Mineral Nanoparticle Aggregation Alters Contaminant Transport under Flow

化学 纳米颗粒 流量(数学) 矿物 环境科学 环境化学 纳米技术 材料科学 有机化学 几何学 数学
作者
Lian Zhou,Laurent Lassabatère,N. Tan Luong,Jean-François Boily,Khalil Hanna
出处
期刊:Environmental Science & Technology [American Chemical Society]
卷期号:57 (6): 2415-2422 被引量:9
标识
DOI:10.1021/acs.est.2c09358
摘要

Iron oxyhydroxide nanoparticle reactivity has been widely investigated, yet little is still known on how particle aggregation controls the mobility and transport of environmental compounds. Here, we examine how aggregates of goethite (α-FeOOH) nanoparticle deposited on 100–300 μm quartz particles (GagCS) alter the transport of two emerging contaminants and two naturally occurring inorganic ligands–silicates and phosphates. Bromide tracer experiments showed no water fractionation into mobile and immobile water zones in an individual goethite-coated sand (GCS) column, whereas around 10% of the total water was immobile in a GagCS column. Reactive compounds were, in contrast, considerably more mobile and affected by diffusion-limited processes. A new simulation approach coupling the mobile-immobile equation with surface complexation reactions to surface reactive sites suggests that ∼90% of the binding sites were likely within the intra-aggregate zones, and that the mass transfer between mobile and immobile fractions was the rate-limited step. The diffusion-controlled processes also affected synergetic and competitive binding, which have otherwise been observed for organic and inorganic compounds at goethite surfaces. These results thereby call for more attention on transport studies, where tracer or conservative tests are often used to describe the reactive transport of environmentally relevant molecules.
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