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2017

L) significantly enhanced the mobility of

ferrihydrite NPs, primarily due to the enhanced
electrostatic and steric stabilization originating

from excessively adsorbed HA molecules.
Interestingly, the transport of ferrihydrite NPs

is substantially lower in the presence of HAred
than in the presence of HAox. This distinct

effect (HAred vs. HAox) on the particle
transport is attributed to the fact that reductive

dissolution of ferrihydrite NPs occurs in the presence of HAred (ferrihydrite dissolves and thus
total breakthrough decreases), but not in the presence of HAox. Furthermore, the abatement

extent of ferrihydrite NPs transport triggered by the presence of HAred is dependent on
dissolved HAred concentration. Taken together, our findings provide direct, and much needed

insights into the distinct roles of redox state of HA on the transport of redox-sensitive metal-
bearing NPs in porous media.

论文链接：https://doi.org/10.1016/j.watres.2016.11.069

24. Formation, Aggregation, and Deposition Dynamics of NOM-Iron Colloids at
Anoxic-Oxic Interfaces
作 者 : Liao, Peng; Li, Wenlu; Jiang, Yi; 等 .

ENVIRONMENTAL SCIENCE & TECHNOLOGY 卷 : 51 期 : 21 页 : 12235-12245
出版年 : NOV 7 2017

摘 要：The important role of natural organic matter (NOM)–Fe colloids in influencing
contaminant transport, and this role can be influenced by the formation, aggregation, and particle

deposition dynamics of NOM-Fe colloids. In this work, NOM-Fe colloids at different C/Fe
ratios were prepared by mixing different concentrations of humic acid (HA) with 10 mg/L Fe(II)

under anoxic conditions. The colloids were
characterized by an array of techniques and

their aggregation and deposition behaviors
were examined under both anoxic and oxic

conditions. The colloids are composed of
HA-Fe(II) at anoxic conditions, while they

are made up of HA-Fe(III) at oxic conditions

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