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Adsorptive Removal of As(III) from Aqueous Solution by Raw Coconut Husk and Iron Impregnated Coconut Husk: Kinetics and Equilibrium Analyses

  • Shashi Bala Gautam EMAIL logo , Mohd. Siraj Alam and Suantak Kamsonlian
Published/Copyright: November 11, 2016
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International Journal of Chemical Reactor Engineering
From the journal International Journal of Chemical Reactor Engineering Volume 15 Issue 2

Abstract

As(III) removal from aqueous solution was conducted using low-cost adsorbents like unmodified raw coconut husk (RCH) and modified iron impregnated coconut husk (IICH). Prepared both adsorbents was characterisation by using elemental analyses, FTIR, TGA, SEM and EDX. The analysis behaviour indicates, both adsorbents are highly suitability for As(III) removal. The effects of operational parameters, such as pH, adsorbent dose and initial concentration on these adsorbents were investigated and compared with other agriculture based adsorbent. The result reveals that the As(III) removal capacity is effective in the pH range of 6.2–7.8 and the optimum pH and adsorbents dose was found as 7.0 and 40 g l−1, for RCH and IICH, respectively. Kinetic and equilibrium studies over a wide range of operating conditions are tested to evaluate the effectiveness of RCH and IICH to remove As(III) from water. The values of both kf1 and ks2 values are found to be nearly same and same trend was observed at higher 50 mg l−1 and lower arsenic concentration 25 mg l−1 for RCH and IICH. But the kinetic data is fitted better in the pseudo-second-order kinetic model than the pseudo-first order model. The effective intraparticle diffusion coefficient of As(III) ions in RCH and IICH is observed to be 2.145×10−9 cm2 s−1 and 1.838×10−10 cm2 s−1, which indicates that the overall As(III) adsorption on both adsorbents are intraparticle diffusion control. Equilibrium isotherms for the adsorption of As(III) on RCH and IICH were analyzed at different dose and different initial concentration. At different concentration system, Freundlich isotherm and Redlich-Peterson are best fitted followed by Langmuir and Temkin isotherm models and for varying doses, all equilibrium models give almost similar fitness.

Keywords: adsorption; As(III); RCH; IICH; isotherms; kinetics

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Published Online: 2016-11-11
Published in Print: 2017-04-01

© 2017 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/ijcre-2016-0097
Keywords for this article
adsorption; As(III); RCH; IICH; isotherms; kinetics

Articles in the same Issue

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  2. Genetic Programming based Drag Model with Improved Prediction Accuracy for Fluidization Systems
  3. Catalytic Photodegradation of Rhodamine B in the Presence of Natural Iron Oxide and Oxalic Acid under Artificial and Sunlight Radiation
  4. Esterification of Lauric Acid with Glycerol in the Presence of STA/MCM-41 Catalysts
  5. Existence of Synergistic Effects During Co-pyrolysis of Petroleum Coke and Wood Pellet
  6. Photocatalytic Treatment of Binary Mixture of Dyes using UV/TiO2 Process: Calibration, Modeling, Optimization and Mineralization Study
  7. Aqueous Phase Biosorption of Pb(II), Cu(II), and Cd(II) onto Cabbage Leaves Powder
  8. Design and Simulation of a Chaotic Micromixer with Diamond-Like Micropillar Based on Artificial Neural Network
  9. Experimentally Validated CFD Model for Gas-Liquid Flow in a Round-Bottom Stirred Tank Equipped with Rushton Turbine
  10. Pyrolysis Products Characterization and Dynamic Behaviors of Hydrothermally Treated Lignite
  11. Pd/ZrO2: An Efficient Catalyst for Liquid Phase Oxidation of Toluene in Solvent Free Conditions
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  13. Mathematical Modeling of Carbon Nanotubes Formation in Fluidized Bed Chemical Vapor Deposition
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  16. Synthesis and Optical Properties of Sb-Doped CdS Photocatalysts and Their Use in Methylene Blue (MB) Degradation
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