Article

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
 · 
235 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A macromolecule, CML, was obtained by purifying and carboxy-methylating the lignin generated from acid hydrolysis of sugarcane bagasse during bioethanol production from biomass. The CMLs complexed with Al(3+) (CML-Al) and Mn(2+) (CML-Mn) were utilised for the removal of a textile dye, Procion Blue MX-R (PB), from aqueous solutions. CML-Al and CML-Mn were characterised using Fourier transform infrared spectroscopy (FTIR), scanning differential calorimetry (SDC), scanning electron microscopy (SEM) and pHPZC. The established optimum pH and contact time were 2.0 and 5h, respectively. The kinetic and equilibrium data fit into the general order kinetic model and Liu isotherm model, respectively. The CML-Al and CML-Mn have respective values of maximum adsorption capacities of 73.52 and 55.16mgg(-1) at 298K. Four cycles of adsorption/desorption experiments were performed attaining regenerations of up to 98.33% (CML-Al) and 98.08% (CML-Mn) from dye-loaded adsorbents, using 50% acetone+50% of 0.05molL(-1) NaOH. The CML-Al removed ca. 93.97% while CML-Mn removed ca. 75.91% of simulated dye house effluents.
    Journal of hazardous materials 01/2014; 268C:43-50. · 4.14 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Jatropha curcas shell an abundant residue of the biocombustible industry, was used in its natural form (JN) and treated by non-thermal plasma (JP) as biosorbents for the removal of Reactive Red 120 (RR-120) dye from its aqueous solutions. These biosorbents were characterized by infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and by nitrogen adsorption/desorption curves. The effects of pH, shaking time and temperature on adsorption capacity were studied. In the acidic pH region (pH 2.0), the adsorption of the dye was favorable using both adsorbents. The contact time to obtain equilibrium isotherms at 298–323 K was fixed at 10 h for both biosorbents. The general order kinetic model provided the best fit to the experimental data compared with pseudo-first order and pseudo-second order kinetic adsorption models. For RR-120 dye, the equilibrium data (298–323 K) were best fitted to the Liu isotherm model. The maximum sorption capacity for adsorption of the dye occurred at 323 K, attaining values of 40.94 and 65.63 mg g−1 for JN and JP, respectively. Simulated dyehouse effluents were used to check the applicability of the proposed biosorbents for effluent treatment (removal of 68.2 and 94.6%, for JN and JP, respectively) in a medium with high saline concentration.
    Industrial Crops and Products 04/2013; 46:328– 340. · 3.21 Impact Factor
  • 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; · 0.85 Impact Factor

Full-text

View
84 Downloads
Available from
May 16, 2014