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.

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.
Journal of Environmental Management (Impact Factor: 3.06). 08/2010; 91(8):1695-706. DOI: 10.1016/j.jenvman.2010.03.013
Source: PubMed

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.

1 Bookmark
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Adsorption is the most versatile and widely applied method for water and wastewater treatment due to their economic, simple in operation and efficient process. The aim of this study is to introduce a new approach on adsorption application that are tailored to operator’s requirement and make full use of the existing facilities. The current work will evaluate the feasibility performance of a thin coated adsorbent layer specifically design for colour removal in wastewater. This laboratory-scale experiments reported on the preparation of adsorbent coating layer named Paintosorp. Paintosorp coated on the surface of the glass and tested for its adsorption performance using methylene blue (MB) dye in batch scale. The adsorption process was investigated by varying the initial dye concentration, pH and temperature. The percentage removal of MB was found to be 99% for all concentrations of 50, 100, 150 and 200 mg/l upon achieved equilibrium within 4–20 h for the surface area approximately 0.03 m2 of coated Paintosorp. Equilibrium data were simulated using Langmuir, Freundlich and Temkin isotherm models. Kinetic modelling was fitted to the pseudo-first-order and pseudo-second order equation, while adsorption mechanism was determined using the intraparticle diffusion model. The finding revealed the potential of Paintosorp as a viable coating adsorbent for future wastewater treatment technology as easily incorporated with plant’s existing facilities and can be tailored to the customer’s needs.
    Desalination and water treatment 05/2014; · 0.99 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Removal of Basic Red 46 from aqueous media was achieved onto Animal Bone Meal as a new low cost adsorbent. The latter was characterized by Infra-Red and X-ray diffraction. The adsorption of Basic Red 46 was occurred by studying the effects of adsorbent amount, dye concentration, contact time, pH media and temperature. The adsorption rate data were analyzed using the pseudo-first order and the pseudo-second order kinetics models to determine adsorption rate constants. The isotherms of adsorption data were analyzed by both adsorption isotherm models Langmuir and Freundlich. The monolayer adsorption capacity is 76 mg/g of animal bone meal. Nearly 30 minutes of contact time was found to be sufficient for the dye adsorption to reach equilibrium. Thermodynamic parameters were also evaluated for the dye-adsorbent system and revealed that the adsorption process is endothermic in nature. All results found concluded that animal bone meal could be effectively employed as effective new low cost adsorbent for the removal textile dyes from aqueous solutions.
    01/2012; 18(3).
  • [Show abstract] [Hide abstract]
    ABSTRACT: In the present study, activated carbons were prepared from sisal fiber (Agave sisalana sp.) and pomegranate peel (Punica granatum sp.) using phosphoric acid as the activating agent. Both sisal fiber activated carbon (SFAC) and pomegranate peel activated carbon (PPAC) were characterized using methylene blue number, iodine number, BET surface area, SEM, and FTIR. The BET surface area of the SFAC and PPAC were 885 and 686 m2/g, respectively. The adsorption studies using C.I. Reactive Orange 4 dye on the SFAC and PPAC were carried out. The effects of time, initial adsorbate concentration, pH, and temperature on the adsorption were studied. The isotherm studies were carried and it was found that the Langmuir and Freundlich isotherms fit well for the adsorption of RO 4 on SFAC, while adsorption of RO 4 on PPAC is better represented by the Langmuir and Temkin isotherms. Adsorption kinetics of adsorption was determined using pseudo first order, pseudo second order, Elovich and intraparticle diffusion models and it was found that the adsorption process follows pseudo second order model. Thermodynamics parameters such as changes in free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) were determined by using van't Hoff equation. The positive ΔH value indicates that RO 4 dye adsorption on SFAC and PPAC is endothermic in nature.
    CLEAN - Soil Air Water 08/2013; 41(8). · 2.05 Impact Factor


Available from
May 16, 2014