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<p>The disposal of sewage sludge is a crucial issue in post-water treatment. Ferric dyeing sludge mainly stems from the purification procedure of textile industry effluent. This work aimed to reduce, detoxify and reclaim this waste by pyrolyzing it into magnetic biochar (MBC), thereby facilitating the depollution of hexavalent chromium (Cr(VI)) from water. The influence of temperature on the basic property and removal performance of biochar was studied. SEM, N<sub>2</sub> adsorption–desorption, FTIR, XRD and VSM were employed to analyze the character of MBC. Results indicated that the MBC had a high specific surface area of 181.09 m<sup>2</sup>/g as well as good magnetism, and showed satisfactory removal performance for Cr(VI) under acidic condition. The removal behavior was suitably described by pseudo-second-order, Elovich and Temkin models, hinting its chemisorption-based feature. Mechanistic study demonstrated that adsorption and reduction all contributed to the removal process. Furthermore, the MBC possessed good anti-interference ability and reusability. The cost–benefit and carbon footprint analyses suggested the good economic feasibility and environmental friendliness of MBC as an adsorbent. This work promotes the sustainable management of ferric dyeing sludge while simultaneously aiding in water remediation.</p>

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Magnetic biochar derived from ferric textile dyeing sludge: hexavalent chromium detoxification performance, mechanism and sustainability evaluation

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • M. Mei,
  • X. Liao,
  • R. Guo,
  • L. Xu,
  • Y. Zhang,
  • K. Li,
  • W. Li

摘要

The disposal of sewage sludge is a crucial issue in post-water treatment. Ferric dyeing sludge mainly stems from the purification procedure of textile industry effluent. This work aimed to reduce, detoxify and reclaim this waste by pyrolyzing it into magnetic biochar (MBC), thereby facilitating the depollution of hexavalent chromium (Cr(VI)) from water. The influence of temperature on the basic property and removal performance of biochar was studied. SEM, N2 adsorption–desorption, FTIR, XRD and VSM were employed to analyze the character of MBC. Results indicated that the MBC had a high specific surface area of 181.09 m2/g as well as good magnetism, and showed satisfactory removal performance for Cr(VI) under acidic condition. The removal behavior was suitably described by pseudo-second-order, Elovich and Temkin models, hinting its chemisorption-based feature. Mechanistic study demonstrated that adsorption and reduction all contributed to the removal process. Furthermore, the MBC possessed good anti-interference ability and reusability. The cost–benefit and carbon footprint analyses suggested the good economic feasibility and environmental friendliness of MBC as an adsorbent. This work promotes the sustainable management of ferric dyeing sludge while simultaneously aiding in water remediation.