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EFFECT OF POLYMER RATIO ON NZVI LOADING ONTO ELECTROSPUN NANOFIBER MAT FOR MITIGATING GROUNDWATER CONTAMINANTS
Ren, J., H.K. Shon, and L.D. Tijing.
TechConnect Briefs: Materials for Energy, Efficiency and Sustainability 2:265-268(2017)
Although nanoscale zero-valent iron (NZVI) has been widely used for the reduction of halogenated organics and heavy metals in the groundwater, individual NZVI particles are mobile and prone to aggregate, thereby reducing the reaction sites exposed to contaminants. The high specific area and size-controllable and material-compatible properties of the electrospun polymer nanofiber mat provides a means to immobilize and distribute NZVI particles. When NZVI particles were immobilized onto polyacrylic acid-polyvinyl alcohol (PAA-PVA) electrospun nanofiber mats with different PAA/PVA ratios, results indicated that a PAA/PVA ratio of 3:1 immobilized the most NZVI particles (more than 48 wt% immobilized on the mat) and had the highest removals of methylene blue at 94% and Cu(II) ions at 84%. The high uptake was attributed to the higher porosity of the mat as well as to an increased number of free carboxylic groups available on the cross-linked nanofibers. https://briefs.techconnect.org/papers/effect-of-polymer-ratio-on-nzvi-loading-onto-electrospun-nanofiber-mat-for-mitigating-groundwater-contaminants/
TechConnect Briefs: Materials for Energy, Efficiency and Sustainability 2:265-268(2017)
Although nanoscale zero-valent iron (NZVI) has been widely used for the reduction of halogenated organics and heavy metals in the groundwater, individual NZVI particles are mobile and prone to aggregate, thereby reducing the reaction sites exposed to contaminants. The high specific area and size-controllable and material-compatible properties of the electrospun polymer nanofiber mat provides a means to immobilize and distribute NZVI particles. When NZVI particles were immobilized onto polyacrylic acid-polyvinyl alcohol (PAA-PVA) electrospun nanofiber mats with different PAA/PVA ratios, results indicated that a PAA/PVA ratio of 3:1 immobilized the most NZVI particles (more than 48 wt% immobilized on the mat) and had the highest removals of methylene blue at 94% and Cu(II) ions at 84%. The high uptake was attributed to the higher porosity of the mat as well as to an increased number of free carboxylic groups available on the cross-linked nanofibers. https://briefs.techconnect.org/papers/effect-of-polymer-ratio-on-nzvi-lo
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