title: Application of carbon adsorbents prepared from Brazilian-pine fruit shell for the removal of reactive orange 16 from aqueous solution: Kinetic, equilibrium, and thermodynamic studies.
abstract: Activated (AC-PW) and non-activated (C-PW) carbonaceous materials were prepared from the Brazilian-pine fruit shell (Araucaria angustifolia) and tested as adsorbents for the removal of reactive orange 16 dye (RO-16) from aqueous effluents. The effects of shaking time, adsorbent dosage and pH on the adsorption capacity were studied. RO-16 uptake was favorable at pH values ranging from 2.0 to 3.0 and from 2.0 to 7.0 for C-PW and AC-PW, respectively. The contact time required to obtain the equilibrium using C-PW and AC-PW as adsorbents was 5 and 4h at 298 K, respectively. The fractionary-order kinetic model provided the best fit to experimental data compared with other models. Equilibrium data were better fit to the Sips isotherm model using C-PW and AC-PW as adsorbents. The enthalpy and entropy of adsorption of RO-16 were obtained from adsorption experiments ranging from 298 to 323 K.
authors.affiliation: Institute of Chemistry, Federal University of Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 9500, Caixa Postal 15003, CEP 91501-970, Porto Alegre, RS, Brazil.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Calvete
authors.forename: Eder C
authors.initials: EC
authors.lastname: Lima
authors.forename: Natali F
authors.initials: NF
authors.lastname: Cardoso
authors.forename: Júlio C P
authors.initials: JC
authors.lastname: Vaghetti
authors.forename: Silvio L P
authors.initials: SL
authors.lastname: Dias
authors.forename: Flavio A
authors.initials: FA
authors.lastname: Pavan
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000302:isolation & purification*; D001938:Brazil; D002244:Carbon / Q000493:pharmacokinetics*; D004396:Coloring Agents / Q000302:isolation & purification*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D015233:Models, Statistical; D009754:Nuts; D028223:Pinus; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D014874:Water Pollutants, Chemical; C483723:reactive orange 16; D002244:Carbon