SURFACE MODIFICATIONS OF ACTIVATED CARBON AND ITS IMPACT ON APPLICATION

Matheus Pego, Janaína Carvalho and David Guedes
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Matheus Pego: Department of Wood Science and Technology Federal, University of Lavras, Lavras 3037, Brazil
Janaína Carvalho: #x2020;Department of Chemistry Federal, University of Lavras, Lavras 3037, Brazil
David Guedes: Department of Wood Science and Technology Federal, University of Lavras, Lavras 3037, Brazil

Surface Review and Letters (SRL), 2019, vol. 26, issue 01, 1-10

Abstract: The main and new surface modification methods of activated carbon (AC) and their influence on application (adsorption capacity) were reviewed. Adsorption capacity is an important issue, contributing to hazardous substances environment management. According to literature, it is true that surface chemistry strongly affects adsorption capacity. Surface chemistry can be modified by several methods that lead to different activated carbon properties. Furthermore, adsorbate properties, and their relationships with surface structure, can impact adsorption properties. Surface modifications can be conducted by adding some atoms to the surface structure, making the surface more acidic or basic. Introduction of oxygen and ammonia atoms (chemical modification) are the main processes to make the surface more acidic and basic, respectively, although may bring chemical wastes to environment. Surface modification is done by chemical and physical modifications that lead activated carbons to present different properties. The main and new methods of chemical and physical modifications are compared and presented in this paper. Some new physical methods, like corona treatment, plasma discharge and microwave radiation, can be applied to cause surface modifications. Corona treatment can be a practical and new way to cause surface modification on an activated carbon surface.

Keywords: Corona treatment; surface chemistry; electric discharge; chemical modification; physical modification (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X1830006X

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