Study On The Application Of Ozone Microbubbles In Porous Alumina And Its Application To Pesticide Degradation

Pesticide residue is one of the main problems of environmental pollution.It is of great significance to study the degradation of pesticides.The use of advanced oxidation technology to degrade pesticides is mainly based on the high oxidation activity of ozone and its combination with water to produce hydroxyl radicals,which decomposes pesticide molecules into non-toxic products.In this experiment,a series of porous alumina ceramics were used as aeration heads,micro bubbles were produced by ceramic channels,and ozone gas was used to aerate,and the process of aeration and ozone degradation of pesticides was studied.The research contents and conclusions are mainly included in the following aspects:1.a series of porous alumina ceramics with different pore size and strength were prepared by using silica alumina with different particle size as aggregate,silica sol and sodium silicate solution as adhesive.Ceramic pore size is linearly related to particle size,and strength is mainly related to sintering temperature.Porous alumina ceramics have high compressive strength and good chemical stability.2.the porous alumina ceramic was used as the aeration head,the aeration process was characterized,and the effects of different factors on the bubble were studied.Pore size and surface wettability are the main factors determining the size of bubbles.The size of bubbles produced by porous alumina ceramics with a pore size of 20 m is the smallest,and the smaller the contact angle is,the smaller the bubble size is.The saturation rate of ozone in water is mainly related to the gas flow.The saturation concentration is determined by the size of the bubble.The smaller the bubble is,the higher the saturation concentration is.3.the ozone aerator is applied to pesticide degradation.Microbubbles can greatly increase the degradation rate and degradation rate of pesticides.Environmental factors have a significant effect on the degradation process.Alkaline conditions and raising temperature are beneficial to improve pesticide degradation.The smaller the size of the microbubbles,the higher the degradation rate of pesticides,the gas flow can increase the degradation rate.