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首页> 外文期刊>Environmental Science & Technology >Disilicate-Assisted Iron Electrolysis for Sequential Fenton-Oxidation and Coagulation of Aqueous Contaminants
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Disilicate-Assisted Iron Electrolysis for Sequential Fenton-Oxidation and Coagulation of Aqueous Contaminants

机译：二硅酸盐辅助的铁电解法连续进行芬顿氧化和水污染物的混凝

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摘要

Sodium disilicate (SD), an inorganic and environmentally friendly ligand, is introduced into the conventional iron electrolysis system to achieve an oxidizing Fenton process to degrade organic pollutants. Electrolytic ferrous ions, which are complexed by the disilicate ions, can chemically reduce dioxygen molecules via consecutive reduction steps, producing H_2O_2 for the Fenton-oxidation of organics. At the near-neutral pH (from 6 to 8), the disilicate-Fe(II) complexes possess strong reducing capabilities; therefore, a near-neutral pH rather than an acid condition is preferable for the disilicate-assisted iron electrolysis (DAIE) process. Following the DAIE process, the different complexing capacities of disilicate for ferrous/ferric ions and calcium ions can be used to break the disilicate-iron complexes. The addition of CaO or CaCl_2 can precipitate ferrous/ferric ions, disilicates and possibly heavy metals in the wastewater. Compared to previously reported organic and phosphorus ligands, SD is a low-cost inorganic agent that does not lead to secondary pollution, and would not compete with the target organic pollutants for •OH; therefore, it would greatly expand the application fields of the O_2 activation process. The combination of DAIE and CaO treatments is envisioned to be a versatile and affordable method for treating wastewater with complicated pollutants (e.g., mixtures of biorefractory organics and heavy metals).
机译：将无机和环保的配体二硅酸钠（SD）引入常规的铁电解系统中，以实现氧化Fenton工艺以降解有机污染物。与二硅酸根离子络合的电解亚铁离子可通过连续的还原步骤化学还原双氧分子，从而产生用于有机物的芬顿氧化的H_2O_2。在接近中性的pH（6至8）下，二硅酸盐-Fe（II）络合物具有很强的还原能力。因此，对于二硅酸盐辅助的铁电解（DAIE）工艺，优选接近中性的pH值而不是酸性条件。在DAIE方法之后，二硅酸盐对亚铁/铁离子和钙离子的不同络合能力可用于破坏二硅酸盐-铁络合物。 CaO或CaCl_2的添加会在废水中沉淀亚铁/铁离子，二硅酸盐和可能的重金属。与以前报道的有机和磷配体相比，SD是一种低成本的无机试剂，不会导致二次污染，并且不会与目标有机污染物竞争•OH。因此，它将大大扩展O_2激活过程的应用领域。设想将DAIE和CaO处理相结合是一种通用且可负担的方法，用于处理具有复杂污染物（例如，生物难熔有机物和重金属的混合物）的废水。

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  • 来源
    《Environmental Science & Technology》 |2017年第14期|8077-8084|共8页
  • 作者

    Cui Jiaxin; Wang Xu; Zhang Jing; Qiu Xiaoyu; Wang Dihua; Zhao Ying; Xi Beidou; Alshawabkeh Akram N.; Mao Xuhui;

  • 作者单位

    School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan, China;

    School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan, China;

    School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan, China;

    School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan, China;

    School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan, China;

    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, China;

    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, China;

    Civil and Environmental Engineering Department, Northeastern University, Boston, MA, United States;

    School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan, 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);
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