title: Organosilica copolymers for the adsorption and separation of multiple pollutants.
abstract: Benzene, diethylbenzene, and ethylenediamine-bridged bistrialkoxy precursors were used in the synthesis of multifunctional PMO copolymers for the adsorption of phenols and metal ions. Polyoxyethylene(10) stearyl ether (Brij 76) was used as the structure director with the surfactant template approach in the synthesis. The resulting PMO copolymers with two or more bridging groups have been characterized by nitrogen gas adsorption, powder X-ray diffraction, and 13C and 29Si solid-state NMR. These organosilicas exhibit large surface areas, narrow pore size distributions, large total pore volumes, and pore ordering consistent with well ordered, hexagonally packed p6mm structures. Minimal competitive effects were observed on the adsorption of p-chlorophenol to the copolymers in the presence of copper ions in solution. Similarly, the presence of p-chlorophenol in solution or adsorbed onto the copolymers did not interfere with copper adsorption. Replacement of a small portion of the benzene bridge in the 90:10 BENZ:EDA copolymer with diethylbenzene produced a copolymer 2.5-fold more efficient for p-chlorophenol adsorption. ICP analysis revealed that greater than 98% of adsorbed copper was removed during extraction with HCl, and this extraction process can be repeated with no difference in copper adsorption after regeneration.
authors.affiliation: Laboratory for Molecular Interfacial Interactions, Code 6920, Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375, USA.
authors.forename: Shalini
authors.initials: S
authors.lastname: Jayasundera
authors.forename: Mark C
authors.initials: MC
authors.lastname: Burleigh
authors.forename: Mazyar
authors.initials: M
authors.lastname: Zeinali
authors.forename: Mark S
authors.initials: MS
authors.lastname: Spector
authors.forename: Joel B
authors.initials: JB
authors.lastname: Miller
authors.forename: Wenfu
authors.initials: W
authors.lastname: Yan
authors.forename: Sheng
authors.initials: S
authors.lastname: Dai
authors.forename: Michael A
authors.initials: MA
authors.lastname: Markowitz
mesh_terms: D000327:Adsorption; D001554:Benzene / Q000737:chemistry / Q000302:isolation & purification; D002614:Chelating Agents / Q000138:chemical synthesis* / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry / Q000302:isolation & purification; D018360:Crystallography, X-Ray; D004785:Environmental Pollutants / Q000737:chemistry* / Q000302:isolation & purification; D005029:Ethylenediamines / Q000737:chemistry / Q000302:isolation & purification; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D017646:Organosilicon Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D016062:Porosity
chemical_list: D002614:Chelating Agents; D002733:Chlorophenols; D004785:Environmental Pollutants; D005029:Ethylenediamines; D007202:Indicators and Reagents; D017646:Organosilicon Compounds; D001554:Benzene