Preparation of Al2O3–SiO2 composite aerogels and their Cu2+absorption properties

作     者：Xiao-guang Liu Qiu-shuo Mao Yue Jiang Yan Li Jia-lin Sun Fei-xue Huang Xiao-guang Liu;Qiu-shuo Mao;Yue Jiang;Yan Li;Jia-lin Sun;Fei-xue Huang

作者机构：School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Fundamental Experimental Centre of Nature ScienceUniversity of Science and Technology BeijingBeijing 100083China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2021年第28卷第2期

页      面：317-324页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081702[工学-化学工艺] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 081701[工学-化学工程] 

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.51602018) the Beijing Municipal Natural Science Foundation(No.2154052) the China Postdoctoral Science Foundation(No.2014M560044) the Fundamental Research Funds for the Central Universities,China(No.FRF-GF-17-B7) 

主　　题：heavy metal ion aerogel absorption organic solvent sublimation drying specific surface area porosity 

摘      要：In order to remediate heavy metal ions from waste water,Al2O3–SiO2 composite aerogels are prepared via a sol–gel and an organic solvent sublimation drying *** characterisation techniques have been employed including X-ray diffraction(XRD),Fourier transform infrared spectrometry(FTIR),scanning electron microscope(SEM),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 Al2O3 and minor *** have a high specific surface area(827.544 m^2/g)and high porosity(86.0%)with a pore diameter of~20 *** microstructures show that the distribution of Al,Si,and O is *** aerogels can remove~99%Cu^2+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 *** prepared aerogels may serve as efficient absorbents for Cu^2+removal.