title: Adsorption of Cu2+ on spherical Fe-MCM-41 and its application for oxidation of adamantane.
abstract: Fe-MCM-41 with varying Si/Fe ratios (20, 50, 70 and 90) were prepared by using cetyltrimethylammoniumbromide (CTAB) as the structure-directing agent (SDA), tetraethylorthosilicate (TEOS) as the silica source and ethanol as co-surfactant in alkaline medium. The characterization was done by SEM; UV-vis diffused reflectance and FT-IR. Adsorption of copper solutions with varying parameters such as concentration, temperature and pH were performed over Fe-MCM-41 samples. The experimental data fitted well to the Langmuir and Freundlich adsorption isotherm. Fe-MCM-41 having Si/Fe ratio (90) showed highest copper adsorption capacity at pH 5.5, Cu(2+) concentration of 59.6 ppm and temperature 323 K. Fe-MCM-41(90)-Cu(59.6) was tested as a catalyst for oxidation of adamantane using hydrogen peroxide as the oxidant. The GC analyses revealed significant conversion of 32.5% and selectivity of 54% towards formation of 1-adamantanol.
authors.affiliation: Colloids and Material Chemistry Department, Institute of Minerals and Materials, Technology (CSIR), Bhubaneswar 751013, Orissa, India. paridakulamani@yahoo.com
authors.forename: K M
authors.initials: KM
authors.lastname: Parida
authors.forename: Suresh K
authors.initials: SK
authors.lastname: Dash
mesh_terms: D000218:Adamantane / Q000737:chemistry*; D000327:Adsorption; D002384:Catalysis; D003300:Copper / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D058085:Iron Compounds / Q000737:chemistry*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D010084:Oxidation-Reduction; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature
chemical_list: D058085:Iron Compounds; D012996:Solutions; D012822:Silicon Dioxide; D003300:Copper; D000218:Adamantane