Nanofiber Enabled, Multi - Target Passive Sampling Device for Determination of the Freely Dissolved Sediment Pore Water Concentrations of Organic Contaminants
Technical Report,01 May 2015,01 Jun 2016
The University of Iowa Iowa City United States
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We used electrospinning to fabricate a suite of electrospun nanofiber mats ENMs and test their sorption capacities to a set of hydrophilic aniline and nitrobenzene and hydrophobic compounds PCBs and Dioxin to be used as next-generation multi-target passive samplers. The average diameter of the ENMs ranged from 70 PET to 1,000 EVA nm, with a relative standard deviation of less than 50 for each material. Our ENMs in water yielded a fast equilibration time 3 days for our tested hydrophilic and hydrophobic compounds. The ENM-water partition coefficient KENM-w for the hydrophilic compounds ranged from 0.72 to 2.8 log units, with evidence suggesting uptake via partitioning into the bulk nanofiber i.e. absorption and specific binding interactions e.g., H-bonding and Coulombic interactions contributing to, and potentially controlling, hydrophilic uptake. The KENM-w for hydrophobic compounds ranged from 3.2 to 6.4 log units. Collectively, the rates and KENM-w measured for the best performing ENMs often exceeded partition coefficients achieved with commercially available passive sampling materials e.g., low-density polyethylene and PDMS glass fiber, particularly for hydrophilic compounds. Overall, our results support our initial hypothesis that electrospun nanofiber mats represent next-generation passive sampling materials that can be easily modified to enhance compound selectivity, sorption capacities and improve field applications.
- Miscellaneous Materials
- Polymer Chemistry