Preparation of adsorption-photocatalytic carbon materials by modified mangosteen shells and their properties
In this study,bimetallic biomass carbon composite AgZn/P/BC was prepared from mangosteen shells by the phosphoric acid activation,roasting and impregnation of zinc acetate and silver acetate solution.The adsorption and visi-ble light catalytic synergism of 2,4-dichlorophenol(2,4-DCP)of bimetallic biomass carbon composite were investigated under the visible light irradiation.The bimetallic biomass carbon composites were characterized by the scanning electron microscope(SEM),X-ray diffractometer(XRD),UV-visible diffuse reflection spectrometer(DRS),specific surface area tester(BET)and X-ray photoelectron spectroscopy(XPS).The characterization results showed that the bimetallic biomass carbon composite AgZn/P/BC had a large number of microporous structures,large specific surface area and strong light response ability.The concentration of reactants was determined by the high-performance liquid chromatogra-phy(HPLC)and the degradation rate was calculated.By comparing the single reaction conditions of different metal mo-lar ratios(Ag/Zn)and different metal acetate solution impregnation concentrations,it was found that when the metal molar ratio of Ag and Zn was 1:1 and the concentration of metal acetate solution was 0.01 mol/L,the bimetal compo-site material had the best degradation effect on 2,4-dichlorophenol,and the removal rate of 2,4-dichlorophenol could reach 62.33％after 30 min adsorption in the dark environment.The removal rate reached 93.52％in 120 min under light conditions.The kinetic study showed that the degradation rate of composite bimetallic biomass carbon material AgZn/P/BC with the concentration of metal acetate solution at 0.01 mol/L was nearly 1.76 times higher than that of AgZn/P/BC with the concentration of metal acetate solution at 0.03 mol/L.In addition,in pH test,the removal property of the bi-metallic biomass carbon composite was almost not affected by the environmental acidity and alkalinity,and had excellent environmental adaptability.In order to test the stability of the bimetallic biomass carbon composites,the cyclic experi-ment was carried out.The test results showed that the catalytic performance of the bimetallic biomass carbon composite was still good after four times of reuses,indicating that the bimetallic biomass carbon composite had the advantages of environmental protection and energy saving.This study also explored the mechanism of bimetallic biomass carbon com-posite adsorption-photocatalytic synergistic degradation of 2,4-dichlorophenol.In summary,bimetallic biomass carbon AgZn/P/BC has excellent photocatalytic degradation performance of 2,4-dichlorophenol.In addition,this study showed that under visible light irradiation,the composite bimetallic biomass carbon material AgZn/P/BC did have a synergistic degradation of 2,4-dichlorophenol by adsorption and visible light catalysis.The mechanism is that the phosphoric acid reacts with added silver acetate and zinc acetate to produce Ag3PO4 and Zn3(PO4)2.Thus,Ag3PO4/Zn3(PO4)2 is pro-duced,which co-catalyzes the degradation of the solution.
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