title: Magnetic mesoporous materials for removal of environmental wastes.
abstract: We have synthesized two different magnetic mesoporous materials that can be easily separated from aqueous solutions by applying a magnetic field. Synthesized magnetic mesoporous materials, Mag-SBA-15 (magnetic ordered mesoporous silica) and Mag-OMC (magnetic ordered mesoporous carbon), have a high loading capacity of contaminants due to high surface area of the supports and high magnetic activity due to the embedded iron oxide particles. Application of surface-modified Mag-SBA-15 was investigated for the collection of mercury from water. The mercury adsorption using Mag-SBA-15 was rapid during the initial contact time and reached a steady-state condition, with an uptake of approximately 97% after 7h. Application of Mag-OMC for collection of organics from water, using fluorescein as an easily trackable model analyte, was explored. The fluorescein was absorbed into Mag-OMC within minutes and the fluorescent intensity of solution was completely disappeared after an hour. In another application, Mag-SBA-15 was used as a host of tyrosinase, and employed as recyclable catalytic scaffolds for tyrosinase-catalyzed biodegradation of catechol. Crosslinked tyrosinase in Mag-SBA-15, prepared in a two step process of tyrosinase adsorption and crosslinking, was stable enough for catechol degradation with no serious loss of enzyme activity. Considering these results of cleaning up water from toxic inorganic and organic contaminants, magnetic mesoporous materials have a great potential to be employed for the removal of environmental contaminants and potentially for the application in large-scale wastewater treatment plants.
authors.affiliation: Environment Sensor System Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea.
authors.forename: Byoung Chan
authors.initials: BC
authors.lastname: Kim
authors.forename: Jinwoo
authors.initials: J
authors.lastname: Lee
authors.forename: Wooyong
authors.initials: W
authors.lastname: Um
authors.forename: Jaeyun
authors.initials: J
authors.lastname: Kim
authors.forename: Jin
authors.initials: J
authors.lastname: Joo
authors.forename: Jin Hyung
authors.initials: JH
authors.lastname: Lee
authors.forename: Ja Hun
authors.initials: JH
authors.lastname: Kwak
authors.forename: Jae Hyun
authors.initials: JH
authors.lastname: Kim
authors.forename: Changha
authors.initials: C
authors.lastname: Lee
authors.forename: Hongshin
authors.initials: H
authors.lastname: Lee
authors.forename: R Shane
authors.initials: RS
authors.lastname: Addleman
authors.forename: Taeghwan
authors.initials: T
authors.lastname: Hyeon
authors.forename: Man Bock
authors.initials: MB
authors.lastname: Gu
authors.forename: Jungbae
authors.initials: J
authors.lastname: Kim
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D002244:Carbon / Q000032:analysis / Q000737:chemistry; D002396:Catechols / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000737:chemistry; D052918:Environmental Restoration and Remediation; D005290:Ferric Compounds / Q000737:chemistry; D005456:Fluorescent Dyes / Q000032:analysis; D015386:Hazardous Substances; D008280:Magnetics; D014442:Monophenol Monooxygenase / Q000737:chemistry; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D002396:Catechols; D003432:Cross-Linking Reagents; D005290:Ferric Compounds; D005456:Fluorescent Dyes; D015386:Hazardous Substances; C509969:SBA-15; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D002244:Carbon; D012822:Silicon Dioxide; D014442:Monophenol Monooxygenase; C034221:catechol