The Effect of the Fiber Diameter, Epoxy-to-Amine Ratio, and Degree of PVA Saponification on CO2 Adsorption Properties of Amine-Epoxy/PVA Nanofibers
Chisato Okada, Zongzi Hou, Hiroaki Imoto, Kensuke Naka, Takeshi Kikutani, Midori Takasaki
TL;DR
This paper studies how fiber diameter, chemical ratios, and PVA saponification affect CO2 capture performance of nanofibers for direct air capture.
Contribution
The study introduces AE/PVA nanofibers with optimized properties for CO2 adsorption through controlled electrospinning and saponification.
Findings
Thinner fibers increase CO2 adsorption kinetics due to higher surface area.
Secondary amines balance adsorption capacity and desorption efficiency.
Highly saponified PVA improves thermal durability by reducing side reactions.
Abstract
Achieving carbon neutrality requires not only reducing CO2 emissions but also capturing atmospheric CO2. Direct air capture (DAC) using amine-based adsorbents has emerged as a promising approach. In this study, we developed amine-epoxy/poly(vinyl alcohol) (AE/PVA) nanofibers via electrospinning and in situ thermal polymerization. PVA was incorporated to enhance spinnability, and B-staging of AE enabled fiber formation without inline heating. We systematically investigated the effects of electrospinning parameters, epoxy-to-amine ratios (E/A), and the degree of PVA saponification on CO2 adsorption performance. Thinner fibers, obtained by adjusting spinning conditions, exhibited faster adsorption kinetics due to increased surface area. Varying the E/A revealed a trade-off between adsorption capacity and low-temperature desorption efficiency, with secondary amines offering a balanced…
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Taxonomy
TopicsCarbon Dioxide Capture Technologies · Membrane Separation and Gas Transport · Carbon dioxide utilization in catalysis