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铁碳材料还原NO络合吸收体系中Fe(Ⅲ)EDTA的性能

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张颖, 黄妍, 李元元, 唐南, 张俊丰, 杨柳春. 铁碳材料还原NO络合吸收体系中Fe(Ⅲ)EDTA的性能[J]. 环境工程学报, 2017, 11(11): 5943-5948. doi: 10.12030/j.cjee.201701099
引用本文: 张颖, 黄妍, 李元元, 唐南, 张俊丰, 杨柳春. 铁碳材料还原NO络合吸收体系中Fe(Ⅲ)EDTA的性能[J]. 环境工程学报, 2017, 11(11): 5943-5948. doi: 10.12030/j.cjee.201701099
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ZHANG Ying, HUANG Yan, LI Yuanyuan, TANG Nan, ZHANG Junfeng, YANG Liuchun. Performance of Fe(Ⅲ)EDTA reduction with Fe/AC in NO complex absorption system[J]. Chinese Journal of Environmental Engineering, 2017, 11(11): 5943-5948. doi: 10.12030/j.cjee.201701099
Citation: ZHANG Ying, HUANG Yan, LI Yuanyuan, TANG Nan, ZHANG Junfeng, YANG Liuchun. Performance of Fe(Ⅲ)EDTA reduction with Fe/AC in NO complex absorption system[J]. Chinese Journal of Environmental Engineering, 2017, 11(11): 5943-5948. doi: 10.12030/j.cjee.201701099
shu

铁碳材料还原NO络合吸收体系中Fe(Ⅲ)EDTA的性能

  • 1.

    湘潭大学环境与资源学院, 湘潭 411105

  • 基金项目:

    湖南省教育厅高校创新平台开放基金项目（14K094）

  • 中图分类号: X511

Performance of Fe(Ⅲ)EDTA reduction with Fe/AC in NO complex absorption system

  • 1.

    College of Environment and Resources, Xiangtan University, Xiangtan 411105, China

  • Fund Project:

  • 摘要: 在湿法烟气脱硝中，Fe（Ⅱ）EDTA是一种常用的螯合剂，对NO有良好的络合吸收能力，但是Fe（Ⅱ）EDTA容易被O2氧化成对NO无络合能力的Fe（Ⅲ）EDTA。因此，选择合适的还原剂实现Fe（Ⅲ）EDTA的高效还原是络合脱硝的关键技术之一。比较了铁碳（Fe/AC）和铁粉（Fe）在不同搅拌速度下对Fe（Ⅲ）EDTA的还原，系统探讨了铁碳质量比、O2浓度、铁碳中Fe与Fe（Ⅲ）EDTA的摩尔比、pH值和Fe（Ⅲ）EDTA初始浓度对铁碳还原Fe（Ⅲ）EDTA的影响，考察了Fe/AC投加前后NO吸收效率的变化，同时通过BET、XRD表征技术对铁碳材料进行了分析。结果表明：Fe/AC能很好地再生Fe（Ⅱ）EDTA，从而提高NO吸收效率。提高搅拌速度、铁碳中Fe与Fe（Ⅲ）EDTA的摩尔比、Fe（Ⅲ）EDTA初始浓度，Fe（Ⅲ）EDTA的还原速率会相应增大；O2浓度及pH增大会降低Fe（Ⅲ）EDTA的还原速率。表征结果表明，铁碳表面形成的氢氧化物为γ-FeOOH。
    Abstract: In wet flue gas denitration, Fe (Ⅱ) EDTA is a common chelating agent with good complexing ability to NO, but it is easily oxidized to Fe (Ⅲ) EDTA which have no binding capacity to NO. Thus it's a key technology to select proper reducing agents to regenerate Fe (Ⅱ) EDTA. Batch experiments were conduct to compare the Fe (Ⅲ) EDTA reduction in Fe/AC and Fe system at different stirring speed. The effects of different parameters on Fe (Ⅲ) EDTA reduction were investigated such as the mass ratio of Fe to AC, O2 concentration, the molar ratio of Fe to Fe (Ⅲ) EDTA, the pH value and the initial concentration of Fe (Ⅲ) EDTA. And the NO removal efficiency was also investigated without and with Fe/AC. Furthermore, Fe/AC material was analyzed by BET, XRD. The experimental results showed NO removal efficiency was improved with regeneration of Fe (Ⅱ)EDTA by Fe/AC. The reduction rate of Fe (Ⅲ) EDTA increases with the enhancement of stirring speed, the molar ratio of Fe in Fe/AC to Fe (Ⅲ) EDTA and the initial concentration of Fe (Ⅲ) EDTA. However, the reduction rate of Fe (Ⅲ) EDTA obviously decreased when the concentration of O2 and the pH value increased. The characterization results demonstrated the surface of Fe/AC was covered with γ-FeOOH.
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  • 收稿日期:  2017-04-17
  • 刊出日期:  2017-11-15

铁碳材料还原NO络合吸收体系中Fe(Ⅲ)EDTA的性能

  • 1. 湘潭大学环境与资源学院, 湘潭 411105
  • 收稿日期:  2017-04-17
基金项目:

湖南省教育厅高校创新平台开放基金项目（14K094）

摘要: 在湿法烟气脱硝中，Fe（Ⅱ）EDTA是一种常用的螯合剂，对NO有良好的络合吸收能力，但是Fe（Ⅱ）EDTA容易被O2氧化成对NO无络合能力的Fe（Ⅲ）EDTA。因此，选择合适的还原剂实现Fe（Ⅲ）EDTA的高效还原是络合脱硝的关键技术之一。比较了铁碳（Fe/AC）和铁粉（Fe）在不同搅拌速度下对Fe（Ⅲ）EDTA的还原，系统探讨了铁碳质量比、O2浓度、铁碳中Fe与Fe（Ⅲ）EDTA的摩尔比、pH值和Fe（Ⅲ）EDTA初始浓度对铁碳还原Fe（Ⅲ）EDTA的影响，考察了Fe/AC投加前后NO吸收效率的变化，同时通过BET、XRD表征技术对铁碳材料进行了分析。结果表明：Fe/AC能很好地再生Fe（Ⅱ）EDTA，从而提高NO吸收效率。提高搅拌速度、铁碳中Fe与Fe（Ⅲ）EDTA的摩尔比、Fe（Ⅲ）EDTA初始浓度，Fe（Ⅲ）EDTA的还原速率会相应增大；O2浓度及pH增大会降低Fe（Ⅲ）EDTA的还原速率。表征结果表明，铁碳表面形成的氢氧化物为γ-FeOOH。

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