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首页> 外文期刊>Journal of Hazardous Materials >Behaviors and fate of adsorbed Cr(Ⅵ) during Fe(Ⅱ)-induced transformation of ferrihydrite-humic acid co-precipitates
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Behaviors and fate of adsorbed Cr(Ⅵ) during Fe(Ⅱ)-induced transformation of ferrihydrite-humic acid co-precipitates

机译：Fe（Ⅱ）诱导Ferrihydite - 腐殖酸共沉淀物中吸附Cr（Ⅵ）的行为和命运

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摘要

The mobility of Cr(VI) in the environment is affected by the transformation of ferrihydrite (Fh) and ferrihydrite-humic acid co-precipitates (Fh-HA). However, the impacts of Fe(II)-induced transformation of Fh and Fh-HA on the mobility, speciation and partitioning of associated Cr(VI) remain unclear. In this study, the behaviors of adsorbed Cr(VI) during Fh and Fh-HA aging at 70 degrees C for 9 days (pH(0) = 3.0 and 7.0) in the absence and presence of Fe(II) were studied. Results revealed that the main speciation of Cr(VI) after transformation was non-desorbable Cr and its formation involved the following pathways. Firstly, Fe(II) (0.2 and 2.0 mM) induced the transformation of Fh-HA to hematite and goethite, promoting the structural incorporation of adsorbed Cr into hematite and goethite via complexation. Secondly, under neutral condition (pH(0) = 7.0), the low concentration of Fe(II) (0.2 mM) could not reduce completely Cr(VI) to Cr(III) and thus residual Cr(VI) was incorporated into the Cr(III)-Fe(III) co-precipitates. Thirdly, coprecipitated humic acid not only reduced Cr(VI) to Cr(III) via polysaccharide, but also formed complexes with incorporated Cr through carboxylic groups to sequester Cr. Our results demonstrate that Fe(II)-induced transformation of Fh-HA exerts major influences on associated Cr(VI) speciation and partitioning.
机译：Cr（VI）在环境中的迁移性受到Ferrihydite（FH）和Ferrihydite-蜂酸共析出物（FH-HA）的转化的影响。然而，Fe（II）-诱导的FH和FH-HA转化对相关CR（VI）的迁移率，样品和分区的影响仍然不清楚。在该研究中，研究了在没有和存在Fe（II）的情况下在70℃下（pH（0）= 3.0和7.0）的FH和FH-HA衰老期间吸附Cr（VI）的行为。结果表明，转化后Cr（VI）的主要形态是非解层的Cr，其形成涉及以下途径。首先，Fe（II）（0.2和2.0mm）诱导FH-HA的转化为赤铁矿和可染色体，通过络合促进吸附的Cr的结构掺入和可粘合剂。其次，在中性条件下（pH（0）= 7.0），低浓度的Fe（II）（0.2mm）不能完全减少Cr（vi）至Cr（iii），因此将残留的Cr（VI）纳入其中Cr（iii）-fe（iii）共沉淀。第三，共沉淀的腐殖酸不仅通过多糖还原至Cr（III）至Cr（III），而且还通过掺入羧基的掺入羧基加入Cr的复合物。我们的结果表明，Fe（ii） - 诱导FH-HA的转化对相关的CR（VI）形态和分区产生重大影响。

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  • 来源
    《Journal of Hazardous Materials》 |2020年第15期|122272.1-122272.10|共10页
  • 作者

    Yu Guangda; Fu Fenglian; Ye Chujia; Tang Bing;

  • 作者单位

    Guangdong Univ Technol Guangdong Key Lab Environm Catalysis & Hlth Risk Sch Environm Sci & Engn Guangzhou 510006 Peoples R China;

    Guangdong Univ Technol Guangdong Key Lab Environm Catalysis & Hlth Risk Sch Environm Sci & Engn Guangzhou 510006 Peoples R China;

    Guangdong Univ Technol Guangdong Key Lab Environm Catalysis & Hlth Risk Sch Environm Sci & Engn Guangzhou 510006 Peoples R China;

    Guangdong Univ Technol Guangdong Key Lab Environm Catalysis & Hlth Risk Sch Environm Sci & Engn Guangzhou 510006 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

    Cr(VI); Ferrihydrite-humic acid co-precipitates; Fe(II); Transformation; Immobilization;

    机译：Cr（vi）;Ferrihydrite-腐殖酸共沉淀;Fe（ii）;转型;固定化;

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