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<p>The modification of raw <i>Vigna subterranean</i> husks (RVSH) to produce carbonized <i>Vigna subterranean</i> husks (CVSH) and esterified <i>Vigna subterranean</i> husks (EVSH) with higher sorption capacities required for effective oil sorption in marine environment was reported. The API gravity of the sorbate employed was 36.50° which is within the range for light petroleum. The sorbents were characterized and sorption of oil realized by batch methodology. Kinetic and isotherm modelling along with thermodynamics were carried out to ascertain the mechanisms of removal of the petroleum onto the sorbents. For isotherm, Langmuir model fitted best based on their surpassing R<sup>2</sup> and smaller <i>χ</i><sup><i>2</i></sup> and SSE values in relation to other models, with maximum monolayer removal capacities of 3.79, 4.67 and 4.97&#xa0;g/g for RVSH, CVSH and EVSH correspondingly. For kinetics, the best suited model was pseudo-second-order, also owing to their surpassing R<sup>2</sup> values at stable sorption time of 70, 60 and 50&#xa0;min for RVSH, CVSH and EVSH respectively. Thermodynamics revealed a physicochemical mechanism and non-spontaneous for RVSH, spontaneous for CVSH and EVSH; and arbitrary rise in particulate movement at the oil-sorbent border. Regeneration and reusability were satisfactory with modified sorbents and have greater potentials for oil spill treatment than raw sample.</p>

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Sequestration of Crude Oil from Contaminated Water using High Capacity Sorbents Obtained from the Thermal Treatment and Chemical Modification of Vigna subterranean Husks: Modeling, Thermodynamics, Regeneration and Reusability

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Ikeokwu Chris Ogbu,
  • Abib Lawal,
  • Abduljeleel Osunkunle

摘要

The modification of raw Vigna subterranean husks (RVSH) to produce carbonized Vigna subterranean husks (CVSH) and esterified Vigna subterranean husks (EVSH) with higher sorption capacities required for effective oil sorption in marine environment was reported. The API gravity of the sorbate employed was 36.50° which is within the range for light petroleum. The sorbents were characterized and sorption of oil realized by batch methodology. Kinetic and isotherm modelling along with thermodynamics were carried out to ascertain the mechanisms of removal of the petroleum onto the sorbents. For isotherm, Langmuir model fitted best based on their surpassing R2 and smaller χ2 and SSE values in relation to other models, with maximum monolayer removal capacities of 3.79, 4.67 and 4.97 g/g for RVSH, CVSH and EVSH correspondingly. For kinetics, the best suited model was pseudo-second-order, also owing to their surpassing R2 values at stable sorption time of 70, 60 and 50 min for RVSH, CVSH and EVSH respectively. Thermodynamics revealed a physicochemical mechanism and non-spontaneous for RVSH, spontaneous for CVSH and EVSH; and arbitrary rise in particulate movement at the oil-sorbent border. Regeneration and reusability were satisfactory with modified sorbents and have greater potentials for oil spill treatment than raw sample.