The catalytic reduction of p-nitrophenol,a common pollutant in industrial wastewater,to p-aminophenol with higher added value is of great significance for the development of green chemistry and chemical industry.Although noble metal catalysts(Au,Pd,etc.)show excellent catalytic performance for this reaction,high cost limits their industrial application.In contrast,Ni-based catalysts have attracted wide attention due to their advantages of low cost and high activity but traditional synthesis methods usually have disadvantages such as large size of Ni nanoparticles and easy agglomeration.Firstly,the SiO2-MHMs support was synthesized by aerosol technology combined with surfactant cetyltrimethyl ammonium bromide(CTAB)using solvent evaporation self-assembly strategy.And then using nickel nitrate as Ni source,a series of Ni/SiO2-MHMs catalysts with different Ni loadings(mass fraction)were obtained by using impregnation and NaBH4 reduction strategy.The analysis results of X-ray diffraction(XRD),scanning electron microscope(SEM),fourier transform spectroscopy(FT-IR)and N2 physical adsorption/desorption and other characterization methods show that the SiO2-MHMs support has abundant ordered mesopore structure with concave hollow microsphere morphology,and Brunanuer-Emmett-Teller(BET)specific surface area and total pore volume are 1421 m2/g and 0.92 cm3/g,respectively.In the 5-Ni/SiO2-MHMs catalyst obtained by impregnation-reduction of the support,Ni nanoparticles are highly dispersed on the surface of the support and in the mesoporous channels,resulting in a decrease in the BET specific surface area(854 m2/g)and total pore volume(0.47 cm3/g).The obtained catalyst was applied to the reduction reaction of p-nitrophenol.The results show that the catalyst with 5%Ni loading shows the best catalytic performance(complete conversion within 4 min),and the catalytic performance does not decrease significantly after 4 cycles,which is better than other reported Ni-based supported catalysts.
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