Resumo

SIVANANDAN ACHARI, V.; RAJALAKSHMI, A. S.; JAYASREE, S.  e  LOPEZ, Raichel Mary. Surface Area and Porosity Development on Granular Activated Carbon by Zirconium: Adsorption Isotherm Studies. J. appl. res. technol [online]. 2018, vol.16, n.3, pp.211-228. ISSN 2448-6736.

In this study, a new series of coconut shell based granular activated carbons (GAC) are prepared by impregnating with zirconium ions as zirconyl chloride and activated under superheated steam. These carbons are designated with activation temperature/ conditions as GAC 383 (activated at 383K), GAGO 383 (HNO3 oxidised), GACZR 1273 (ZrOCl2 activated at 1273K) and GACOZR 1273 (HNO3 oxidised, ZrOCl2 activated at 1273K). Surface characteristics of these carbons are evaluated using Boehm titration methods, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction techniques (XRD), Scanning electrón microscopy (SEM) and Transmission electrón microscopy (TEM). The pore voliune and the respective specific surface área of each carbón are determined by BET, I plot, Langmuir, Freundlich, and Dubinin-Radushkevich isotherms using N2 adsorption data at 77K. Analysis shows that zirconium ion enhances the surface area and porosity of granular activated carbón. The adsorption characteristics of newly prepared GAC are tested by solid-liquid equilibria using phenol as adsórbate. Equilibrium phenol adsorption data fitted to standard isotherm models of Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) equations. Adsorption constants and parameters indícate that zirconium impregnated granular activated carbons are relatively more efficient for the removal of phenol than the native carbón used.

Palavras-chave : Adsorption; Granular activated carbón; Phenol; Pore volume; Surface area.

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