Preparation And Characterization Of Silver Phosphate Based Composite Photocatalysts

With the rapid development of global industrialization, environmentalpollution and energy crisis have become two major problems to be solved inhuman development, the development of new clean energy and environmentalprotection is imminent. Nano titanium dioxide (TiO2) is a typical representativeof semiconducting photocatalytic materials for its cheap price, highphotocatalytic ability, good stability and other characteristics with toxicpollution, and by widespread concern. However, due to the larger band gap ofTiO2, the spectral response range is narrow, can only absorb less UVwavelength387.5nm (only4%of solar energy), and can not make full use ofsolar energy accounted for43%of visible light, and nano-TiO2semiconductorthe photo-generated electron-hole pair recombination rate is high, resulting inlow photocatalytic efficiency, low quantum efficiency is the main reason forlimiting the application of its large-scale industrialization. In addition, thecurrent state of the application form semiconductor photocatalytic materials aremainly powder, if applied to continuous industrial production, the presence ofcatalyst recycling difficult, high prices and unfavorable factors easily gather inactivation severely limits its industrial value. Recently reported Ag3PO4novel photocatalysts, Ag3PO4can absorb sunlight wavelengths less than520nm, and the quantum yield of up to90%visible light, visible light hasgreat potential in catalysis, but there are difficult recovery, stability is nothigh, Easy deactivation and other shortcomings. For the current studysupported the semiconductor photocatalyst more cause for concern, it utilizesmicroporous molecular sieve adsorption capacity is higher than the carrier andphotocatalytic activity of the semiconductor surface area, can effectively solvethese problems. Therefore, the study of the development of new, highlyefficient and stable, with a visible response of semiconducting photocatalyticmaterials has very important significance and value.This paper studies the Ag3PO4the preparation and synthesis of newphotocatalysts， and Ag3PO4/AlPO4-5preparation, Ag3PO4/AlPO4-5semiconductor composite photocatalytic materials, mainly to get the followingresults:Silver nitrate solution and a solution of disodium hydrogen phosphate asraw material, respectively, using two precipitation and hydrothermal methodAg3PO4type photocatalyst was prepared. In visible light to degrade organicdye Rhodamine B experiment, Ag3PO4photocatalyst prepared by two methodscan be dropped in the visible light organic solution of Rhodamine B dyesolution, which uses the degradation rate Ag3PO4prepared by precipitationmethod using water above the photocatalyst Ag3PO4photocatalyst prepared by thermal method.Successfully prepared AlPO4-5zeolite by hydrothermal method toAlPO4-5zeolites were successfully prepared Ag3PO4/AlPO4-5compositephotocatalytic materials using precipitation method. Methylene blue andrhodamine B as the target degradation studied photocatalytic semiconductorAg3PO4photocatalytic activity Ag3PO4/AlPO4-5semiconductor compositephotocatalytic materials prepared under visible light under different loadconditions, the results show that certain as the range increases the amount ofthe photocatalyst Ag3PO4, increasing the photocatalytic activity of thecomposite active material; when the semiconductor photocatalyst Ag3PO4amount reaches a certain amount, the maximum activity; continue to increasethe photocatalytic activity of the photocatalyst Ag3PO4but reduced. When thesemiconductor photocatalyst mass percentage Ag3PO4is60%, thephotocatalytic activity Ag3PO4/AlPO4-5composite material is pure Ag3PO4photocatalytic activity three times.Successfully prepared Ag3PO4/SAPO-34composite photocatalyticmaterials using precipitation method. Methylene blue and rhodamine B as thetarget degradation studied Ag3PO4/SAPO-34composite photocatalyticmaterials Ag3PO4photocatalyst under different loading conditions in thepreparation of photocatalytic activity under visible light, the results show thatin a certain range with Ag3PO4amount of the photocatalyst is increased,increasing the photocatalytic activity of the active composite material; when the semiconductor photocatalyst Ag3PO4amount reaches a certain amount, themaximum activity; continues to increase but decrease in the photocatalyticactivity of the photocatalyst Ag3PO4. When the mass percentage Ag3PO4semiconductor photocatalyst is60%, the photocatalytic activity of thecomposite materialAg3PO4/SAPO-34is highest.