Microwave Assisted OMS-2 Synthesis And Photocatalytic Degradation Of Phenol

The diversity and unique physicochemical properties of manganese oxides are a kind of environmental chemical materials with high reactivity in soils and sediments.OMS-2 is one of the representative ones,with a high specific surface area and a special pore structure,which makes it have good adsorption,oxidation,and catalytic properties,and thus has received extensive attention.The microwave irradiation provides selectivity.These polar molecules in the electromagnetic field move violently under the action of an electric field,transform kinetic energy into heat energy,and quickly and uniformly heat the sample.In recent years,they are increasingly used in the field of material synthesis.In this paper,the effects of reaction time,temperature,inorganic acid type and cation doping on the synthesis of OMS-2 and its photochemical activity under microwave heating system were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS)and thermogravimetric analysis(TGA)techniques were used to characterize the crystal structure,and the characteristics of OMS-2 photocatalytic degradation of phenol were discussed.The research content and results of this paper are as follows:1.The synthesis of OMS-2 is significantly affected by temperature and time.OMS-2 was synthesized at 160°C and 180°C within 1 h of synthesis time.The synthesis of acidic mink and manganese under other conditions of temperature and time was considered.The microwave-assisted synthesis of OMS-2 has good photocatalytic activity,and the highest TOC and phenol removal rates were 59.8% and 73.8%,respectively.2.In the experimental study of photocatalytic activity conditions,the pH value is the experimental parameter that has the greatest impact on the results,especially between 2.00-3.00,the TOC removal rate is reduced from 91.0% to 42.1%,and the phenol removal rate is decreased from 99.7% to 52.1%.Temperature,phenol concentration and OMS-2 concentration also have a certain degree of influence on the photocatalytic performance.3.The change of the type of inorganic acid in the synthesis system has a certain influence on the product.The single-phase OMS-2 is synthesized in the sulfuric acid and nitric acid systems,but hydrochloric acid is involved in the synthesis of the product with the formation of other impurities.In the study of photocatalytic phenol,the effect of O180-10-N is better.4.Cation doping and concentration changes have a significant effect on the synthesis of OMS-2.The synthesized material contains impurities,and OMS-2 has not been synthesized in part of the doping system.In the study of photocatalytic activity,the performance of each material is also different.As the doping concentration of Ag increases,the removal rate of phenol and TOC does not change significantly.The doping concentration of Co increases,and the removal rate increases first and then decreases.As the doping concentration of Ce increased,the removal rate showed an upward trend.