KINETIC AND THERMODYNAMIC STUDIES OF REMOVAL OF 2-NITROPHENOL FROM AQUEOUS SOLUTION USING COWPEA HUSK POWDER TETHERED ON IRON OXIDE.

Authors

  • A. E. Adeniji
  • F. J. Osundiran
  • O. G. Ayoola
  • A.I. Adeogun
  • A.I. Adeogun
  • M.A. Idowu

DOI:

https://doi.org/10.46602/jcsn.v46i6.676

Abstract

The uptake of 2-nitrophenol (2NP) from aqueous solution onto cowpea husk powder tethered on iron oxide (CHPI) and pristine cowpea husk powder (CHP) for comparison was investigated under different experimental conditions such as, initial adsorbate concentration, adsorbent dose, contact time, solution pH and temperature using UV-Visible spectrophotometer. Adsorption isotherms were described using the Langmuir and Freundlich models. The experimental data fitted into Freundlich isotherm equation, indicating monolayer adsorption of the adsorbate on the surface of the adsorbent. Kinetic evaluations showed that the adsorption mechanism of the iron tethered cowpea husk powder was well described by the Lagergren pseudo-first-order model with rate constant increasing with initial adsorbate concentration and evaluated to be 9.4x10-3 g·mg−1·min−1 for CHPI and 1.67x10-2 g·mg−1·min−1 for CHP respectively; showing the iron tethered cowpea husk powder as a better adsorbent. The evaluations of enthalpy, entropy and free energy changes revealed that the adsorption processes were spontaneous and endothermic in nature. The study revealed that both adsorbents studied behaved considerably well with an added advantage of convenient adsorbent separation with use of the iron tethered cowpea husk powder.

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Published

2021-12-31

How to Cite

Adeniji, A. E. ., Osundiran, F. J. ., Ayoola, O. G. ., Adeogun, A. ., Adeogun, A. ., & Idowu, M. . (2021). KINETIC AND THERMODYNAMIC STUDIES OF REMOVAL OF 2-NITROPHENOL FROM AQUEOUS SOLUTION USING COWPEA HUSK POWDER TETHERED ON IRON OXIDE . Journal of Chemical Society of Nigeria, 46(6). https://doi.org/10.46602/jcsn.v46i6.676