CN-117920172-B - Preparation method and application of ozone catalyst

Abstract

The application relates to the technical field of organic wastewater treatment, in particular to a preparation method and application of an ozone catalyst, wherein the preparation method and application of the ozone catalyst comprise the following steps of (1) ball milling, (2) melting and (3) sectional cooling; the catalyst can promote the reaction of ozone molecules and organic matters which are difficult to react, effectively reduce COD which is difficult to degrade in water, improve the COD removal rate, improve the ozone utilization rate and achieve the aim of improving the sewage treatment efficiency.

Inventors

• LIU SHANGYUE
• LI SHULIN
• LIANG JUNYU
• FANG SHENGNAN
• MO FAN
• LONG SHUNHONG
• TANG KAI
• LI WEI
• YU YUFU
• LI TING
• LIANG KANG
• DU SONGYAN

Assignees

• 广西柳钢环保股份有限公司

Dates

Publication Date

20260508

Application Date

20231227

Claims (5)

1. 1. A method for preparing an ozone catalyst, comprising the steps of: (1) Ball milling, namely mixing ceramsite, waste glass slag, steel slag and alumina powder according to the mass ratio of 6-12:5-9:3-5:1-2, and performing ball milling to obtain a mixture; (2) Melting, namely melting the mixture at high temperature to obtain a melt, adding coconut shell powder into the melt, cooling to 600-800 ℃, adding titanium dioxide, and stirring for reaction for 30-50min to obtain a molten mixture; (3) Cooling the molten mixture obtained in the step (2) in a sectional manner to obtain the ozone catalyst; The coconut shell powder in the step (2) is subjected to hydrothermal reaction for 55-70min at 120-140 ℃, cooled to room temperature, dried at 100-110 ℃, heated to 500-700 ℃ under the protection of gas in a vacuum furnace, reacted for 30-50min, cooled to room temperature, washed with deionized water, dried, ground to pass through a 80-100 mesh sieve, and the sectional cooling in the step (3) is that the temperature is firstly reduced to 300-400 ℃ according to the cooling speed of 25-35 ℃ per min, then reduced to 80-150 ℃ according to the cooling speed of 10-15 ℃ per min, and finally reduced to 25-30 ℃ according to the cooling speed of 15-20 ℃ per min.
2. 2. The method of claim 1, wherein the mass ratio of the melt, the coconut shell meal and the titanium dioxide in step (2) is 10-15:2-4:1-2.
3. 3. The method according to claim 1, wherein the melting in the step (2) is heated to 1000-1200 ℃ at a temperature rising rate of 10-15 ℃ per minute.
4. 4. The method according to claim 1, wherein the vacuum furnace is a vacuum tube furnace and the gas for protection is nitrogen.
5. 5. The use of an ozone catalyst prepared by the method according to any one of claims 1 to 4, wherein the ozone catalyst is used in sewage treatment, in particular for catalyzing the oxidation reaction of ozone.

Description

Preparation method and application of ozone catalyst [ Field of technology ] The invention relates to the technical field of organic wastewater treatment, in particular to a preparation method and application of an ozone catalyst. [ Background Art ] With the gradual perfection of environmental protection policies and technologies, the requirements on the discharge indexes of the wastewater are more strict, and the treatment technologies of organic wastewater such as coal chemical wastewater, cultivation wastewater, printing and dyeing wastewater, medical wastewater, landfill leachate and the like are greatly improved. Ozone is used as an excellent strong oxidant, and has extremely strong electron-obtaining (oxidizing) capability on hydroxyl radicals formed in the oxidation treatment process of organic matters, and the oxidation potential is 2.8eV, which is inferior to the oxydation of fluorine, so that the oxidative decomposition mineralization of the organic matters achieves the effect of harmless treatment. Ozone is used as a common oxidant for advanced oxidation, and the organic wastewater treatment cost is high due to low utilization rate, so that the popularization and application of the ozone are limited to a certain extent. In order to improve the utilization efficiency of ozone, research and application of heterogeneous ozone catalysts have been rapidly developed in recent years, and catalyst carriers include activated alumina balls, ceramsite, activated carbon and the like. The ozone catalyst with the activated alumina ball carrier has higher production and application cost and smaller application range, the ozone catalyst with the ceramsite carrier has relatively poorer mechanical strength and longer service life, and the ozone catalyst with the activated carbon carrier has larger specific surface area, but has the risks of combustion and explosion in the use process of high-concentration ozone. Therefore, obtaining an efficient and low-cost ozone catalyst is a problem to be solved in the present application. [ Invention ] In view of the foregoing, it is desirable to provide a method for preparing an ozone catalyst that is simple to operate and low in cost, and the obtained ozone catalyst can be effectively used in wastewater treatment, and applications thereof. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a method for preparing an ozone catalyst, the method comprising the steps of: (1) Ball milling, namely mixing ceramsite, waste glass slag, steel slag and alumina powder according to the mass ratio of 6-12:5-9:3-5:1-2, and performing ball milling to obtain a mixture; (2) Melting, namely melting the mixture at high temperature to obtain a melt, adding coconut shell powder into the melt, cooling to 600-800 ℃, adding titanium dioxide, and stirring for reaction for 30-50min to obtain a molten mixture; (3) And (3) cooling the molten mixture obtained in the step (2) in a sectional manner to obtain the ozone catalyst. Further, in the step (2), the mass ratio of the melt, the coconut husk powder and the titanium dioxide is 10-15:2-4:1-2. Further, the melting in the step (2) is heated to 1000-1200 ℃ according to the temperature rising speed of 10-15 ℃ per min. And (2) carrying out hydrothermal reaction for 55-70min at 120-140 ℃, cooling to room temperature, drying at 100-110 ℃, heating the dried material to 500-700 ℃ in a vacuum furnace under the protection of gas, reacting for 30-50min, cooling to room temperature, washing with deionized water, drying, and grinding to 80-100 mesh sieve. Further, the vacuum furnace is a vacuum tube furnace, and the gas for protection is nitrogen. Further, the sectional cooling in the step (3) is that the temperature is firstly reduced to 300-400 ℃ according to the cooling speed of 25-35 ℃ per minute, then reduced to 80-150 ℃ according to the cooling speed of 10-15 ℃ per minute, and finally reduced to 25-30 ℃ according to the cooling speed of 15-20 ℃ per minute. The ozone catalyst is applied to sewage treatment, and is particularly used for catalyzing the oxidation reaction of ozone in the sewage treatment process by adopting ozone. The invention has at least the following beneficial effects: 1. Aiming at the problems that ozone molecules and organic matters react selectively, the reaction is incomplete and the utilization rate is low, so that all organic pollutants in wastewater can not be thoroughly degraded, the application provides the efficient ozone catalyst, which takes ceramsite as a main carrier and carries out a series of treatments, the catalyst can promote the reaction of ozone molecules and organic matters which are difficult to react, effectively reduce COD which is difficult to degrade in water, improve COD removal rate, improve ozone utilization rate and achieve the aim of improving sewage treatment efficiency. 2. According to the preparation method, after the carrier raw material is subjected to meltin