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Plasma-modified Triumfetta cordifolia stem bark bio-waste as adsorbent for the removal of crystal violet and ibuprofen from water
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DOI：10.1007/s13399-026-07234-3.png)
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Abstract
En 中文
Dried fibres of Triumfetta cordifolia stem barks were modified by a non-thermal plasma discharge of the glidarc type and characterized by FT-IR, XRD, SEM, and pHPZC. Studies on the influence of solution pH, adsorbent dosage, initial pollutant concentration, and adsorbent particle size on the adsorption of crystal violet (CV) and ibuprofen (Ibu) were performed. The results indicated that the plasma-modified biomass outperformed significantly better than the unmodified biomass-derived adsorbents. The kinetics and isotherms of the adsorption process using pristine and plasma-modified fibres were quantified and modeled. The kinetic curves showed a good fit to the pseudo-second order model and Elovich model for CV and Ibu adsorption, respectively, with equilibrium reached after 60 min. The ideal plasma-modified adsorbent ECM exhibited maximum adsorption capacity of 15.90 mg/g for CV and 90.36 mg/g toward Ibu.The Liu isotherm model was found to be the best fit to the experimental data and, its equilibrium constant was used to determine the adsorption thermodynamic parameters for both pollutants. The determined parameters, including enthalpy change (ΔH° < 0), entropy change (ΔS°>0), and Gibbs free energies change (ΔG° < 0) suggested an exothermic, random, and spontaneous nature of the adsorption process in the temperature range of 298–323 K. Kinetic models and thermodynamic studies suggested multilayer exposure with both physical and chemical forces simultaneously controlling the adsorption of CV and Ibu on the ECM adsorbent. Also, the revival test of the CV- or Ibu-laden adsorbent unveiled a high desorption efficiency up to four adsorption–desorption cycles.
Keywords:
Adsorption
Crystal violet
Ibuprofen
Plasma
Triumfetta cordifolia
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4.1
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7.0K
Citations:
2.2W
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