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首页> 外文期刊>Environmental Science & Technology >Atmospherically Stable Nanoscale Zero-Valent Iron Particles Formed under Controlled Air Contact: Characteristics and Reactivity
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Atmospherically Stable Nanoscale Zero-Valent Iron Particles Formed under Controlled Air Contact: Characteristics and Reactivity

机译：在受控空气接触下形成的大气稳定的纳米级零价铁颗粒：特性和反应性

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Atmospherically stable NZVI (nanoscale zero-valent iron) particles were produced by modifying shell layers of Fe~(H2) NZVI particles (RNIP-10DS) by using a controlled air contact method. Shell-modified NZVI particles were resistant to rapid aerial oxidation and were shown to have TCE degradation rate constants that were equivalent to 78% of those of pristine NZVI particles. Fe~(H2) NZVI particles that were vigorously contacted with air (rapidly oxidized) showed a substantially compromised reactivity. Aging of shell-modified particles in water for one day resulted in a rate increase of 54%, implying that depassivaton of the shell would play an important role in enhancing reactivity. Aging of shell-modified particles in air led to rate decreases by 14% and 46% in cases of one week and two months of aging, respectively. A series of instrumental analyses using transmission electron microscopy, X-ray diffractography, X-ray photoelectron spectroscopy, and X-ray absorption near-edge structure showed that the shells of modified NZVI particles primarily consisted of magnetite (Fe_3O_4). Analyses also implied that the new magnetite layer produced during shell modification was protective against shell passivation. Aging of shell-modified particles in water yielded another major mineral phase, goethite (α-FeOOH), whereas aging in air produced additional shell phases such as wuestite (FeO), hematite (α-Fe_2O_3), and maghemite (γ-Fe_2O_3).
机译：通过使用受控的空气接触方法对Fe〜（H2）NZVI颗粒（RNIP-10DS）的壳层进行改性，从而生产出大气稳定的NZVI（纳米级零价铁）颗粒。壳改性的NZVI颗粒具有抗快速空气氧化的作用，并显示其TCE降解速率常数等于原始NZVI颗粒的78％。与空气剧烈接触（快速氧化）的Fe〜（H2）NZVI颗粒的反应性大大降低。壳中修饰的颗粒在水中老化一天导致其速率增加54％，这意味着壳的去钝化将在增强反应性中起重要作用。空气中经过外壳改性的颗粒的老化导致老化1周和2个月的比率分别降低14％和46％。使用透射电子显微镜，X射线衍射，X射线光电子能谱和X射线吸收近边缘结构进行的一系列仪器分析表明，改性NZVI粒子的壳主要由磁铁矿（Fe_3O_4）组成。分析还暗示，在壳改性过程中产生的新磁铁矿层具有防止壳钝化的作用。水中经过贝壳修饰的颗粒的老化会产生另一种主要的矿物相，针铁矿（α-FeO​​OH），而在空气中老化则产生了另外的贝壳相，例如铁硅酸盐（FeO），赤铁矿（α-Fe_2O_3）和磁赤铁矿（γ-Fe_2O_3） 。

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  • 来源
    《Environmental Science & Technology》 |2010年第5期|p.1760-1766|共7页
  • 作者

    HONG-SEOK KIM; JUN-YOUNG AHN; KYUNG-YUP HWANG; IL-KYU KIM; INSEONG HWANG;

  • 作者单位

    School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, Busan, Korea 609-735;

    rnSchool of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, Busan, Korea 609-735;

    rnSchool of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, Busan, Korea 609-735;

    rnDepartment of Environmental Engineering, Pukyung National University, 599-1 Daeyeon 3-Dong, Nam-Gu, Busan, Korea 608-737;

    rnSchool of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, Busan, Korea 609-735;

  • 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);
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