Research On The Design And Application Of Composite CuMn/SiO₂ Functional Materials

With the public environmental awareness’s enhancement,indoor pollution has become the main focus of our attention.Formaldehyde is regarded as one of main pollutants of indoor air,it has attracted people’s attention because it can dissolves very easily in water,has a very long period of incubation and can lead to serious ill-health.At the same time,the bacterial pollution of indoor air is also one of the prime culprit that damages human health.Based on this principle,a composite functional material named CuMn/SiO₂ was prepared by in situ growth method,which had a great effect on the detection of catalytic and antibacterial properties of formaldehyde.In this paper,the amorphous silica could as material carrier and was prepared by sol-gel method,and the MnO_x/SiO₂ catalyst was prepared by loading manganese oxide on the surface of the carrier.The effects of pH value of solution,the loading amounts of Mn,the roasting temperature of SiO₂ loaded with manganese,and the roasting time on the formaldehyde removal performance of supported MnO_x/SiO₂catalyst were investigated.The optimum technological conditions were determined:the solution pH was 8 in the reactive process,the loading amounts of Mn was 13wt%,the roasting temperature was 250℃after the Mn was loaded on the surface of SiO₂,and the roasting time was 2 h.In order to further analyze the samples,the catalysts were characterized by SEM-EDS,ICP,XRD,BET,XPS and H₂-TPR.The prepared supported MnO_x/SiO₂ catalyst had a large specific surface area（164.84 m²/g）and existed in amorphous form,and it had a good adsorption performance.The results showed that a larger specific surface area and higher Mn³⁺content were benefit to the catalytic oxidation of formaldehyde,and the amorphous structure was also helpful to the catalytic process.The mechanism of formaldehyde removal by supported MnO_x/SiO₂ catalyst was analyzed by in-situ infrared analysis,and its antibacterial performance was tested.The results showed that supported MnO_x/SiO₂catalyst had poor antibacterial performance,and copper was doped on this basis to improve the antibacterial performance of the catalyst.The composite functional materials of CuMn/SiO₂ was prepared by in situ growth method,and the pH value and the loading amounts of Cu in the process of the reaction on the properties of antibacterial functional bacaterials and catalysis were tested.The comprehensive antibacterial test and formaldehyde removal experiment results obtained the optimal preparation technology of composite functional materials of CuMn/SiO₂（The loading amounts of Mn was 13wt%,the loading amounts of Cu was 5wt%of Mn,the calcination temperature was 250℃after loading a two-component,the roasting time was 2 h）.With the addition of Cu,the specific surface area of the material increased（179.60 m²/g）,and the antibacterial effect reached 66.6%.