Study of the use of emulsion interfacial method to prepare ZnCl2/NH2-MIL-125(Ti)composites for enhanced photocatalytic Cr(Ⅵ) reduction
Emulsion interfacial method for preparing photocatalytic composites has remarka-ble advantages in enhancing photocatalytic activity.The ZnCl2/NH2-MIL-125(Ti)compos-ites were synthesized by emulsion interface method,which were characterized by X-ray pow-der diffraction,fourier transform infrared spectroscopy,scanning electron microscope,X-ray photoelectron spectroscopy,specific surface area and pore analysis and ultraviolet-visible diffuse reflection spectrum.The photocatalytic reduction of Cr(Ⅵ) by the composites was investigated,and the photocatalytic reaction mechanism and the reuse of the catalyst were discussed.The results show that the emulsion interfacial method will significantly affect the photoelectric properties of ZnCl2/NH2-MIL-125(Ti).When the doping mass ratio of ZnCl2 to NH2-MIL-125(Ti)is 1∶6,the mass concentration of catalyst is 0.4 g/L,pH=2 and methanol is added to 0.5 mL,the efficiency of UV catalytic reduction of Cr(Ⅵ) of the com-posites is up to 95%,and the reduction efficiency is 75%after recycling for 5 times.
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