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- W2157016060 endingPage "12847" @default.
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- W2157016060 abstract "The sorption properties of natural organic matter (NOM) with oxidized multiwalled carbon nanotubes (O-MWCNTs) in simple electrolytes has been studied, as well as the effect that NOM concentration, pH, and O-MWCNT surface chemistry have on CNT stability under environmentally relevant conditions. As O-MWCNT oxygen content increased, NOM sorption decreased in simple electrolytes for a common set of solution conditions. For each O-MWCNT, NOM sorption increased with increasing ionic strength and decreasing pH, although the sensitivity of NOM sorption to these water quality parameters increased as the O-MWCNT oxygen content increased. Collectively, these observations indicate that NOM sorption by O-MWCNTs is determined by favorable hydrophobic π-π interactions that are moderated by repulsive electrostatic forces between negatively charged carboxylic acid functional groups on the O-MWCNTs and NOM. Stability studies conducted in artificial groundwater revealed that CNT stability is influenced by both the NOM concentration and pH, but stability was largely independent of the O-MWCNT oxygen concentration. These findings contrast with the marked effect that surface oxygen has on CNT stability in simple electrolytes. Electrophoretic mobility measurements revealed that the stabilizing effects of adsorbed NOM are due to the introduction of steric repulsion between NOM-coated CNTs, rather than from changes to surface charge." @default.
- W2157016060 created "2016-06-24" @default.
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- W2157016060 date "2012-11-19" @default.
- W2157016060 modified "2023-10-16" @default.
- W2157016060 title "Influence of Surface Oxygen on the Interactions of Carbon Nanotubes with Natural Organic Matter" @default.
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- W2157016060 doi "https://doi.org/10.1021/es303157r" @default.
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