Fabrication of Highly Microporous Structure Activated Carbon via Surface Modification with Sodium Hydroxide

The aim of this study was to select the optimal conditions for the carbonization process followed by surface modification treatment with sodium hydroxide (NaOH) to obtain a highly microporous activated carbon structure derived from palm kernel shells (PKS) and coconut shells (CS). The effects of the...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Mohd Sahfani Hafizuddin, Chuan Li Lee, Kit Ling Chin, Paik San H’ng, Pui San Khoo, Umer Rashid
Formato: article
Lenguaje:EN
Publicado: MDPI AG 2021
Materias:
Acceso en línea:https://doaj.org/article/a1725cd5d4674367ad8313cec9136bc5
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
Descripción
Sumario:The aim of this study was to select the optimal conditions for the carbonization process followed by surface modification treatment with sodium hydroxide (NaOH) to obtain a highly microporous activated carbon structure derived from palm kernel shells (PKS) and coconut shells (CS). The effects of the carbonization temperature and NaOH concentration on the physiochemical properties, adsorption capability, specific surface area, surface morphology, and surface chemistry of PKS and CS were evaluated in this study. The results show that surface-modified activated carbons presented higher surface area values (CS: 356.87 m<sup>2</sup> g<sup>−1</sup>, PKS: 427.64 m<sup>2</sup> g<sup>−1</sup>), smaller pore size (CS: 2.24 nm, PKS: 1.99 nm), and larger pore volume (CS: 0.34 cm<sup>3</sup> g<sup>−1</sup>, PKS: 0.30 cm<sup>3</sup> g<sup>−1</sup>) than the untreated activated carbon, demonstrating that the NaOH surface modification was efficient enough to improve the surface characteristics of the activated carbon. Moreover, surface modification via 25% NaOH greatly increases the active functional group of activated carbon, thereby directly increasing the adsorption capability of activated carbon (CS: 527.44 mg g<sup>−1</sup>, PKS: 627.03 mg g<sup>−1</sup>). By applying the NaOH post-treatment as the ultimate surface modification technique to the activated carbon derived from PKS and CS, a highly microporous structure was produced.