Production of granular activated carbon from fruit stones and nutshells and evaluation of their physical, chemical and adsorption properties
A. Aygün, S. Yenisoy-Karakab and I. Dumana
Microporous and Mesoporous Materials Volume 66, Issues 2-3 , 5 December 2003, Pages 189-195
2003
บทคัดย่อ
An investigation of several agricultural wastes (almond shell, hazelnut shell, walnut shell and apricot stone) revealed that their suitability for granular activated carbon production is not determined by material specific (elemental composition) but type-specific features. Granular activated carbons were evaluated for their physical (attrition, bulk density), chemical (elemental composition, %weight loss), surface (surface area, surface chemistry) and adsorption properties (iodine number, phenol and methylene blue adsorption). Pyrolysis temperature and activation time with ZnCl2 had influence on the phenol and methylene blue adsorption capacities of especially for the activated carbons produced from hazelnut and walnut shells. Adsorption isotherm data were fitted to both Langmuir and Freundlich models. The following order of suitability of raw materials for activated carbon production was established: hazelnut shell > walnut shell > apricot > stonealmond shell.