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首页> 外文期刊>Journal of Hazardous Materials >Removal of organic dye by biomass-based iron carbide composite with an improved stability and efficiency
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Removal of organic dye by biomass-based iron carbide composite with an improved stability and efficiency

机译：生物质基碳化铁复合材料去除有机染料的稳定性和效率得到提高

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摘要

The efficiency of zero-valent iron (Fe-0)for the degradation of contaminants in water or soil can be highly reduced by side reactions with oxygen or water. This work was conducted to test whether this drawback can be effectively suppressed by the carbonation of Fe-0 with pyrolyzed biomass, which forms a Fe3C composite. The composite Fe3C was characterized and its reactivity and stability were assessed in batch tests with methyl orange (MO) as a model pollutant. The results indicated that the removal rate of MO on Fe3C composite was higher than that of Fe-0 (7.587 mg/(g.min) vs. 4.306 mg/(g.min)) at pH 4, where the degradation mechanism was confirmed by high-performance liquid chromatography-mass spectrometry. More importantly, the produced iron oxide in the Fe3C composite was highly suppressed. Regeneration studies showed that after three times of cycling, the removal efficiency of MO on Fe3C composite was kept to 99.42%, but Fe-0 almost lost its reactivity. In situ chemical reduction of a colorimetric redox probe (indigo-5, 5'-disulfonate, I2S) quantitatively demonstrated that Fe3C composite has the reduction kinetics of I2S obviously slower than Fe-0, indicating that Fe3C composite improved the stability of incorporated Fe-0 to resist the side oxidation.
机译：零价铁（Fe-0）降解水或土壤中污染物的效率可通过与氧气或水发生副反应而大大降低。进行这项工作以测试是否可以通过热解生物质形成的Fe3C复合材料将Fe-0碳酸化来有效地抑制这一缺陷。对Fe3C复合材料进行了表征，并在以甲基橙（MO）作为模型污染物的分批测试中评估了其反应性和稳定性。结果表明，在pH 4下，MO对Fe3C复合材料的去除率高于Fe-0（7.587 mg /（g.min）对4.306 mg /（g.min）），这证实了其降解机理。用高效液相色谱-质谱联用更重要的是，Fe3C复合物中产生的氧化铁被高度抑制。再生研究表明，经过3次循环后，MO对Fe3C复合材料的去除效率保持在99.42％，但Fe-0几乎失去了反应活性。比色氧化还原探针（靛蓝5、5'-二磺酸盐，I2S）的原位化学还原定量表明，Fe3C复合材料的I2S还原动力学明显慢于Fe-0，表明Fe3C复合材料提高了掺入的Fe-C的稳定性。 0抵抗侧面氧化。

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  • 来源
    《Journal of Hazardous Materials》 |2019年第5期|621-631|共11页
  • 作者

    Zhao Nan; Chang Feiran; Hao Boyuan; Yu Lian; Morel Jean Louis; Zhang Jing;

  • 作者单位

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Environm Nanotechnol & Hlth Effect, Beijing 100085, Peoples R China|Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou 510275, Guangdong, Peoples R China;

    Peking Univ, Coll Life Sci, Beijing 100871, Peoples R China;

    China Univ Min & Technol, Sch Chem & Environm Engn, Beijing 100083, Peoples R China;

    Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China;

    Univ Lorraine, Lab Sols & Environm, INRA, 2 Ave Foret Haye BP 20163, F-54505 Vandoeuvre Les Nancy, France;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Environm Nanotechnol & Hlth Effect, Beijing 100085, Peoples R China|Univ Chinese Acad Sci, Natl Engn Lab VOCs Pollut Control Mat & Technol, Beijing 101408, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fe3C composite; Fe-0; Degradation; Stability; Methyl orange;

    机译：Fe3C复合材料;Fe-0;降解;稳定性;甲基橙;

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