Removal of Pesticide (Endosulphan) from Water via Adsorption onto Activated Carbons Developed from Date Pits

• Journal title : Carbon letters
• Volume 8, Issue 2,  2007, pp.101-107
• Publisher : Korean Carbon Society
• DOI : 10.5714/CL.2007.8.2.101
Title & Authors
Removal of Pesticide (Endosulphan) from Water via Adsorption onto Activated Carbons Developed from Date Pits
Ashour, Sheikha.S.;

Abstract
Activated carbons were prepared by impregnation of crushed clean date pits in concentrated solutions of phosphoric acid or zinc chloride followed by carbonization in absence of air at $\small{600^{\circ}C}$. Steam-activated carbon was prepared by gasifying $\small{600^{\circ}C}$-carbonization product at $\small{950^{\circ}C}$ to a burn-off = 50%. KOH- activated carbon was prepared by impregnating date pitscarbonization product obtained at $\small{450^{\circ}C}$ in concentrated KOH solution followed by carbonization at $\small{840^{\circ}C}$. Textural properties of these carbons were determined from nitrogen adsorption at $\small{-196^{\circ}C}$ and the chemistry of the carbon surface was investigated by determination and of the surface carbon-oxygen (C-O) groups using bases of variable strength and dilute HCl. The adsorption of endosulphan at $\small{27^{\circ}C}$ on all the carbons prepared was undertaken. Adsorption of this pesticide at 32 and $\small{37^{\circ}C}$ was also undertaken for steam-activated and KOH-activated carbons. Phosphoric acid-activated carbons and steamactivated carbons are mainly microporous and have high surface concentration of C-O groups of acidic nature. Steamactivated and KOH-activated carbons exhibited surface areas > 1000 $\small{m^2/g}$ and contain micro and non-micrpores. The adsorption of endosulphan was related to the surface area of non-micropores and was retarded by the high concentration of surface C-O groups. The thermodynamic properties indicated the feasibility of the adsorption process and the possible regeneration of the carbon for further use.
Keywords
Language
English
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