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<p>Hexavalent chromium is one of the most common heavy metal, prevalent industrial wastes. Biosorption techniques using active and dead microorganisms on biochar can be employed to remediate effluents heavy metals. This research encompasses the removal of Cr (VI) from metal solutions using biochar colonized by an indigenous Cr resistant strain of <i>Trichoderma asperellum</i> (OM990850). The fungus was used as live biosorbent (Lb) and dead biosorbent (Db) colonizing the rice husk biochar (BC), as well as without biochar. Batch biosorption experiments considering pH, contact time, and initial metal concentration were carried out to observe the efficiency and mechanism of the sorption. Removal efficiency of Cr (VI) by Lb colonized BC was the highest (98%), followed by Lb (94%). Additionally, the metal uptake capacity of Lb and Lb + BC (274.9, 300 mgg<sup>−1,</sup> respectively) was also high. The Cr (VI) sorption was high at lower pH (2.0–4.0 pH). Two adsorption isotherm models were employed to investigate the efficacy of the process. The Langmuir non-linear model was the best fit for Lb and Lb + BC, and BC treatments (R<sup>2</sup> = 0.978, 0.997, 0.986, respectively), while the Freundlich model was a better fit for Db, Db + BC treatments (R<sup>2</sup> = 0.982 and 0.982, 0.967, respectively). Pseudo-second-order kinetic model was found to be the best fit with the obtained experimental data. <i>Trichoderma asperellum</i> impregnated biochar proved to be an effective, sustainable, cost-effective and eco-friendly biosorbent for removing Cr (VI) from industrial effluents and future commercialization.</p>

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Trichoderma Impregnated Biochar for Removal of Cr (VI) from Aqueous Solutions

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Sana Afzal,
  • Sobia Mushtaq,
  • Firdaus e Bareen,
  • Aisha Nazir

摘要

Hexavalent chromium is one of the most common heavy metal, prevalent industrial wastes. Biosorption techniques using active and dead microorganisms on biochar can be employed to remediate effluents heavy metals. This research encompasses the removal of Cr (VI) from metal solutions using biochar colonized by an indigenous Cr resistant strain of Trichoderma asperellum (OM990850). The fungus was used as live biosorbent (Lb) and dead biosorbent (Db) colonizing the rice husk biochar (BC), as well as without biochar. Batch biosorption experiments considering pH, contact time, and initial metal concentration were carried out to observe the efficiency and mechanism of the sorption. Removal efficiency of Cr (VI) by Lb colonized BC was the highest (98%), followed by Lb (94%). Additionally, the metal uptake capacity of Lb and Lb + BC (274.9, 300 mgg−1, respectively) was also high. The Cr (VI) sorption was high at lower pH (2.0–4.0 pH). Two adsorption isotherm models were employed to investigate the efficacy of the process. The Langmuir non-linear model was the best fit for Lb and Lb + BC, and BC treatments (R2 = 0.978, 0.997, 0.986, respectively), while the Freundlich model was a better fit for Db, Db + BC treatments (R2 = 0.982 and 0.982, 0.967, respectively). Pseudo-second-order kinetic model was found to be the best fit with the obtained experimental data. Trichoderma asperellum impregnated biochar proved to be an effective, sustainable, cost-effective and eco-friendly biosorbent for removing Cr (VI) from industrial effluents and future commercialization.