title: SO2 gas adsorption by modified kaolin clays: influence of previous heating and time acid treatments.
abstract: Modified kaolin clays were used as adsorbents for SO(2) gas adsorptions. The clays were heated up to 900 °C previous to acid treatments with 0.5 N sulfuric acid solutions at boiling temperature during different times up to 1440 min. Equilibrium adsorption at 25 °C and 0.1 MPa was carried out by using a volumetric apparatus. The samples were characterized by chemical analysis, X-ray diffraction and infrared analysis. The heating of the clays followed by acid treatment improved the adsorption capacity of the kaolin clays. The presence of amorphous silica and hydroxyl in the final products improved SO(2) adsorption capacity. Better properties for SO(2) adsorption were found in kaolin rich in not well ordered kaolinite clay mineral.
authors.affiliation: Centro de Tecnología de Recursos Minerales y Cerámica, CONICET La Plata-CICPBA, CC 49, Cno Centenario y 506, 1897 MB Gonnet, Prov Buenos Aires, Argentina. volzcris@netverk.com.ar
authors.forename: Cristina
authors.initials: C
authors.lastname: Volzone
authors.forename: Jose
authors.initials: J
authors.lastname: Ortiga
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D000077215:Clay; D004785:Environmental Pollutants; D006361:Heating; D006358:Hot Temperature; D007616:Kaolin / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013458:Sulfur Dioxide / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*
chemical_list: D000538:Aluminum Silicates; D004785:Environmental Pollutants; D012996:Solutions; D013464:Sulfuric Acids; D013458:Sulfur Dioxide; D007616:Kaolin; D012822:Silicon Dioxide; C033158:sulfuric acid; D000077215:Clay