Removal of uranium from aqueous solutions using ammonium-modified zeolite

Show simple item record Bakatula, E.N. Mosai, A.K. Tutu, H. 2016-11-22T10:15:20Z 2016-11-22T10:15:20Z 2015
dc.identifier.citation Bakatula, E.N., Mosai, A.K. and Tutu, H. 2015. South African Journal of Chemistry, 68, pp.165-171. en_ZA
dc.identifier.issn 0379-4350 (Print)
dc.identifier.issn 1996-840X (Online)
dc.description.abstract Batch experiments were conducted to study the effects of contact time, pH (3 to 8), initial concentration, presence of carbonate, sulphate, and competing ions (Fe3+, Ca2+, Sr2+, Mg2+) on the adsorption of U(VI) on ammonium-modified zeolite (AMZ). The structural features of the modified zeolite were assessed by Fourier Transform Infra Red Spectroscopy (FTIR) while the metal content was determined by Inductively Coupled Plasma Optical Emission Specroscopy (ICP-OES). The removal of uranium was effective and maximal under acidic conditions (pH 3 to 5). The kinetics of adsorption of U-nitrate and U-sulphate on AMZ were described by the pseudo-second-order model (R2 ≥ 0.9820). In the presence of SO4 2- and CO3 2-, a significant reduction of 67.88 % and 71.63 %, respectively, in uranium uptake was observed. The distribution coefficient, KD (L g-1), was in the order of: U-nitrate (1.116) > U-sulphate (0.029) > U-carbonate (0.019), suggesting that AMZ had a high affinity for U-nitrate. The presence of Fe3+ enhanced the removal of U(VI) from U-nitrate, U-sulphate and U-carbonate by 20.18 %, 72.48 % and 82.43 %, respectively, while the presence of Ca2+, Mg2+ and Sr2+ reduced the removal to 19.57 %, 31.60 % and 23.65 %, respectively. AMZ is an effective adsorbent for uranium removal from aqueous solutions dominated by nitrate, carbonate and sulphate. en_ZA
dc.language.iso en en_ZA
dc.publisher South African Chemical Institute en_ZA
dc.subject Adsorption en_ZA
dc.subject Aqueous solutions en_ZA
dc.subject Carbonate en_ZA
dc.subject Nitrate en_ZA
dc.subject Sulphate en_ZA
dc.subject Uranyl en_ZA
dc.subject Zeolite-ammonium en_ZA
dc.title Removal of uranium from aqueous solutions using ammonium-modified zeolite en_ZA
dc.type Article en_ZA
dc.journal.volume 68 en_ZA
dc.journal.title South African Journal of Chemistry en_ZA
dc.description.librarian SP2016 en_ZA
dc.citation.doi 10.17159/0379-4350/2015/v68a23 en_ZA
dc.citation.epage 171 en_ZA
dc.citation.issue 68 en_ZA
dc.citation.spage 165 en_ZA

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