title: Textile dye removal from aqueous solutions by malt bagasse: Isotherm, kinetic and thermodynamic studies.
abstract: The biosorption of orange solimax TGL 182% (OS-TGL) textile dye onto new and low cost biossorbent (malt bagasse) in aqueous solutions was investigated. The malt bagasse was characterized by Fourier transform infrared spectroscopy and specific surface area (BET method).Batch biosorption experiments were conducted in order to determine the following parameters: particles size, pH, agitation speed, temperature, contact time, biomass dosage, influence of the ionic strength and, finally, the influence of other textile dye on the OS-TGL biosorption. The optimum conditions for OS-TGL removal were obtained at pH 1.5, agitation speed of 150rpm, contact time of 180min and biomass dosage 2, 8gL(-1). The results show that the kinetics of biosorption followed a pseudo-second-order model and by increasing the temperature from 293 up to 313K, the biosorption capacity was improved. The Langmuir model showed better fit and the estimated biosorption capacity was 23.2mgg(-1). The negative values of Gibbs free energy, ΔG°, and positive value of enthalpy, ΔH°, confirm the spontaneous nature and endothermic character of the biosorption process. The results of the ionic strength effect indicated that the biosorption process under study had a strong tolerance in high salt concentrations. The removal capacity (>95%) was not affected with the presence of other textile dyes.
authors.affiliation: Chemical Engeneering Department-Federal University of Technology-Paraná, Ponta Grossa Campus, 84016-210 Ponta Grossa, PR, Brazil.
authors.forename: Klaiani B
authors.initials: KB
authors.lastname: Fontana
authors.affiliation: Chemical Engeneering Department-Federal University of Technology-Paraná, Ponta Grossa Campus, 84016-210 Ponta Grossa, PR, Brazil.
authors.forename: Eduardo S
authors.initials: ES
authors.lastname: Chaves
authors.affiliation: Chemical Engeneering Department-Federal University of Technology-Paraná, Ponta Grossa Campus, 84016-210 Ponta Grossa, PR, Brazil.
authors.forename: Jefferson D S
authors.initials: JDS
authors.lastname: Sanchez
authors.affiliation: Chemical Engeneering Department-Federal University of Technology-Paraná, Ponta Grossa Campus, 84016-210 Ponta Grossa, PR, Brazil.
authors.forename: Erica R L R
authors.initials: ERLR
authors.lastname: Watanabe
authors.affiliation: Chemical Engeneering Department-Federal University of Technology-Paraná, Ponta Grossa Campus, 84016-210 Ponta Grossa, PR, Brazil.
authors.forename: Juliana M T A
authors.initials: JMTA
authors.lastname: Pietrobelli
authors.affiliation: Chemical Engeneering Department-Federal University of Technology-Paraná, Ponta Grossa Campus, 84016-210 Ponta Grossa, PR, Brazil. Electronic address: gianeg@utfpr.edu.br.
authors.forename: Giane G
authors.initials: GG
authors.lastname: Lenzi
mesh_terms: D000327:Adsorption; D018533:Biomass; D002482:Cellulose; D004396:Coloring Agents / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007700:Kinetics; D010316:Particle Size; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013784:Textiles; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D002482:Cellulose; C027433:bagasse
keywords: Biosorption; Malt bagasse; Orange TGL 182%; Textile dye