title: Adsorption and desorption performance of benzene over hierarchically structured carbon-silica aerogel composites.
abstract: Hierarchically structured carbon-silica aerogel (CSA) composites were synthesized from cheap water glass precursors and granulated activated carbon via a post-synthesis surface modification with trimethylchlorosilane (TMCS) and a low-cost ambient pressure drying procedure. The resultant CSA composites possess micro/mesoporous structure and hydrophobic surface. The adsorption and desorption performance of benzene on carbon-silica aerogel composite (CSA-2) under static and dynamic conditions were investigated, comparing with pure silica aerogel (CSA-0) and microporous activated carbon (AC). It was found that CSA-2 has high affinity towards aromatic molecules and fast adsorption kinetics. Excellent performance of dynamic adsorption and desorption observed on CSA-2 is related to its higher adsorption capacity than CSA-0 and less mass transfer resistance than AC, arising from the well-developed microporosity and open foam mesostructure in the CSA composites.
authors.affiliation: Department of Environmental Nano-Materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
authors.forename: Baojuan
authors.initials: B
authors.lastname: Dou
authors.forename: Jinjun
authors.initials: J
authors.lastname: Li
authors.forename: Yufei
authors.initials: Y
authors.lastname: Wang
authors.forename: Hailin
authors.initials: H
authors.lastname: Wang
authors.forename: Chunyan
authors.initials: C
authors.lastname: Ma
authors.forename: Zhengping
authors.initials: Z
authors.lastname: Hao
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000302:isolation & purification*; D001554:Benzene / Q000302:isolation & purification*; D002606:Charcoal / Q000737:chemistry*; D007700:Kinetics; D016062:Porosity; D059027:Recycling; D058428:Silica Gel / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013329:Structure-Activity Relationship; D013499:Surface Properties
chemical_list: D000393:Air Pollutants; D002606:Charcoal; D058428:Silica Gel; D001554:Benzene