文献类型：期刊文献

英文题名：Preparation of hydrophobic granular silica aerogels and adsorption of phenol from water

作者：Qin, Guotong[1];Yao, Yuan[1];Wei, Wei[2];Zhang, Tao[3]

第一作者：Qin, Guotong

通讯作者：Qin, GT[1]

机构：[1]Beihang Univ, Sch Chem & Environm, Minist Educ, Key Lab Bioinspired Smart Interfacial Sci & Techn, Beijing 100083, Peoples R China;[2]Beijing Union Univ, Coll Arts & Sci, Dept Food Sci, Beijing 100083, Peoples R China;[3]Beihang Univ, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

第一机构：Beihang Univ, Sch Chem & Environm, Minist Educ, Key Lab Bioinspired Smart Interfacial Sci & Techn, Beijing 100083, Peoples R China

通讯机构：[1]corresponding author), Beihang Univ, Sch Chem & Environm, Minist Educ, Key Lab Bioinspired Smart Interfacial Sci & Techn, 37 Xueyuan Rd, Beijing 100083, Peoples R China.

年份：2013

卷号：280

起止页码：806-811

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20132816480467);Scopus(收录号：2-s2.0-84879686002);WOS:【SCI-EXPANDED(收录号:WOS:000321045700120)】；

基金：Project 51172027 supported by NSFC. Project supported by Beijing Municipal Commission of Education (KM200811417013).

语种：英文

外文关键词：Hydrophobic granular silica aerogel; Sol-gel synthesis; Ambient pressure drying; Adsorption; Phenol

摘要：Granular silica aerogels with different degrees of hydrophobicity were prepared via sol-gel synthesis followed by drying at ambient pressure. The effects of preparation conditions, including pH and modification time, on aerogel characterization were investigated. The aerogels were characterized using nitrogen adsorption at 77 K. We found that the aerogel was a nano- structured material with high specific surface area and high porosity. The aerogels were used for phenol adsorption from water. The effects of hydrophobicity degree, phenol concentration, and contact time were studied. Batch kinetic and isotherm studies were carried out to evaluate the effects of contact time and phenol concentration. The Freundlich model and the pseudo-second-order fitted the experimental data. The results also indicated that the phenol adsorption process involved both boundary layer diffusion and intraparticle diffusion. When the equilibrium concentration of phenol was 290 mg L-1, the adsorption of phenol on the aerogel was 142 mg g(-1). (C) 2013 Elsevier B.V. All rights reserved.