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Cr(VI) retention and transport through Fe(Ⅲ)-coated natural zeolite

机译:Cr(VI)的保留和通过Fe(Ⅲ)涂层天然沸石的迁移

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摘要

Cr(VI) is a group A chemical based on the weight of evidence of carcinogenicity. Its transport and retention in soils and groundwater have been studied extensively. Zeolite is a major component in deposits originated from volcanic ash and tuff after alteration. In this study, zeolite aggregates with the particle size of 1.4-2.4 mm were preloaded with Fe(Ⅲ). The influence of present Fe(Ⅲ) on Cr(Ⅵ) retention by and transport through zeolite was studied under batch and column experiments. The added Fe(Ⅲ) resulted in an enhanced Cr(Ⅵ) retention by the zeolite with a capacity of 82 mg/kg. The Cr(Ⅵ) adsorption on Fe(Ⅲ)-zeolite followed a pseudo-second order kinetically and the Freundlich adsorption isotherm ther-modynamically. Fitting the column experimental data to HYDRUS-1D resulted in a retardation factor of 3 in comparison to 5 calculated from batch tests at an initial Cr(Ⅵ) concentration of 3 mg/L The results from this study showed that enhanced adsorption and retention of Cr(Ⅵ) may happen in soils derived from volcanic ash and tuff that contains significant amounts of zeolite with extensive Fe(Ⅲ) coating.
机译:Cr(VI)是基于致癌证据的重量的A组化学物质。其在土壤和地下水中的运输和保留已被广泛研究。沸石是蚀变后源自火山灰和凝灰岩的沉积物中的主要成分。在这项研究中,将粒度为1.4-2.4 mm的沸石骨料预装了Fe(Ⅲ)。通过分批和柱实验研究了目前的Fe(Ⅲ)对Cr(Ⅵ)的吸附和通过沸石的迁移的影响。 Fe(Ⅲ)的加入使沸石对Cr(Ⅵ)的保留增加,容量为82mg / kg。 Cr(Ⅵ)在Fe(Ⅲ)-沸石上的吸附动力学遵循伪二级动力学规律,Freundlich吸附等温线热动力学规律。将HYDRUS-1D色谱柱实验数据拟合后,在初始Cr(Ⅵ)浓度为3 mg / L时,批处理测试得出的阻滞系数为3,而批处理试验得出的阻滞系数为3。 (Ⅵ)可能发生在火山灰和凝灰岩衍生的土壤中,该土壤中含有大量的具有广泛Fe(Ⅲ)涂层的沸石。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.118-123|共6页
  • 作者单位

    School of Materials Science and Technology. China University of Geosciences, Beijing 100083, China;

    School of Materials Science and Technology. China University of Geosciences, Beijing 100083, China,Ceosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144, USA,Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan,Ceosciences Department, University of Wisconsin - Parkside, 900 Wood Road, Box 2000, Kenosha, WI 53144-2000, USA;

    School of Materials Science and Technology. China University of Geosciences, Beijing 100083, China;

    Ceosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144, USA;

    Ceosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144, USA;

    Ceosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144, USA;

    Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan;

  • 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

    adsorption; chromate; ferric iron; retention; transport; zeolite;

    机译:吸附铬酸盐;铁保留;运输;沸石;

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