Removal and recovery of Th4+ and UO22+ ions from aqueous solutions by adsorption onto glauconite (dark green color) | ||||
| Journal of Scientific Research in Science | ||||
| Article 23, Volume 33, part1, September 2016, Page 260-280 PDF (699.81 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jsrs.2016.15646 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Ahmed Azzam  ; Bahaa Ahmed Salah; Said A. Sayed
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| Faculty of Science, Helwan University, AinHelwan, Helwan, Cairo, Egypt | ||||
| Abstract | ||||
| As a natural and low-cost material, glauconite is applied as an adsorbent to remove Th4+ and UO22+ ions from aqueous solutions by a batch system. Two different samples of glauconite (dark green and light green color) are delivered from Baharia Oases, Egypt. The effects of analytical parameters such as pH, contact time, concentration of metal ion, mass adsorbent, interfering ions, and temperature on adsorption on glauconite (dark green) are investigated. The similar uptake percentage of the two different glauconite samples (dark green and light green) at certain condition verify the role of Si-OH in the proposed adsorption mechanism. Isotherm studies of the adsorption are also carried out to understand the nature of adsorption of Th4+ and UO22+ ions on glauconite (dark green). Equilibrium data are best fitted with Langmuir model. The adsorption capacity of Th4+ and UO22+ ions is found to be 50 and 40 mgg-1, respectively. Thermodynamic parameters ΔHo, ΔSo and ΔGo values showed that the sorption process was endothermic (ΔHo > 0), had increased entropy (ΔSo > 0) and spontaneous (ΔGo < 0). The retained metals are eluted by using different reagents. The preconcentration could be made selective to UO22+ ions by using HNO3 0.1 M, NaCl 0.9 M and oxalic acid 0.1 M rather than Th4+ ions. | ||||
| Keywords | ||||
| Removal; Uranium; Thorium; Glauconite; sorption isotherms | ||||
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