A kind of preparation method of ternary eutectic ozonation catalyst for wastewater treatment

Abstract

The invention discloses a preparation method of a ternary co-crystallized ozone oxidation catalyst for wastewater treatment. The method comprises the following steps: dissolving three catalysis active components of iron, manganese and nickel in water according to a specific molar ratio to prepare a co-crystallization mixed mother liquor, adding a gamma-Al2O3 molecular sieve into the mixed mother liquor, adopting a constant temperature dipping technology at 20DEG C to make the three effective components in the mother liquor uniformly adsorbed to the surface of the gamma-Al2O3, carrying out 120DEG C microwave drying pretreatment, and carrying out 150DEG C crystallization co-precipitation, 20min rapid heating and 550DEG C heat digestion in a high temperature microwave sintering furnace to prepare the supported ternary co-crystallized ozone oxidation catalyst. The preparation method is simple and efficient, the three active components on the surface of the catalyst exist as a cocrystal, and the catalyst has a good ozone oxidation catalysis effect, extremely high compactness, high binding fastness with a base material, chemical corrosion resistance, and effective solving of the catalyst loss problem.

Description

[0001] field of invention [0002] The invention relates to a preparation method of a ternary co-crystallized ozone oxidation catalyst used for wastewater treatment. [0003] technical background [0004] At present, the advanced oxidation method is an effective method to treat complex organic waste water, but its large-scale application is hindered by factors such as insufficient oxidation capacity of oxides, low degradation efficiency of organic matter, and high treatment costs. Ozone has strong oxidizing properties, and can oxidize and degrade many complex organic substances by releasing ozone free radicals in water. But the half-life of ozone is long, the solubility in water is low, a large amount of ozone exists in the form of bubbles, these bubbles stay in water for a short time, and the floating speed is fast, so it is difficult to make full use of ozone, and its utilization rate generally does not exceed 30 %. [0005] Ozone catalytic ozonation technology is a method ...

AI Technical Summary

Problems solved by technology

It has been reported that ozone can oxidize carbon materials and lead to the deactivation of such catalysts. At the same time, the mechanism of carbon materials to generate hydroxyl radicals is the activation mechanism of Lewis base sites. Under alkaline conditions, calcium and magnesium ions in wastewater are easy to cause Catalyst deactivation; general metal oxide catalysts are often prepared by ultrafine powder one-time sintering process. Although the cost of the catalyst prepared by this method is low, the specific surface area is small, the content of active ingredients on the surface is low, and the catalytic effect is poor; traditional The metal oxide-supported catalyst is generally impregnated and sintered on the surface of porous alumina, which is not resistant to acid and alkali, and may easily cause the loss of active ingredients.

It has been reported that some noble metals and Pt-doped catalysts have good stability in water and high oxidation efficiency, but the cost of noble metals is relatively high, which is not suitable for large-scale wastewater treatment.

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