title: Organofunctionalized Amazon smectite for dye removal from aqueous medium--kinetic and thermodynamic adsorption investigations.
abstract: The objective of this study is to examine the adsorption behavior of Sumifix Brilliant Orange 3R textile dye from aqueous solution on smectite sample, an abundant Amazon clay. The original smectite clay mineral has been collected from Amazon region, Brazil. The compound 2-aminomethylpyridine was anchored onto smectite surface by heterogeneous route. The ability of these materials to remove the Sumifix Brilliant Orange 3R textile dye from aqueous solution was followed by a series of adsorption isotherms, using a batchwise process. The maximum number of moles adsorbed was determined to be 1.26 and 2.07 mmol g(-1) for natural and modified clay samples, respectively. The energetic effects caused by dye cations adsorption were determined through calorimetric titrations. Thermodynamics indicated the existence of favorable conditions for such dye-nitrogen interactions.
authors.affiliation: Universidade Federal de Mato Grosso, DRM-UFMT, Mato Grosso, Brazil. denis@cpd.ufmt.br
authors.forename: Denis L
authors.initials: DL
authors.lastname: Guerra
authors.forename: Weber L L
authors.initials: WL
authors.lastname: Silva
authors.forename: Helen C P
authors.initials: HC
authors.lastname: Oliveira
authors.forename: Rúbia R
authors.initials: RR
authors.lastname: Viana
authors.forename: Claudio
authors.initials: C
authors.lastname: Airoldi
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D017640:Silicates / Q000737:chemistry*; D013816:Thermodynamics; D014867:Water
chemical_list: D004396:Coloring Agents; D017640:Silicates; D014867:Water; C033214:Smectite