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首页> 外文期刊>Environmental Science & Technology >Removal of Chloride Ions from Strongly Acidic Wastewater Using Cu(0)/Cu(Ⅱ): Efficiency Enhancement by UV Irradiation and the Mechanism for Chloride Ions Removal
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Removal of Chloride Ions from Strongly Acidic Wastewater Using Cu(0)/Cu(Ⅱ): Efficiency Enhancement by UV Irradiation and the Mechanism for Chloride Ions Removal

机译：Cu（0）/ Cu（Ⅱ）从强酸性废水中去除氯离子的研究：紫外线辐射提高效率及氯离子去除的机理

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摘要

Strongly acidic wastewater, which is usually generated from nonferrous metal smelting industries, has the ability to be recycled as sulfuric acid. Before this wastewater is recycled, the removal of chloride ions is necessary to improve the quality of the recycled sulfuric acid. At present, the widely used method to remove chloride ions from acidic wastewater in the form of CuCl precipitate has several disadvantages, including low removal efficiency, high temperature, long treatment time, and high dosage of Cu(II). This study proposed an improved new method of removing Cl(-I) using Cu(0)/Cu(II) under UV irradiation, and the mechanism was investigated. The Cl(-I) concentration was lowered to below 50 mg/L at a Cu(II) dosage of 1200 mg/L. Under UV irradiation, ligand-to-metal charge transfer takes place, thereby resulting in the formation of Cl-center dot. Next, CuCI precipitates form through the reaction between Cu(0) and Cl-center dot and produce h(+)/(OH)-O-center dot under UV irradiation, which can oxidize Cl(-I) to Cl-center dot. Simultaneously, Cl-2 gas also forms directly from Cl-center dot. This study offered a theoretical foundation for the application of UV irradiation for the enhanced removal of chloride ions from strongly acidic wastewater.
机译：通常从有色金属冶炼行业产生的强酸性废水具有作为硫酸循环利用的能力。在回收该废水之前，必须去除氯离子以提高回收硫酸的质量。目前，广泛使用的以CuCl沉淀形式从酸性废水中去除氯离子的方法具有以下几个缺点，包括去除效率低，温度高，处理时间长和高剂量的Cu（II）。这项研究提出了一种改进的新方法，在紫外线照射下使用Cu（0）/ Cu（II）去除Cl（-I），并研究了机理。当Cu（II）剂量为1200 mg / L时，Cl（-I）浓度降至50 mg / L以下。在紫外线照射下，发生了配体到金属的电荷转移，从而导致了Cl中心点的形成。接下来，CuCl沉淀物通过Cu（0）与Cl-中心点之间的反应形成，并在UV辐射下产生h（+）/（OH）-O-中心点，这可以将Cl（-I）氧化为Cl--中心点。同时，Cl-2气体也直接从Cl中心点形成。这项研究为应用紫外线辐射增强从强酸性废水中去除氯离子提供了理论基础。

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  • 来源
    《Environmental Science & Technology》 |2019年第1期|383-389|共7页
  • 作者

    Peng Xianjia; Dou Wenyue; Kong Linghao; Hu Xingyun; Wang Xianliang;

  • 作者单位

    Chinese Acad Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China|Chinese Acad Sci, Beijing Key Lab Ind Wastewater Treatment & Resour, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China|Chinese Acad Sci, Beijing Key Lab Ind Wastewater Treatment & Resour, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China|Chinese Acad Sci, Beijing Key Lab Ind Wastewater Treatment & Resour, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China;

    Chinese Acad Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China|Chinese Acad Sci, Beijing Key Lab Ind Wastewater Treatment & Resour, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China;

    Chinese Ctr Dis Control & Prevent, Natl Inst Environm Hlth, Beijing 100021, 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);
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