Thermally treated lanthanum oxide nanoparticles-embedded polyamide composite nanofiber membrane for enhanced mechanical properties and phosphorus adsorption kinetics
Yun Young Choi, David M. Cwiertny, Nosang V. Myung
TL;DR
This study creates a nanofiber membrane with lanthanum oxide nanoparticles that improves mechanical strength and phosphorus adsorption after thermal treatment.
Contribution
A novel composite nanofiber membrane with embedded La2O3 nanoparticles and enhanced properties via thermal treatment is developed.
Findings
La2O3 nanoparticles remain well-suspended in polyamide 6 nanofibers using HFIP as a solvent.
Post-thermal treatment increases mechanical strength and phosphorus adsorption kinetics without reducing adsorption capacity.
The membrane maintains a high phosphorus uptake capacity of ~10.4 mg/g after thermal treatment.
Abstract
Lanthanum oxide (La2O3) nanoparticles-embedded polyamide 6 nanofiber membranes were electrospun using hexafluoroisopropanol (HFIP) as the solvent. Unlike other solvents such as formic acid and an acetone: trifluoroacetic acid (ace: TFA) mixture, HFIP allowed La2O3 nanoparticles to remain well-suspended without altering their composition. Various material characterizations confirmed La2O3 nanoparticles are well embedded in polyamide nanofibers. The phosphorus uptake capacity remains consistent when La2O3 nanoparticles were embedded in polyamide 6 nanofibers (∼10.4 mg/g) compared to free suspended nanoparticles (∼10.3 mg/g). By optimizing post-thermal treatment, both mechanical strength (e.g., yield strength (σy) from 1.68 × 107 to 2.67 × 107 Pa) and adsorption kinetics (e.g., k2 from 2.63 × 10−2 to 1.49 × 10−1 g/(mg·min)) were improved. This study confirms that post thermal processing…
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Taxonomy
TopicsPhosphorus and nutrient management · Layered Double Hydroxides Synthesis and Applications · Adsorption and biosorption for pollutant removal