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首页> 外文期刊>Environmental engineering research >Arsenic Removal from Water Using Various Adsorbents: Magnetic Ion Exchange Resins, Hydrous Ion Oxide Particles, Granular Ferric Hydroxide, Activated Alumina, Sulfur Modified Iron, and Iron Oxide-Coated Microsand
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Arsenic Removal from Water Using Various Adsorbents: Magnetic Ion Exchange Resins, Hydrous Ion Oxide Particles, Granular Ferric Hydroxide, Activated Alumina, Sulfur Modified Iron, and Iron Oxide-Coated Microsand

机译：使用各种吸附剂去除水中的砷：磁性离子交换树脂，含水离子氧化物颗粒，氢氧化铁颗粒，活性氧化铝，硫改性铁和氧化铁涂层微砂

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摘要

The equilibrium and kinetic adsorption of arsenic on six different adsorbents were investigated with one synthetic and four natural types (two surface and two ground) of water. The adsorbents tested included magnetic ion exchange resins (MIEX), hydrous ion oxide particles (HIOPs), granular ferric hydroxide (GFH), activated alumina (AA), sulfur modified iron (SMI), and iron oxide-coated microsand (IOC-M), which have different physicochemical properties (shape, charge, surface area, size, and metal content). The results showed that adsorption equilibriums were achieved within a contact period of 20 min. The optimal doses of adsorbents determined for a given equilibrium concentration of C_(eq) = 10 ug/L were 500 mg/L for AA and GFH, 520-1,300 mg/L for MIEX, 1,200 mg/L for HIOPs, 2,500 mg/L for SMI, and 7,500 mg/L for IOC-M at a contact time of 60 min. At these optimal doses, the rate constants of the adsorbents were 3.9, 2.6, 2.5, 1.9,1.8, and 1.6 1/hr for HIOPs, AA, GFH, MIEX, SMI, and IOC-M, respectively. The presence of silicate significantly reduced the arsenic removal efficiency of HIOPs, AA, and GFH, presumably due to the decrease in chemical binding affinity of arsenic in the presence of silicate. Additional experiments with natural types of water showed that, with the exception of IOC-M,~the adsorbents had lower adsorption capacities in ground water than with surface and deionized water, in which the adsorption capacities decreased by approximately 60-95%.
机译：用一种合成水和四种自然类型（两种表面和两种地面）的水研究了砷在六种不同吸附剂上的平衡和动力学吸附。测试的吸附剂包括磁性离子交换树脂（MIEX），含水离子氧化物颗粒（HIOPs），颗粒状氢氧化铁（GFH），活性氧化铝（AA），硫改性铁（SMI）和氧化铁涂层微砂（IOC-M ），它们具有不同的理化特性（形状，电荷，表面积，尺寸和金属含量）。结果表明，在20分钟的接触时间内达到了吸附平衡。对于给定的平衡浓度C_（eq）= 10 ug / L，确定的最佳吸附剂量为AA和GFH为500 mg / L，MIEX为520-1,300 mg / L，HIOP为1,200 mg / L，2,500 mg / L接触时间为60分钟时，SMI为L，IOC-M为7,500 mg / L。在这些最佳剂量下，HIOP，AA，GFH，MIEX，SMI和IOC-M的吸附剂速率常数分别为3.9、2.6、2.5、1.9、1.8和1.6 1 / hr。硅酸盐的存在显着降低了HIOPs，AA和GFH的除砷效率，这可能是由于在硅酸盐存在下砷的化学结合亲和力降低所致。天然水的其他实验表明，除IOC-M以外，吸附剂对地下水的吸附能力低于地表水和去离子水，后者的吸附能力降低了约60-95％。

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  • 来源
    《Environmental engineering research》 |2011年第3期|p.165-173|共9页
  • 作者

    Shahnawaz Sinha; Gary Amy; Yeomin Yoon; Namguk Her;

  • 作者单位

    Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal, 23955-6000, Saudi Arabia;

    Water Desalination and Reuse Center, King Abdullah University of Science and Technology, Thuwal, 23955-6000, Saudi Arabia;

    Department of Civil and Environmental Engineering, University of South Carolina, Columbia, SC 29208, USA;

    Department ofChemistry and Environmental Sciences, Korea ArmyAcademy atYoung-Cheon, Yeongcheon, Cyeongbuk, 770-849, South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    adsorbents; arsenic removal; ion effect; sorption; water treatment;

    机译：吸附剂除砷;离子效应吸附水处理;

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