Extraordinary Adsorption Properties of Nano Porous Hydrophobic Silica Aerogels
The adsorption properties of hydrophobic silica aerogels were studied.Polyethoxy-disiloxanes (E-40),ethanol (EtOH),hydrogen fluoride (HF) were used as silican precursor,solvent and catalyst,respectively,followed by solvent substitution and surface modification to prepare silica aerogels.Scanning electronic microscopy,nitrogen adsorption analyzer,contact angle measurement and Fourier transform infrared spectroscopy were used to characterize the structure and properties of silica aerogels.The conclusion is that the silica aerogels are with good hydrophobicity and the gas adsorption capacities is excellent for toxic gases such as benzene and carbon tetrachloride,which is 2~3 times higher than that of activated carbon fiber (ACF) or granule of activated carbon (GAC).Moreover,the adsorption capacity for organic solvent is 20-30 times of its own weight,which is much larger than that of GAC or Poly vinyl alcohol (PVA).In addition,the adsorption capacity of silica aerogels remains almost the same value after two times of adsorption-desorption processes,which means that the process is recyclable,low-cost and environmental friendly.
Silica aerogels Hydrophobic Adsorption material Ambient pressure drying
Wei Xiaoqing Ni Xingyuan Zhang Zhihua Shen Jun Ai Du Zu Guoqing
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Pohl Institute of Solid State Physics,Tongji University,Shanghai 200092,PR China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
45-48
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）