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Rice husk ash as an adsorbent for methylene blue—effect of ashing temperature

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Abstract

Utilization of one waste material to control pollution caused by another is of high significance in the remediation of environmental problems. Rice husk, an abundantly available agricultural waste, can be used as a low cost adsorbent for dyes and heavy metals in effluent streams. The possible utilization of rice husk ash as an adsorbent for methylene blue dye from aqueous solutions has been investigated. Ash samples from husks of two origins were prepared at different temperatures and their physical, chemical spectroscopic and morphological properties were determined. XRD, FTIR and SEM were some of the techniques adopted for the characterization. The samples were also analyzed for bulk density, pH, nitrogen adsorption properties and lime reactivity. Experiments of methylene blue adsorption on the ash samples were conducted using batch technique and a comparative study was made. Results were analyzed using linear, Langmuir and Freundlich isotherms. The values of separation factor indicate that most of the ash samples do adsorb the dye molecules, but in varying quantities. Calcination at 900∘C reduces the adsorption capacity of the ash to a great extent. Regression analysis shows that the experimental data fits both Langmuir and Freundlich isotherms for certain concentration limits. The adsorbate species are most probably transported from the bulk of the solution into the solid phase through intra-particle diffusion process. Kinetics of adsorption was found to follow pseudo second order rate equation with R 2∼ 0.99. The highest adsorption capacity (Q 0) achieved is found to be ∼690 mg/g, which is even higher than the values reported for activated carbon from rice husk. The adsorption capacity of the ash samples are in good agreement with their surface area and pore volume.

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Authors and Affiliations

  1. Regional Research Laboratory (CSIR), Industrial Estate, P.O. Thiruvananthapuram, Kerala, India, 695 019

    Sathy Chandrasekhar & P. N. Pramada

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  1. Sathy Chandrasekhar
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  2. P. N. Pramada
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Correspondence to Sathy Chandrasekhar.

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Chandrasekhar, S., Pramada, P.N. Rice husk ash as an adsorbent for methylene blue—effect of ashing temperature. Adsorption 12, 27–43 (2006). https://doi.org/10.1007/s10450-006-0136-1

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  • DOI: https://doi.org/10.1007/s10450-006-0136-1

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