title: Mesoporous Nb2O5/SiO2material obtained by sol-gel method and applied as adsorbent of crystal violet dye.
abstract: In this work, SiO2/Nb2O5(SiNb) material was prepared using sol-gel method and employed as adsorbent for removal of crystal violet dye (CV). The material was characterized using nitrogen adsorption-desorption isotherms, FTIR spectroscopy, pHpzc, and SEM-EDS. The analysis of N2isotherms revealed the presence of micro- and mesopores in the SiNb sample with specific surface area as high as 747 m2g-1. For the CV adsorption process, variations of several parameters such as of pH, temperature, contact time, and concentration of dye of the process were evaluated. The optimum initial pH of the CV dye solution was 7.0. The adsorption kinetic and equilibrium data for CV adsorption were suitably represented by the general-order and Liu models, respectively. The maximum adsorption capacity of the CV dye by SiNb was achieved at 303 K, which attained 116 mg g-1at this temperaure. Dye effluents were simulated and used to check the applicability of the SiNb material for treatment of effluents - the material showed very good efficiency for decolorization of dye effluents.
authors.affiliation: a Institute of Chemistry , Federal University of Rio Grande do Sul (UFRGS) , Porto Alegre , RS , Brazil.
authors.forename: Cibele S
authors.initials: CS
authors.lastname: Umpierres
authors.affiliation: a Institute of Chemistry , Federal University of Rio Grande do Sul (UFRGS) , Porto Alegre , RS , Brazil.
authors.forename: Lizie D T
authors.initials: LD
authors.lastname: Prola
authors.affiliation: b Department of Chemistry , Federal University of Agriculture , Abeokuta , Ogun State , Nigeria.
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Adebayo
authors.affiliation: a Institute of Chemistry , Federal University of Rio Grande do Sul (UFRGS) , Porto Alegre , RS , Brazil.
authors.forename: Eder C
authors.initials: EC
authors.lastname: Lima
authors.affiliation: a Institute of Chemistry , Federal University of Rio Grande do Sul (UFRGS) , Porto Alegre , RS , Brazil.
authors.forename: Glaydson S
authors.initials: GS
authors.lastname: Dos Reis
authors.affiliation: a Institute of Chemistry , Federal University of Rio Grande do Sul (UFRGS) , Porto Alegre , RS , Brazil.
authors.forename: Diego D F
authors.initials: DD
authors.lastname: Kunzler
authors.affiliation: c Chemical Engineering Department , Federal University of Santa Maria (UFSM) , Santa Maria , RS , Brazil.
authors.forename: G L
authors.initials: GL
authors.lastname: Dotto
authors.affiliation: a Institute of Chemistry , Federal University of Rio Grande do Sul (UFRGS) , Porto Alegre , RS , Brazil.
authors.forename: Leliz T
authors.initials: LT
authors.lastname: Arenas
authors.affiliation: a Institute of Chemistry , Federal University of Rio Grande do Sul (UFRGS) , Porto Alegre , RS , Brazil.
authors.forename: Edilson V
authors.initials: EV
authors.lastname: Benvenutti
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry*; D005782:Gels; D005840:Gentian Violet / Q000737:chemistry*; D007700:Kinetics; D009556:Niobium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D004396:Coloring Agents; D005782:Gels; D010087:Oxides; D014874:Water Pollutants, Chemical; D009556:Niobium; D012822:Silicon Dioxide; D005840:Gentian Violet; C073337:niobium pentoxide
keywords: Mesoporous SiO2/Nb2O5; adsorption process; crystal violet dye; simulated effluents; sol–gel method