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ZnO负载活性炭材料对亚铁氰离子的去除性能研究

  • 作者:
  • 王晓歌|吴冰|郭子轩|刘亚芳|李斌川|孟伟粉|韩庆

  • 作者单位:
  • (1. 东北大学冶金学院;2. 三门峡职业技术学院;3. 三门峡市有色金属技术发展中心)
  • 基金项目:

  • 三门峡市2022 年科技攻关项目(2022002001)
  • 详细信息:

  • 作者简介:
  • 王晓歌(1996—),女,博士研究生,从事含氰废水资源化处置研究工作;E⁃mail:wxg18437955208@163. com
  • 通讯作者:
  • 韩庆(1975—),男,教授,从事冶金环保研究工作;E⁃mail:hanq@smm. neu. edu. cn
  • PDF下载

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)
  • 摘要
  • 在线预览
  • 参考文献

摘要:

亚铁氰离子([Fe(CN)6]4-)是一种稳定的污染物,长期存在于黄金生产产生的含氰废水中,阻碍了含氰废水的有效治理和达标排放。研究制备了氧化锌(ZnO)负载活性炭材料,探究其对[Fe(CN)6]4-的去除性能、吸附机理、吸附产物的热解再生等。结果表明:吸附剂制备的优化条件为焙烧温度550 ℃、焙烧时间2 h、ZnO负载量10 %;该吸附剂可实现亚铁氰离子的完全吸附;吸附机理为活性炭表面的ZnO与[Fe(CN)6]4-反应生成Zn2[Fe(CN)6]。吸附产物热解过程中,Zn2[Fe(CN)6]热分解生成Zn、Fe、C和N2,未反应的ZnO活性位点重新暴露出来,从而实现吸附剂的再生;在氩气气氛、热解温度为350 ℃、热解时间为2 h条件下,再生吸附剂的吸附效果最佳。  

关键词:

亚铁氰离子;氧化锌;活性炭;吸附;再生;含氰废水

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