Catalyst for ozone oxidation of organic matters and preparation method of catalyst

Abstract

The invention relates to a catalyst for ozone oxidation of organic matters and a preparation method of the catalyst. The catalyst is prepared by the following steps: mixing multi-metal oxide, activated carbon, bentonite, a metal oxide adhesive and an activated carbon adhesive, wherein mass ratio of the multi-metal oxide to the activated carbon to the bentonite is 1:(0.2-5): (0.2-0.5), the mass of the metal oxide adhesive added during the mixing is 0.2%-5% of total mass of the multi-metal oxide, and the mass of the activated carbon adhesive is 0.2%-5% of the total mass of the catalyst; and after the mixing, carrying out mechanical granulation, drying particles, and carrying out microwave radiation, so as to obtain the finished product. The catalyst has the beneficial effects that by utilizing an ozone oxidation process of the organic matters, the ozone oxidation efficiency of the organic matters can be improved; and when the catalyst is applied to wastewater treatment, the wastewater COD removal efficiency of ozone is generally more than 45%, meanwhile, the B / C ratio of the wastewater can be increased, the decolorization ratio of the wastewater can be increased, and the service life of the catalyst is generally more than 5 years.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a catalyst for ozone oxidation of organic matter and a preparation method thereof. Background technique [0002] Ozone is a strong oxidizing agent that can oxidize organic matter. [0003] When no catalyst is used, ozone is selective for the oxidation of organic matter, and its ability to oxidize organic matter with a saturated bond structure is weak. It is easy to oxidize organic matter with an unsaturated bond structure to generate small molecule organic matter, but the reaction rate of ozone to small molecule organic matter is relatively low. Low, the efficiency of ozone to remove COD from wastewater is not high, it is only the improvement of the B / C ratio of wastewater. [0004] The process of using catalyst to oxidize organic matter with ozone is called ozone catalytic oxidation process, which combines the strong oxidation of ozone with the adsorption and catalytic charac...

AI Technical Summary

Problems solved by technology

However, activated carbon catalysts also have the problem of adsorption saturation. After using for a certain period of time, some micropores are blocked by organic matter, and the organic matter in the micropores is difficult to be oxidized and resolved by ozone or OH radicals, and the catalytic oxidation function is reduced. Short service life (generally 9 months), high cost of water treatment

[0006] Metal oxides such as manganese, titanium, aluminum, zinc, copper, and cobalt can be used as catalysts for catalytic oxidation of ozone. Ozone catalytic oxidation is selective, and some organic substances cannot be oxidized

At the same time, the metal oxide catalyst has a large pore size (greater than 50nm), small specific surface area, weak adsorption performance for organic matter, and limited catalytic oxidation efficiency. The efficiency of ozone to remove COD from wastewater is generally 30%.