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Vol. 28 No. 4 (2016): Vol 28 Issue 4

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Solid Phase Extractive Pre-Concentration of Uranium(VI) from Liquid Waste onto Peach Stone Steam Pyrolysis Activated Carbon

https://doi.org/10.14233/ajchem.2016.19424
H.M.H. Gad
Hot Labs & Waste Management Center, Egyptian Atomic Energy Authorities, P.O. 13759, Cairo, Egypt
T.F. Mohammaden
Nuclear Materials Authority, Cairo, Egypt
M.A. Mahmoud
Nuclear Materials Authority, Cairo, Egypt

Corresponding Author(s) : H.M.H. Gad

hamdigad22@gmail.com

Asian Journal of Chemistry, Vol. 28 No. 4 (2016): Vol 28 Issue 4

Abstract

Drinking water contaminants, especially heavy metals and uranium, have been recognized as a worldwide problem pose a serious threat to human health. Among several treatment technologies applied for contaminant removal, adsorption methods have been studied extensively and proven to offer satisfactory results with high selectivity. In this study, steam pyrolysis activated carbons from biomass were synthesized with characterizations giving a higher capacity for uranium and other heavy metal contaminants. In this study, a batch equilibration pre-concentration of uranium(VI) was carried out in the pH range (2-10), adsorbent dosage (0.166-0.833 g L-1), sorption time (5 min to 24 h), temperatures (25, 50 and 70 °C), different types of activated carbon precursor, uranium initial concentration (50-500 mg L-1) and different interfering ions (cations: Cr, Pb, Fe, K and anions: NO3-, Cl-, SO42-, HPO42-). The equilibrium data fitted well to the Freundlich and Langmuir equilibrium models in the studied concentration range and temperatures. The kinetics of the adsorption process followed a second-order adsorption and intra-particle diffusion is not the only rate determining step. 0.25 M H2SO4 was effective in uranium recovery. The results indicated that the conversion of naturally abundant peach stone of the nuisance value to valuable material exhibited considerable potential for application in pre-concentration and separation of uranium from aqueous solution.

Keywords

Pre-concentration Uranium(VI) Liquid waste Peach stone Steam pyrolysis activated carbon
Gad, H., Mohammaden, T., & Mahmoud, M. (2015). Solid Phase Extractive Pre-Concentration of Uranium(VI) from Liquid Waste onto Peach Stone Steam Pyrolysis Activated Carbon. Asian Journal of Chemistry, 28(4), 751–760. https://doi.org/10.14233/ajchem.2016.19424
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