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<p>Cyanide is a toxic pollutant and widely exists in the wastewater of gold smelters. With highly concentrated sulphate and thiocyanate, attaining selective removal of cyanide is an important task. In this paper, we prepared a zinc-based magnetic Layered Double Oxide (LDO) adsorbent for cyanide removal, named ZnAl-LDO/CoFe<sub>2</sub>O<sub>4</sub>. The adsorption product was subjected to pyrolysis to achieve complete removal of cyanide and regeneration of the adsorbent. With ferrocyanide as adsorbate, the maximum adsorption capacity of ZnAl-LDO/CoFe<sub>2</sub>O<sub>4</sub> for total cyanide was 691.9 mg/g. Three kinds of cyanide-containing wastewater from a gold smelter were treated respectively, and the total cyanide concentration in the wastewater reached the emission standard (&lt; 0.5&#xa0;mg/L). The mechanism of ferrocyanide adsorption were surface complexation and the generation of Zn<sub>2</sub>Fe(CN)<sub>6</sub>·3H<sub>2</sub>O. The pyrolysis of the adsorption products allows the recovery of Zn in the form of Zn (g). The unreacted ZnAl-LDO in the product retains its original morphology and has a superior adsorption performance. Under optimal conditions, the adsorption capacity of the pyrolysis product was 223.6 mg/g.</p>

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Selective Adsorption of Cyanide From Highly Concentrated Sulphate and Thiocyanate Wastewater

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Xiaoge Wang,
  • Binchuan Li,
  • Daxue Fu,
  • Yongfeng Chang,
  • Shuang Cui,
  • Kuiren Liu,
  • Xiaocai He,
  • Jianshe Chen,
  • Qing Han

摘要

Cyanide is a toxic pollutant and widely exists in the wastewater of gold smelters. With highly concentrated sulphate and thiocyanate, attaining selective removal of cyanide is an important task. In this paper, we prepared a zinc-based magnetic Layered Double Oxide (LDO) adsorbent for cyanide removal, named ZnAl-LDO/CoFe2O4. The adsorption product was subjected to pyrolysis to achieve complete removal of cyanide and regeneration of the adsorbent. With ferrocyanide as adsorbate, the maximum adsorption capacity of ZnAl-LDO/CoFe2O4 for total cyanide was 691.9 mg/g. Three kinds of cyanide-containing wastewater from a gold smelter were treated respectively, and the total cyanide concentration in the wastewater reached the emission standard (< 0.5 mg/L). The mechanism of ferrocyanide adsorption were surface complexation and the generation of Zn2Fe(CN)6·3H2O. The pyrolysis of the adsorption products allows the recovery of Zn in the form of Zn (g). The unreacted ZnAl-LDO in the product retains its original morphology and has a superior adsorption performance. Under optimal conditions, the adsorption capacity of the pyrolysis product was 223.6 mg/g.