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<p>To address the dual problems of waste disposal and aquatic phosphorus (P) pollution, this study prepared Titanium gypsum-Cow dung-Attapulgite tailing composite biochar (TCA) via co-pyrolysis, and modified it with NaOH to obtain Titanium gypsum—Cow dung—Attapulgite tailing—NaOH composite biochar (TCAn), systematically investigating its P adsorption performance and mechanism. Orthogonal experiment optimized TCA’s preparation conditions (mass ratio 2:2.5:1.5, 600℃) with an adsorption capacity of 26.79 mg/g, and all three preparation factors had significant effects. TCAn treated with 4 mol/L NaOH for 2 h showed an adsorption capacity of 30.94 mg/g, with heavy metal content far below national standards. Multi-characterization (SEM, BET, XRD and FTIR) revealed NaOH modification endowed TCAn with a porous structure and abundant functional groups (-OH, -COOH), and chemical adsorption was dominated by exchange, electrostatic and precipitation reactions. TCAn’s optimal adsorption conditions were 1 g/L dosage and pH = 9, and its adsorption fitted the pseudo-second-order and Langmuir models, presenting a spontaneous endothermic process. Practical tests showed TCAn’s maximum P adsorption capacity reached 55.82 mg/g, with over 85% adsorption rate in actual water, and it also had nitrogen(N) adsorption capacity. This study realizes waste resource utilization, providing an economical technical approach for water eutrophication control.</p> Graphical Abstract <p></p>

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Co-Pyrolysis of Titanium Gypsum and Cow Dung to Prepare Modified Biochar for Phosphorus Adsorption in Water

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Dongyi Li,
  • He Li,
  • Zhigang Liu,
  • Kexin Xu,
  • Pengfei Wu,
  • Aiguo Sha,
  • Fan Li

摘要

To address the dual problems of waste disposal and aquatic phosphorus (P) pollution, this study prepared Titanium gypsum-Cow dung-Attapulgite tailing composite biochar (TCA) via co-pyrolysis, and modified it with NaOH to obtain Titanium gypsum—Cow dung—Attapulgite tailing—NaOH composite biochar (TCAn), systematically investigating its P adsorption performance and mechanism. Orthogonal experiment optimized TCA’s preparation conditions (mass ratio 2:2.5:1.5, 600℃) with an adsorption capacity of 26.79 mg/g, and all three preparation factors had significant effects. TCAn treated with 4 mol/L NaOH for 2 h showed an adsorption capacity of 30.94 mg/g, with heavy metal content far below national standards. Multi-characterization (SEM, BET, XRD and FTIR) revealed NaOH modification endowed TCAn with a porous structure and abundant functional groups (-OH, -COOH), and chemical adsorption was dominated by exchange, electrostatic and precipitation reactions. TCAn’s optimal adsorption conditions were 1 g/L dosage and pH = 9, and its adsorption fitted the pseudo-second-order and Langmuir models, presenting a spontaneous endothermic process. Practical tests showed TCAn’s maximum P adsorption capacity reached 55.82 mg/g, with over 85% adsorption rate in actual water, and it also had nitrogen(N) adsorption capacity. This study realizes waste resource utilization, providing an economical technical approach for water eutrophication control.

Graphical Abstract