Preparation of Al2O3–SiO2 composite aerogels and their Cu2+ absorption properties
来源期刊：International Journal of Minerals Metallurgy and Materials2021年第2期
论文作者：Xiao-guang Liu Qiu-shuo Mao Yue Jiang Yan Li Jia-lin Sun Fei-xue Huang
文章页码：317 - 324
摘 要：In order to remediate heavy metal ions from waste water,Al2 O3-SiO2 composite aerogels are prepared via a sol-gel and an organic solvent sublimation drying method.Various characterisation techniques have been employed including X-ray diffraction（XRD）,Fourier transform infrared spectrometry（FTLR）,scanning electron microscope(SEIVD,Energy-dispersion X-ray spectroscopy（EDX）,Brunauer-Emmett-Teller（BET） N2 adsoprtion isotherm,and atomic absorption spectrometer（AAS）.XRD and FTIR suggest that the aerogels are composed of mainly Al2 O3 and minor SiO2.They have a high specific surface area（827.544 m2/g） and high porosity（86.0%） with a pore diameter of ～20 nm.Their microstructures show that the distribution of Al,Si,and O is homogeneous.The aerogels can remove ～99% Cu2+within ～40 min and then reach the equilibrium uptake（-69 mg/g）.Preliminary calculations show that the Cu2+uptake by the aerogels follows pseudo second-order kinetics where chemical sorption may take effect owing largely to the high surface area,high porosity,and abundant functional groups,such as Al-OH and Si-OH,in the aerogel network.The prepared aerogels may serve as efficient absorbents for Cu2+removal.
Xiao-guang Liu1，Qiu-shuo Mao1，Yue Jiang1，Yan Li1，Jia-lin Sun1，Fei-xue Huang2
1. School of Materials Science and Engineering, University of Science and Technology Beijing2. Fundamental Experimental Centre of Nature Science, University of Science and Technology Beijing
摘 要：In order to remediate heavy metal ions from waste water,Al2 O3-SiO2 composite aerogels are prepared via a sol-gel and an organic solvent sublimation drying method.Various characterisation techniques have been employed including X-ray diffraction（XRD）,Fourier transform infrared spectrometry（FTLR）,scanning electron microscope(SEIVD,Energy-dispersion X-ray spectroscopy（EDX）,Brunauer-Emmett-Teller（BET） N2 adsoprtion isotherm,and atomic absorption spectrometer（AAS）.XRD and FTIR suggest that the aerogels are composed of mainly Al2 O3 and minor SiO2.They have a high specific surface area（827.544 m2/g） and high porosity（86.0%） with a pore diameter of ～20 nm.Their microstructures show that the distribution of Al,Si,and O is homogeneous.The aerogels can remove ～99% Cu2+within ～40 min and then reach the equilibrium uptake（-69 mg/g）.Preliminary calculations show that the Cu2+uptake by the aerogels follows pseudo second-order kinetics where chemical sorption may take effect owing largely to the high surface area,high porosity,and abundant functional groups,such as Al-OH and Si-OH,in the aerogel network.The prepared aerogels may serve as efficient absorbents for Cu2+removal.
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