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Synthesis of Polyaniline Nanoparticles With High Surface Area for CO2 and N2 Sorption
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Synthesis of Polyaniline Nanoparticles With High Surface Area for CO2 and N2 Sorption
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Journal Article
Synthesis of Polyaniline Nanoparticles With High Surface Area for CO2 and N2 Sorption
2025
Overview
Polyaniline nanoparticles (PANI NPs) in emeraldine salt (ES) and emeraldine base (EB) forms were synthesized via oxidative polymerization, with and without HCl stabilization, to investigate how subtle synthetic modifications affect structural, morphological, and gas sorption properties. Fourier‐transform infrared (FTIR) analysis confirmed the expected chemical structures and demonstrated that HCl acts as a protonic dopant and a morphological modifier. Scanning electron microscopy (SEM) and dynamic light scattering (DLS) measurements showed that HCl stabilization results in smaller, more uniform NPs and improved dispersion, particularly in the protonated (ES) form. Nitrogen (N2) and carbon dioxide (CO2) sorption studies revealed that PANI EB naturally exhibits a higher surface area and porosity due to its open‐chain structure. The addition of HCl has a stronger effect on PANI ES, increasing its pore volume and gas adsorption capacity by disrupting interchain interactions. Notably, CO2 uptake increased from 24.6 ± 1.2 to 30.6 ± 2.1 cm3/g upon stabilization, and the N2 uptake for native PANI EB was 144.4 ± 1.3 cm3/g. This work highlights the structure–function relationship between protonation state, morphology, and gas sorption behavior. By fine tuning synthesis parameters, PANI NPs with exceptional surface areas (up to 70.8 ± 2.1 m2/g) were achieved, positioning them as promising candidates for gas sorption and related environmental applications. Polyaniline nanoparticles (PANI NPs) in emeraldine salt and emeraldine base forms were synthesized with and without HCl to optimize gas sorption. HCl treated PANI ES reached a CO2 uptake of 30.6 cm3/g, while PANI EB exhibited exceptional N2 adsorption (144.4 cm3/g) and the highest reported specific surface area for oxidatively polymerized PANI (70.8 m2/g) surpassing most published results.
Publisher
John Wiley & Sons, Inc,Wiley-VCH
