Organic Matter Counteracts the Enhancement of Cr(III) Extractability during the Fe(ll)-Catalyzed Ferrihydrite Transformation: A Nanoscale- and Molecular-Level Investigation

Xing Xia; Jin Liu; Lin Jin

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Organic Matter Counteracts the Enhancement of Cr(III) Extractability during the Fe(ll)-Catalyzed Ferrihydrite Transformation: A Nanoscale- and Molecular-Level Investigation

机译：Organic Matter Counteracts the Enhancement of Cr(III) Extractability during the Fe(ll)-Catalyzed Ferrihydrite Transformation: A Nanoscale- and Molecular-Level Investigation

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Phase transformation of ferrihydrite to more stable Fe (oxyhydr)oxides, catalyzed by iron(ll) [Fe(II)], significantly influences the mobility of heavy metals [e.g., chromium (Cr)] associated with ferrihydrite. However, the impact of organic matter (OM) on the behavior of Cr(III) in the Fe(ll)-catalyzed transformation of ferrihydrite and the underlying mechanisms are unclear. Here, the Fe(ll)-catalyzed transformation of the coprecipitates of Fe(III), Cr(III), or rice straw-derived OM was studied at the nanoscale and molecular levels using Fe and Cr K-edge X-ray absorption spectroscopy and spherical aberration corrected scanning transmission electron microscopy (Cs-STEM). Batch extraction results suggested that the OM counteracted the enhancement of Cr(III) extractability during the Fe(ll)-catalyzed transformation. Cs-STEM and XAS analysis suggested that Cr(III) could be incorporated into the goethite formed by Fe(ll)-catalyzed ferrihydrite transformation, which, however, was inhibited by the OM. Furthermore, Cs-STEM analysis also provided direct nanoscale level evidence that residual ferrihydrite could re-immobilize the released Cr(IIl) during the Fe(ll)-catalyzed transformation process. These results highlighted that the decreased extractability of Cr(III) mainly resulted from the inhibition of OM on the Fe(ll)-catalyzed transformation of ferrihydrite to secondary Fe (oxyhydr)oxides, which facilitates insightful understanding and prediction of the geochemical cycling of Cr in soils with active redox dynamics.

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来源
《Environmental Science & Technology: ES&T》 |2023年第36期|13496-13505|共10页
作者
Xing Xia; Jin Liu; Lin Jin;
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作者单位

College of Resources and Environment, Key Laboratory of Agri-food Safety of Anhui Province, Anhui Agricultural University, Hefei 230036, PR China) Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;

College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China;

Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;

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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
正文语种英语
中图分类环境科学、安全科学;
关键词
iron (oxyhydr)oxides; organic matter; chromium; coprecipitation; XANES;

Organic Matter Counteracts the Enhancement of Cr(III) Extractability during the Fe(ll)-Catalyzed Ferrihydrite Transformation: A Nanoscale- and Molecular-Level Investigation

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