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首页> 外文期刊>Environmental Science & Technology >Particle Size and Aggregation Effects on Magnetite Reactivity toward Carbon Tetrachloride
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Particle Size and Aggregation Effects on Magnetite Reactivity toward Carbon Tetrachloride

机译：粒度和聚集对磁铁矿对四氯化碳反应性的影响

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Nanoparticulate magnetite is found in many natural and engineered environments. This study characterized the reactivity of this material toward carbon tetrachloride (CCl_4). Particle diameter plays an important role, with nominal < 9 nm > magnetite suspensions exhibiting greater reactivity on both mass (k_m) and surface area normalized (k_(SA)) bases than < 80 nm > magnetite suspensions. For the < 9 nm > suspension, the aggregation state of the particles affects the measured k_m values. At 0.001 M ionic strength and pH 7, k_m (=0.052-0.139 L g~(-1) h~(-1)) was as much as seven times larger than at 1 M (km - 0.025-0.030 L g~(-1) h~(-1)). This decrease in reactivity with an increase in ionic strength is related to the measured diameter of the aggregates present in solution, thus implicating aggregate size as an important variable. This work is the first to indicate that both particle size and aggregation state must be considered when evaluating the reactivity of nanoparticle suspensions with groundwater contaminants.
机译：纳米颗粒磁铁矿存在于许多自然环境和工程环境中。这项研究表征了该材料对四氯化碳（CCl_4）的反应性。粒径起着重要作用，标称<9 nm>磁铁矿悬浮液在质量（k_m）和归一化表面积（k_（SA））碱上均表现出比<80 nm>磁铁矿悬浮液更高的反应性。对于<9 nm>悬浮液，颗粒的聚集状态会影响测量的k_m值。在0.001 M的离子强度和7的pH值下，k_m（= 0.052-0.139 L g〜（-1）h〜（-1））是1 M（km-0.025-0.030 L g〜（ -1）h〜（-1））。反应性随离子强度的增加而降低与溶液中存在的聚集体的测量直径有关，因此暗示了聚集体大小是重要的变量。这项工作首次表明在评估纳米颗粒悬浮液与地下水污染物的反应性时，必须同时考虑粒径和聚集状态。

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