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Improve in CO2 and CH4 Adsorption Capacity on Carbon Microfibers Synthesized by Electrospinning of PAN

1
Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, 09340 CDMX, México
2
Departamento de Ingeniería Química y Bioquímica, Instituto Tecnológico de Oaxaca, 68030 Oaxaca de Juárez, México
3
División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica (IPICyT), 78216 San Luis Potosí, México
*
Authors to whom correspondence should be addressed.
Fibers 2019, 7(10), 81; https://doi.org/10.3390/fib7100081
Received: 23 August 2019 / Revised: 13 September 2019 / Accepted: 18 September 2019 / Published: 21 September 2019
Carbon microfibers (CMF) has been used as an adsorbent material for CO2 and CH4 capture. The gas adsorption capacity depends on the chemical and morphological structure of CMF. The CMF physicochemical properties change according to the applied stabilization and carbonization temperatures. With the aim of studying the effect of stabilization temperature on the structural properties of the carbon microfibers and their CO2 and CH4 adsorption capacity, four different stabilization temperatures (250, 270, 280, and 300 °C) were explored, maintaining a constant carbonization temperature (900 °C). In materials stabilized at 250 and 270 °C, the cyclization was incomplete, in that, the nitrile groups (triple-bond structure, e.g., C≡N) were not converted to a double-bond structure (e.g., C=N), to form a six-membered cyclic pyridine ring, as a consequence the material stabilized at 300 °C resulting in fragile microfibers; therefore, the most appropriate stabilization temperature was 280 °C. Finally, to corroborate that the specific surface area (microporosity) is not the determining factor that influences the adsorption capacity of the materials, carbonization of polyacrylonitrile microfibers (PANMFs) at five different temperatures (600, 700, 800, 900, and 1000 °C) is carried, maintaining a constant temperature of 280 °C for the stabilization process. As a result, the CMF chemical composition directly affects the CO2 and CH4 adsorption capacity, even more directly than the specific surface area. Thus, the chemical variety can be useful to develop carbon microfibers with a high adsorption capacity and selectivity in materials with a low specific surface area. The amount adsorbed at 25 °C and 1.0 bar oscillate between 2.0 and 2.9 mmol/g adsorbent for CO2 and between 0.8 and 2.0 mmol/g adsorbent for CH4, depending on the calcination treatment applicated; these values are comparable with other material adsorbents of greenhouse gases. View Full-Text
Keywords: CMF; CO2 adsorption; CH4 adsorption; PANMFs; electrospinning; stabilization temperature; carbonization temperature CMF; CO2 adsorption; CH4 adsorption; PANMFs; electrospinning; stabilization temperature; carbonization temperature
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MDPI and ACS Style

Ojeda-López, R.; Esparza-Schulz, J.M.; Pérez-Hermosillo, I.J.; Hernández-Gordillo, A.; Domínguez-Ortiz, A. Improve in CO2 and CH4 Adsorption Capacity on Carbon Microfibers Synthesized by Electrospinning of PAN. Fibers 2019, 7, 81.

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