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Study on the removal efficiency of ZnO‑loaded activated carbon for ferrocyanide ions

  • English Author:
  • Wang Xiaoge¹, Wu Bing², Guo Zixuan¹, Liu Yafang³, Li Binchuan¹, Meng Weifen³, Han Qing¹

  • Unit:
  • (1. School of Metallurgy, Northeastern University; 2. Sanmenxia Polytechnic; 3. Sanmenxia Nonferrous Metal Technology Development Center)
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Abstract:

Ferrocyanide ions ((Fe(CN)6), a stable pollutant in cyanide-containing wastewater from gold production. hinder effective wastewater treatment and compliant discharge. This study developed zinc oxide(Zn0)-loaded activated carbon materials to investigate their removal efficiency, ads sorption mechanisms, and pyrolytic regeneration for adsorption products of [ Fe(CN)6]+-. Results show that optimal preparation conditions include a roasting temperature of 550 °C. roasting time of 2 h, and ZnO loading of 10 %. Complete adsorption can be achieved with the adsorbent. The adsorption mechanism involves the reaction of ZnO on the activated carbon surface with [ Fe(CN)6*-to form Zn2[ Fe(CN)6]. During pyrolysis regeneration of adsorption products, Znz[ Fe(CN)6] decomposes into Zn, Fe, C, and N2, while unreacted ZnO active sites are re-exposed, enabling adsorbent regeneration. Regenerated adsorbents exhibit optimal performance when the pyrolysis temperature is 350 °C and the pyrolysis duration is 2 h under argon atmosphere.

Keywords:

ferrocyanide ion; zinc oxide; activated carbon; adsorption; regeneration; cyanide⁃containing wastewater