglomerate and agglomerate during washing, drying and roasting, and are not easy to be dispersed. powder with good properties, thus suppressing TiO 2 fully play its role, and the magnetic material is coated with TiO 2 or SiO 2 After that, the magnetism is obviously reduced or even disappears, and the recycling ability is weakened.

Nano-TiO was prepared by sol-gel-dipping method 2 Photocatalyst film, TiO 2 The load capacity is limited, multiple loads are required, the relative specific surface area is small, and the adsorption capacity is poor, which affects the photocatalytic efficiency

Images