Development And Experimental Study Of LED Photocatalytic Reactor

With the development of semiconductor technology,LED applications are becoming more and more widespread.Not only has it been widely used in the field of lighting,but also has considerable advantages in the field of non-illumination.The main purpose of this paper is to study and design the light source structure of photocatalytic reactor using LED,and the degradation effect of organic pollutants in water under different light sources.First of all,SolidWorks and LightTools are used to design the double-sided light-emmitting model and optimize the simulation.the UV 2835LEDs with wavelength of 365nm are used as the light source.Acrylic plate is used as basic material and uniformly doped with SiO₂ and Al₂O₃ crystal particles as nano light guide plate.The simulation results show that the light guide plate is600mm*300mm*4mm,the particle number density of Al₂O₃ is 3450mm^-3and the particle size is 2150nm,the UV coupling efficiency are above 70%and the illumination uniformity of double-sided emission is above 80%.It provides a certain reference value for the selection of nano light guide plates with special wavelengths.Secondly,the appropriate nano-light guide plate is selected to make the ultraviolet double-sided light source and waterproofed.The light source is combined with a suitable drive circuit and a reaction vessel to construct an ultraviolet photocatalytic reactor.The ultraviolet light source in the reactor is immersed in the contaminated liquid and arranged in parallel at equal intervals.The catalyst is supported on the foamed nickel and placed between the two ultraviolet light sources.The immersion positive photocatalytic structure is used to degrade a certain concentration of methyl orange solution.The experimental results show that the immersion positive photocatalytic structure is used under the ultraviolet light source of 365nm,and the degradation rate of methyl orange concentration is 23.21%.At lower concentrations,the methyl orange solution has a strong absorption of 365nm ultraviolet light,which can be improved using a backlight catalytic structure.Finally,the absorption spectra of visible photocatalyst HSNO-CdS is measured and used as the target to construct the LED spectra.By calculating the combination proportion of all kinds of monochrome LED and enlarging according to the actual application.The arrangement of those monochrome LED can be as uniform as possible in the production process.After waterproof treatment,the light source is placed parallel to the contaminated liquid.The catalyst in the reactor is suspended.The experimental results show that the degradation rate of 2760ml methyl orange solution prepared by spectral structure technology light source in 140min is 43.55%.Under the same conditions,the degradation rate of methyl orange by ordinary white light source is only 23.11%.