title: Advanced mesoporous organosilica material containing microporous beta-cyclodextrins for the removal of humic acid from water.
abstract: A new mesoporous organosilica material (beta-CD-Silica-4%) containing microporous beta-cyclodextrins (beta-CDs) has been prepared by the co-polymerization of a silylated beta-CD monomer with tetraethoxysilane in the presence of a structure-directing template, cetyltrimethylammonium bromide. Solid-state 13C and 29Si NMR studies provided evidence for the presence of covalently attached beta-CDs in the mesoporous material. Nitrogen adsorption experiments showed that beta-CD-Silica-4% material had a BET surface area of 460 m2/g and an average mesopore diameter of 2.52 nm. Small-angle powder X-ray diffraction pattern of beta-CD-Silica-4% material revealed the lack of highly ordered mesoporous structure. Adsorption experiments showed that beta-CD-Silica-4% material removed up to 99% of humic acid from an aqueous solution containing 50 ppm of humic acid at a solution-to-solid ratio of 100 ml/g.
authors.affiliation: Department of Materials Science and Engineering, University of Illinois, Urbana-Champaign, 1304 W Green Street, Urbana, IL 61801, USA. chunqing@uiuc.edu
authors.forename: Chunqing
authors.initials: C
authors.lastname: Liu
authors.forename: Nathaniel
authors.initials: N
authors.lastname: Naismith
authors.forename: James
authors.initials: J
authors.lastname: Economy
mesh_terms: D000327:Adsorption; D006812:Humic Substances / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D012822:Silicon Dioxide / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D047392:beta-Cyclodextrins; D014867:Water; D012822:Silicon Dioxide