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首页> 外文期刊>Environmental Science & Technology >Novel Cu(Ⅱ)-EDTA Decomplexation by Discharge Plasma Oxidation and Coupled Cu Removal by Alkaline Precipitation: Underneath Mechanisms
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Novel Cu(Ⅱ)-EDTA Decomplexation by Discharge Plasma Oxidation and Coupled Cu Removal by Alkaline Precipitation: Underneath Mechanisms

机译：放电等离子体氧化新的Cu（Ⅱ）-EDTA分解和碱性沉淀耦合除铜的机理研究

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摘要

Strong complexation between heavy metals and organic complexing agents makes the heavy metals difficult to be removed by classical chemical precipitation. In this study, a novel decomplexation method was developed using discharge plasma oxidation, which was followed by alkaline precipitation to treat water containing heavy metal-organic complex, that is, Cu-ethylenediaminetetraacetic acid (Cu-EDTA). The decomplexation efficiency of Cu complex reached up to nearly 100% after 60 min's oxidation by discharge plasma, which was accompanied by 82.1% of total organic carbon removal and energy efficiency of 0.62 g kWh(-1). Presence of free Cu2+ favored Cu-EDTA decomplexation, whereas the presence of excessive EDTA depressed this process. Cu-EDTA decomplexation was mainly driven by the produced O-1(2), O-2(center dot-), O-3, and center dot OH by discharge plasma. Cu-EDTA decomplexation process was characterized by UV-vis, ATR-FTIR, total organic carbon, and three-dimensional fluorescence diagnosis. The main intermediates including Cu-EDDA, Cu-IDA, Cu-NTA, small organic acids, NH4+, and NO3- were identified, accompanied by Cu2+ releasing. The followed precipitation process removed 78.1% of Cu2+, and Cu-associated precipitates included CuCO3, Cu2CO3(OH)(2), CuO, and Cu(OH)(2). A possible pathway of Cu complex decomplexation and Cu2+ removal in such a system was proposed.
机译：重金属和有机络合剂之间的强络合使得重金属很难通过经典的化学沉淀法去除。在这项研究中，开发了一种使用放电等离子体氧化的新的复合方法，然后进行碱性沉淀来处理含有重金属-有机配合物（即铜-乙二胺四乙酸）（Cu-EDTA）的水。放电等离子体氧化60分钟后，Cu络合物的分解效率达到近100％，同时有机物去除总有机碳的82.1％和能效0.62 g kWh（-1）。游离Cu 2+的存在有利于Cu-EDTA的分解，而过量EDTA的存在抑制了该过程。 Cu-EDTA分解主要由放电等离子体产生的O-1（2），O-2（中心点），O-3和中心点OH驱动。通过紫外可见光谱，ATR-FTIR，总有机碳和三维荧光诊断来表征Cu-EDTA的分解过程。确定了主要中间体，包括Cu-EDDA，Cu-IDA，Cu-NTA，小有机酸，NH4 +和NO3-，并伴有Cu2 +释放。随后的沉淀过程去除了78.1％的Cu2 +，与Cu相关的沉淀包括CuCO3，Cu2CO3（OH）（2），CuO和Cu（OH）（2）。提出了在这种系统中铜络合物分解和去除铜离子的可能途径。

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  • 来源
    《Environmental Science & Technology》 |2018年第14期|7884-7891|共8页
  • 作者

    Wang Tiecheng; Cao Yang; Qu Guangzhou; Sun Qiuhong; Xia Tianjiao; Guo Xuetao; Jia Hanzhong; Zhu Lingyan;

  • 作者单位

    Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China;

    Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China;

    Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China;

    Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China;

    Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China;

    Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China;

    Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China;

    Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, 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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