Research of photocatalytic performance of UiO-66-X/ZnIn2S4(X=H,NH2,(OH)2,Br)supported catalysts modified with different ligands
UiO-66-X/ZnIn2S4(X=H,NH2,(OH)2,Br)supported photocatalysts modified with different lig-ands were prepared by hydrothermal method,and the samples were characterized by Fourier infrared spectrom-eter,X-ray diffractometer,scanning electron microscope,UV-visible diffuse reflection spectrometer,photolu-minescence spectrometer and electrochemical work station.The effects of different ligand modification schemes on the photocatalytic performance of UiO-66-X/ZnIn2S4 were analyzed.Using Rhodamine B(RhB)and methyl orange(MO)solutions as target pollutants,the effects of electronic effects of different modification groups on the adsorption and photocatalytic properties of the composites were investigated.The results showed that the modified ZU-(OH)2/GF had the best adsorption efficiency for cationic dye RhB,and the adsorption efficiency was 46.8％at 30 min.On the other hand,the adsorption performance of all modified composites for anionic dye MO was lower than that of unmodified composites.Under simulated sunlight irradiation,the photocatalytic per-formance of all the composites modified by ligands was significantly improved,and the degradation rate of RhB by ZU-(OH)2/GF was as high as 99.0％after 150 min.After five consecutive cycles,the removal rate of RhB remained above 98％.This can be attributed to the fact that the ligand modification can effectively enhance the light absorption properties of the composites,and the electron donor groups can also increase the electron cloud density in theactive center of the composites,effectively promoting the separation and transfer of photogenerat-ed electron-holes.
ligand modificationsupported catalystphotocatalysiselectronic effectcomposite material
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