Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts.
Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts.
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源自模拟云处理矿物粉尘的纳米颗粒的胶体稳定性。
DOI：
10.1016/j.scitotenv.2013.07.119
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Kadar E
中科院分区：
文献类型：
--
作者：
Kadar E
为了更好地了解天然纳米材料的输入及其环境命运和生物有效性，对三种不同含铁量的模型粉尘(摩洛哥粉尘、利比亚粉尘和埃特纳灰尘)以及参照针铁矿和氢氧化铁进行了云处理的实验室模拟。用多种方法表征了纳米颗粒的铁溶解动力学、团聚/粒度分布、微观形态和颗粒悬浮液的胶体稳定性。结果表明：(1)火山灰中可酸浸铁含量最高(1 mg/−)，其次是利比亚和摩洛哥粉尘，含量低一个数量级；(2)暗处理样品中酸浸铁浓度与人工阳光下处理样品相似，但云处理后纳米颗粒的平均流体力学直径(pH=0~6)大于低pH条件下形成的纳米颗粒的尺寸和多分散性，而未改变zeta电位的样品表明胶体不稳定；四)云处理产生的较细颗粒中铁的相对百分比不能反映未经处理的尘埃(例如，火山灰和利比亚尘埃)中的铁含量。在大气尘埃衍生材料中常见的富含铁的“天然纳米颗粒”可能表明，它们在海洋环境中的存在比之前认为的更普遍。
Laboratory simulation of cloud processing of three model dust types with distinct Fe-content (Moroccan dust, Libyan dust and Etna ash) and reference goethite and ferrihydrite were conducted in order to gain a better understanding of natural nanomaterial inputs and their environmental fate and bioavailability. The resulting nanoparticles (NPs) were characterised for Fe dissolution kinetics, aggregation/size distribution, micromorphology and colloidal stability of particle suspensions using a multi-method approach. We demonstrated that the: (i) acid-leachable Fe concentration was highest in volcanic ash (1 mMg− 1dust) and was followed by Libyan and Moroccan dust with an order of magnitude lower levels; (ii) acid leached Fe concentration in the < 20 nm fraction was similar in samples processed in the dark with those under artificial sunlight, but average hydrodynamic diameter of NPs after cloud-processing (pH ~ 6) was larger in the former; iii) NPs formed at pH ~ 6 were smaller and less poly-disperse than those at low pH, whilst unaltered zeta potentials indicated colloidal instability; iv) relative Fe percentage in the finer particles derived from cloud processing does not reflect Fe content of unprocessed dusts (e.g. volcanic ash > Libyan dust). The common occurrence of Fe-rich “natural nanoparticles” in atmospheric dust derived materials may indicate their more ubiquitous presence in the marine environment than previously thought.
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