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<p>Gold scarcity necessitates efficient recovery from secondary sources including copper smelting wastewater. Simultaneously, agricultural waste disposal remains an environmental challenge. This study synthesized a novel adsorbent—Gai Xing rapeseed Straw (GXS), from waste rapeseed straw through sulfonation and trialkylamine (N235) functionalization. GXS exhibited exceptional Au(III) adsorption capacity (419.5&#xa0;mg∙g<sup>−1</sup> per Langmuir model) and reached equilibrium within 10&#xa0;min. The process was spontaneous and endothermic. Dynamic adsorption tests using real high-acidity polymetallic copper smelting wastewater showed excellent fit to the Thomas model (R<sup>2</sup> &gt; 0.99), with high selectivity for gold over competing metals (As, Bi, Pb, Sb, Se, Te, Cu, adsorption &lt; 6%). This “waste-treats-waste” approach provides an economical and ecofriendly strategy for gold recovery, supporting sustainable resource utilization and circular economy principles.</p> Graphical Abstract <p></p>

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Sustainable Recovery of Gold from Copper Smelting Waste Using Tertiary Amine-Sulfonic Acid Functionalized Rape Straw: Adsorption Performance and Mechanism

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Jielin Liang,
  • Chunfa Liao,
  • Fupeng Liu,
  • Yanliang Zeng,
  • Yunjun Liao,
  • Tongshun Chen,
  • Yukun Pan

摘要

Gold scarcity necessitates efficient recovery from secondary sources including copper smelting wastewater. Simultaneously, agricultural waste disposal remains an environmental challenge. This study synthesized a novel adsorbent—Gai Xing rapeseed Straw (GXS), from waste rapeseed straw through sulfonation and trialkylamine (N235) functionalization. GXS exhibited exceptional Au(III) adsorption capacity (419.5 mg∙g−1 per Langmuir model) and reached equilibrium within 10 min. The process was spontaneous and endothermic. Dynamic adsorption tests using real high-acidity polymetallic copper smelting wastewater showed excellent fit to the Thomas model (R2 > 0.99), with high selectivity for gold over competing metals (As, Bi, Pb, Sb, Se, Te, Cu, adsorption < 6%). This “waste-treats-waste” approach provides an economical and ecofriendly strategy for gold recovery, supporting sustainable resource utilization and circular economy principles.

Graphical Abstract