| With the rapid development of modern industry and the energy industry,the problem of environmental pollution has become more and more serious and it has broken through the sustainable development of society.Photocatalytic technology has the advantages of mild reaction conditions,strong oxidizing ability,and environmental protection.Therefore,it has attracted widespread attention from researchers.As a d10 electronic structure semiconductor material,in theory,GaOOH semiconductor has strong photocatalytic oxidation ability,but there is little research on it in the field of photocatalysis.In this study,GaOOH was used as the main material,and it was doped and compound modified.Thus,Ba-doped GaOOH photocatalyst,ZnBiNbO5/GaOOH composite photocatalyst and Ag3PO4/GaOOH composite photocatalyst were prepared The prepared samples were analyzed for morphology,structure,and chemical state,and their optical properties were tested.This provides a new perspective for the application of wide band gap semiconductor GaOOH in the field of photocatalytic technology and broadens the potential application range of GaOOHThe main research contents and conclusions of this paper are as follows(1)This paper studied the effects of Ba doping on the morphology,band gap structure,and photocatalytic performance of GaOOH.3mol%,6mol%and 12mol%Ba-doped GaOOH photocatalysts were successfully prepared by a solvothermal method and characterization analysis were performed.SEM characterization results showed that the doping of Ba significantly changed the morphology of GaOOH.After Ba doping,the morphology of the GaOOH material changed from the original rough stick shape to the wheat ear shape at both ends,which greatly increased the specific surface area of GaOOH.According to BET results,the specific surface area of 3mol%Ba doped GaOOH was the largest(21.5854 m’/g),which was 3.42 times that of pure GaOOH(6.3047 m2/g).The UV-Vis DRS results showed that compared with pure GaOOH,the UV-vis absorption spectra of 3mol%,6mol%and 12mol%Ba-doped GaOOH samples were redshifted.At the same time,the PL results showed that the doping of Ba formed defects on the surface of GaOOH,which greatly reduced the recombination of photogenerated electron-hole pairs,thereby improving the photocatalytic activity of GaOOH.The results of photocatalytic degradation of enrofloxacin showed that after ultraviolet light irradiation for 60 min,the removal rate of enrofloxacin by 3mol%,6mol%and 12mol%Ba-doped GaOOH samples was 20%higher than that of pure GaOOH Among them,the 3mol%Ba-doped GaOOH sample was the best.Scavenger experiments and EPR results showed that during the photocatalytic degradation of enrofloxacin in the 3mol%Ba-doped GaOOH sample,the contribution of each active radical was:h+<OH<·O2-.(2)In this paper,8mol%,16mol%and 32mol%ZnBiNbO5/GaOOH composite photocatalysts were prepared and characterization analysis were performed.SEM results showed that the ZnBiNbO5 was not destroyed by high temperature and pressure during the solvothermal process,and GaOOH was successfully dispersed on the surface of ZnBiNbO5.UV-Vis DRS results showed that compared with pure ZnBiNbO5 and pure GaOOH,the UV-vis absorption spectrum of the 8mol%,16mol%and 32mol%ZnBiNbO5/GaOOH composite photocatalysts exhibited significant redshift.The results of photocatalytic degradation of enrofloxacin showed that the optimal composite amount of ZnBiNbO5 and GaOOH was 8mol%.The removal rate of enrofloxacin by 8mol%ZnBiNbO5/GaOOH was 15.11%higher than that of pure ZnBiNbO5 and 29.29%higher than that of pure GaOOH after ultraviolet light irradiation for 60 min.Finally,scavenger experiments and EPR results showed that during the degradation of enrofloxacin by 8mol%ZnBiNbO5/GaOOH composite,the contribution of each active radical was:·O2->·OH>h+.(3)This paper studied the preparation,characterization and photocatalytic performance of Ag3PO4/GaOOH composite photocatalyst.UV-Vis DRS results showed that,compared with pure GaOOH,the UV-vis absorption spectra of 5mol%,10mol%and 15mol%Ag3PO4/GaOOH showed significant redshift.The experimental results of photocatalytic degradation of rhodamine B showed that 15mol%Ag3PO4/GaOOH exhibited excellent performance under visible light irradiation.Compared with pure GaOOH,the decolorization rate of rhodamine B by 15mol%Ag3PO4/GaOOH was increased by 97.83%after visible light irradiation for 60 min.In addition,the effects of some cations and anions present in actual wastewater on the photocatalytic degradation of rhodamine B by 15mol%Ag3PO4/GaOOH were studied in this paper.The results showed that the addition of Fe3+,K+,Na+,NO3-,HCO3-,CO32-,Cl-or SO42-had a small effect on the decolorization rate of rhodamine B,indicating that the prepared 15mol%Ag3PO4/GaOOH had good potential to actual wastewater.Further cyclic degradation experiment results showed that compared with pure Ag3PO4,15mol%Ag3PO4/GaOOH had better stability.At the same time,in the process of photocatalytic degradation of rhodamine B by 15mol%Ag3PO4/GaOOH,the contribution of each active radical was h+>·O2->·OH. |
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