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首页> 外文期刊>Environmental Science & Technology >Synergistic Effects of Reduced Nontronite and Organic Ligands on Cr(Ⅵ) Reduction
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Synergistic Effects of Reduced Nontronite and Organic Ligands on Cr(Ⅵ) Reduction

机译：还原的绿脱石和有机配体对Cr（Ⅵ）还原的协同作用

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摘要

Widespread iron-bearing clay minerals are potential materials that can reduce and immobilize Cr(VI) as insoluble Cr2O3/Cr(OH)(3). The kinetics of this process is controlled by various environmental factors, yet the effects of such factors on Cr(VI) transformation by iron-bearing clays are poorly understood. Herein, we report the synergistic effects of reduced nontronite (rNAu-2) and environmentally prevalent organic ligands on Cr(VI) reduction under nearneutral pH conditions. The presence of ligands belonging to alpha-hydroxyl or carbonyl carboxylates, such as tartrate, malate, lactate, pyruvate, and mandelate, significantly promoted the rate and extent of Cr(VI) reduction by rNAu-2, likely because of the formation of Cr(V)-ligand complexes and resulting electron transfer from the ligand to Cr(V). In contrast, ligands containing carboxyl groups only, such as succinate and propionate, had a slightly inhibitory or no effect, likely because of their weak complexing ability with Cr(V) and lack of electron transfer from the ligand to Cr(V). In addition, alpha-hydroxyl carboxylates are probably more easily oxidized by Cr(V)/Cr(IV) than carboxylates. Soluble Cr(III)-organic complexes were the dominant products of Cr(VI) reduction in the presence of tartrate and malate. This study highlights the importance of organic ligands in the biogeochemical cycling of chromium and has significant implications for chromium remediation in contaminated environments.
机译：广泛的含铁粘土矿物是可以还原和固定不溶性Cr2O3 / Cr（OH）（3）的Cr（VI）的潜在材料。此过程的动力学受各种环境因素控制，但对于含铁粘土对Cr（VI）转化的影响却知之甚少。在这里，我们报告了还原的绿脱石（rNAu-2）和环境中普遍存在的有机配体在中性pH条件下对Cr（VI）还原的协同效应。属于α-羟基或羰基羧酸盐的配体（例如酒石酸盐，苹果酸盐，乳酸盐，丙酮酸盐和扁桃酸盐）的存在显着促进了rNAu-2还原Cr（VI）的速率和程度，这可能是由于Cr的形成（V）-配体络合物，以及由此产生的电子从配体转移到Cr（V）。相反，仅含羧基的配体（例如琥珀酸酯和丙酸酯）具有轻微的抑制作用或没有抑制作用，这可能是因为它们与Cr（V）的络合能力较弱，并且缺乏从配体到Cr（V）的电子转移。此外，α-羟基羧酸盐可能比羧酸盐更容易被Cr（V）/ Cr（IV）氧化。在酒石酸盐和苹果酸存在下，可溶性Cr（III）-有机配合物是Cr（VI）还原的主要产物。这项研究突出了有机配体在铬的生物地球化学循环中的重要性，并对污染环境中的铬修复具有重要意义。

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  • 来源
    《Environmental Science & Technology》 |2019年第23期|13732-13741|共10页
  • 作者

    Liu Xiaolei; Dong Hailiang; Zeng Qiang; Yang Xuewei; Zhang Donglei;

  • 作者单位

    China Univ Geosci Sch Water Resources & Environm Beijing 100083 Peoples R China|China Univ Geosci State Key Lab Biogeol & Environm Geol Beijing 100083 Peoples R China;

    China Univ Geosci Sch Water Resources & Environm Beijing 100083 Peoples R China|China Univ Geosci State Key Lab Biogeol & Environm Geol Beijing 100083 Peoples R China|China Univ Geosci Sch Earth Sci & Resources Beijing 100083 Peoples R China;

    China Univ Geosci State Key Lab Biogeol & Environm Geol Beijing 100083 Peoples R China|China Univ Geosci Sch Earth Sci & Resources Beijing 100083 Peoples R China;

    China Univ Geosci State Key Lab Biogeol & Environm Geol Beijing 100083 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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