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: 2.72). 08/2010; 91(8):1695-706. DOI: 10.1016/j.jenvman.2010.03.013
Source: PubMed


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.

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    • "The dyes are discharged from sources such as textile, paper, leather and plastic industries [1]. Dyes are compounds with complex aromatic structure which are widespread used to make colour to other substances [2]. Synthetic dyes are widely applied by industries due to their cost-effective and ease of fabrication and formulation compared with natural dyes [3]. "
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    • "Temperature was varied the from 293 K to 1273 K (acquisition time of 1 point per 5 s) with a mass of 10.00–15.00 mg of solid [27]. X-ray diffractions (XRD) (Philips X'pert MPD diffractometer, Netherlands) at 40 kV and 40 mA with Cu Ka radiation (k = 1.5406 "
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    • "This intrinsic property makes reactive dyes non-biodegradable and stable [12]. Due to global strict regulations [3], it is obligatory to treat the wastewaters emanating from the fabric industries before being discharged into the environment [13] [14] [15]. This obligation has led to quest for simple, cheap and ecofriendly techniques for the removal of dyes from aqueous effluents [15] [16]. "
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