Carbon letters
- Volume 7 Issue 1
- /
- Pages.1-8
- /
- 2006
- /
- 1976-4251(pISSN)
- /
- 2233-4998(eISSN)
Modified Activated Carbons from Olive Stones for the Removal of Heavy Metals
- Youssef, A.M. (Faculty of Science, Mansoura University) ;
- El-Nabarawy, Th. (National Research Centre) ;
- El-Shafey, E.I. (Faculty of Science, Mansoura University)
- Received : 2005.12.18
- Accepted : 2006.03.17
- Published : 2006.03.30
Abstract
The activated carbon "C" was obtained by carbonization followed by activation with steam at 40% of burn-off. Oxidized carbons C-N, C-P and C-H were obtained by oxidizing the activated carbon C with concentrated nitric acid, ammonium peroxysulfate and hydrogen peroxide, respectively. The textural properties of the carbons were determined from nitrogen adsorption at 77 K. The acidic surface functional groups were determined by pH titration, base neutralization capacity and electrophoretic mobility measurements. The cation exchange capacities of un-oxidized and oxidized carbons were determined by the removal of Cu(II) and Ni(II) from their aqueous solutions. The surface area and the total pore volume decreased but the pore radius increased by the treatment of activated carbon with oxidizing agents. These changes were more pronounced in case of oxidation with