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The utilization of okra leaves as an agricultural waste for the removal of As(III) and As(V)

  • Authors (legacy)
    Corresponding: Chandio Zaheer Ahmed
    Co-authors: Mazhar Iqbal Khaskheli
    Zaheer Ahmed Chandio
    Shaista Khan
    Faiz Muhammad Khokhar
    Abdul Ghani Memon
    Wahid Bux Jatoi
    Laeeq A. K. Khokhar
    Nafeesa Khatoon Shahani
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  • gnest_03321_published.pdf
  • Paper ID
    gnest_03321
  • Paper status
    Published
  • Date paper submitted
  • Date paper accepted
  • Date paper online
DOI
https://doi.org/10.30955/gnj.003321
Graphical abstract
Abstract

In the present study the sorption efficiency of okra leave sorbent for As(III) and As(V) is demonstrated. Sorption reaction is pH and time dependent. The sorbent shows maximum removal of As(III) and As(V) at pH 7 and pH 6 respectively and equilibrium was achieved at 180 minutes. In isotherm study experimental data were explained by Freundlich and Flory-Huggins models. Maximum sorption capacities calculated by Freundlich Isotherm were 5672.0 μg g-1 and 13160 μg g-1 for As(III) and As(V) respectively. Psuedo-second order rate equation and Morris-Weber equation explained the kinetics of sorption reaction. Due to the presence of heterogeneous active sites on the sorbent, surface sorption as well as intra-particle diffusion occurred. Thermodynamically, sorption reaction was endothermic in nature and proceeded spontaneously. Desorption study revealed that 89.82% of As(III) and 97.11% of As(V) were removed with 1M HCl.

Keywords
Okra sorption arsenic Equilibrium Thermodynamics
Cite this article
Ahmed, C.Z. et al. (2021) “The utilization of okra leaves as an agricultural waste for the removal of As(III) and As(V)”, Global NEST Journal, 23(2). Available at: https://doi.org/10.30955/gnj.003321.
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  • gnest_03321_published.pdf