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Electromagnetic wave absorption of coconut fiber-derived porous activated carbon

Yusuf, J.Y. and Soleimani, H. and Yahya, N. and Sanusi, Y.K. and Kozlowski, G. and öchsner, A. and Adebayo, L.L. and Wahaab, F.A. and Sikiru, S. and Balogun, B.B. (2021) Electromagnetic wave absorption of coconut fiber-derived porous activated carbon. Boletin de la Sociedad Espanola de Ceramica y Vidrio .

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

In this study, porous carbon has been prepared through potassium hydroxide (KOH) activation of coconut fiber (CF) and subsequent carbonization in the presence of an inert gas. The activated carbons (AC) were prepared via carbonization of the precursor at different temperatures. Subsequently, their electromagnetic wave absorption (EMWA) performance was investigated at X-band frequency. The phase crystallinity, porous features, and degree of graphitization of the activated carbons were studied using XRD, nitrogen adsorption/desorption isotherm, and Raman spectroscopy, respectively. Using the BET method, the activated carbon prepared at 750 °C displayed a high specific surface area of 602.9 m2 g-1 and an average pore size of 6 nm, which confirms the extant of mesopores. The EMWA was studied using COMSOL Multiphysics software based on the finite element method. Results show that the activated carbon prepared at 750 °C attained an optimal reflection loss of -45.6 dB at 10.96 GHz with a corresponding effective bandwidth of 3.5 GHz at a thickness of 3.0 mm. In conclusion, this study interestingly shows that porous carbon obtained from coconut fiber has great potential for attenuating electromagnetic waves. © 2021 SECV.

Item Type:Article
Impact Factor:cited By 0
Uncontrolled Keywords:Activated carbon; Carbonization; Circular waveguides; Crystallinity; Electromagnetic waves; Gas adsorption; Inert gases; Pore size; Porous materials; Potassium hydroxide, Coconut fiber; Comsol multiphysics; Effective bandwidth; High specific surface area; Meso-pores; Nitrogen adsorption; Reflection loss; X-band frequencies, Electromagnetic wave absorption
ID Code:23913
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:19 Aug 2021 13:24
Last Modified:19 Aug 2021 13:24

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