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Adsorption of ng L-1-level arsenic by ZIF-8 nanoparticles: application to the monitoring of environmental water

机译：ZIF-8纳米粒子的Ng L-1级砷的吸附：在环境水监测中的应用

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摘要

The provisional contamination level of arsenic in drinking water is 10 g L-1. For decreasing this value to a safer level, a more precise method for analyzing dissolved arsenic is required. With this aim, we synthesized zeolitic imidazolate framework-8 (ZIF-8) in the aqueous phase and characterized its potential application for monitoring the trace arsenic in fresh water. In this regard, we report following three notable outcomes. First, we demonstrate the excellent performance of ZIF-8 nanoparticles (nZIF-8) for the adsorption of ng L-1 levels of AsO43-. nZIF-8 is able to adsorb over 99% of arsenic from as low as 10 ng L-1 AsO43- solutions. This performance was maintained even in the presence of commonly coexisting anions, for example, 90% adsorption from a 0.1 g L-1 arsenic solution was observed in the presence of 10 mg L-1 of Cl-, NO3-, CO32-, or SO42-, or 1 mg L-1 of PO43-. Second, we clarified that the mechanism of arsenic adsorption by ZIF-8 is simply a ligand exchange process, in which the As(v) oxide anion replaces the imidazolate unit in the framework. Third, we propose a handy scheme for the analysis of ng L-1 levels of arsenic in drinking water, in which nZIF-8 is used for the concentration of trace level AsO43-. By doing this, as low as 100 ng L-1 arsenate in drinking water can be quantified by colorimetric analysis, the detection limit of which is 5 g L-1 in pure water. The application of this scheme is expected to highly enhance AsO43- detection first by concentrating it to an easily detectable range, and second by excluding the majority of interfering ions present in the system. Therefore, a reduction in the minimum quantifying limit of arsenic in fresh water to as low as 1 ng L-1 can be expected if the method is coupled with ICP-MS.
机译：饮用水中砷的临时污染水平为10g l-1。为了将该值降低到更安全的水平，需要更精确的分析溶解砷方法。通过这种目的，在水相中，在水相中合成了沸石咪唑酯骨架-8（ZIF-8），并表征了其用于监测淡水中痕量砷的潜在应用。在这方面，我们报告了三次值得注意的结果。首先，我们证明了ZIF-8纳米颗粒（NZIF-8）的优异性能，用于吸附NG L-1水平ASO43-。 NZIF-8能够吸附超过99％的砷，低至10ng L-1 ASO43-溶液。这种性能被保持，即使在通常共存阴离子的存在，例如，＆在10毫克L-1的Cl-，NO3-，CO32-存在下观察到从0.1克L-1砷溶液90％吸附，或SO42-或1mg L-1的PO43-。其次，阐明了ZIF-8的砷吸附机理仅仅是一种配体交换过程，其中AS（v）氧化物阴离子在框架中取代了咪唑酯单元。第三，我们提出了一种分析饮用水中砷的Ng L-1水平的便利方案，其中NZIF-8用于痕量ASO43-的浓度。通过这样做，低至100ng L-1在饮用水中可以通过比色分析量化，其检测极限在纯水中为5 g l-1。该方案的应用预计首先将其集中到易于检测的范围，并且第二通过排除系统中存在的大多数干扰离子来高度增强ASO43-检测。因此，如果该方法与ICP-MS耦合，则可以预期淡水中砷中砷的最小量化极限降低至低至1ng的L-1。

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  • 来源
    《RSC Advances》 |2018年第63期|共9页
  • 作者

    Parajuli Durga; Sue Kiwamu; Takahashi Akira; Tanaka Hisashi; Kawamoto Tohru;

  • 作者单位

    Natl Inst Adv Ind Sci &

    Technol Nanomat Res Inst 1-1-1 Higashi Tsukuba Ibaraki 3058565 Japan;

    Natl Inst Adv Ind Sci &

    Technol Res Inst Chem Proc Technol 1-1-1 Higashi Tsukuba Ibaraki 3058565 Japan;

    Natl Inst Adv Ind Sci &

    Technol Nanomat Res Inst 1-1-1 Higashi Tsukuba Ibaraki 3058565 Japan;

    Natl Inst Adv Ind Sci &

    Technol Nanomat Res Inst 1-1-1 Higashi Tsukuba Ibaraki 3058565 Japan;

    Natl Inst Adv Ind Sci &

    Technol Nanomat Res Inst 1-1-1 Higashi Tsukuba Ibaraki 3058565 Japan;

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  • 正文语种 eng
  • 中图分类 化学;
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