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| Content Provider | Scientific Electronic Library Online (SciELO) |
|---|---|
| Author | Bakatula, Elisée N. Mosai, Alseno K. Tutu, Hlanganani |
| 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 SO4²" and CO3(2-), a significant reduction of 67.88 % and 71.63 %, respectively, in uranium uptake was observed. The distribution coefficient, K D(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. |
| Related Links | http://www.scielo.org.za/scielo.php?script=sci_abstract&pid=S0379-43502015000100023&lng=en&nrm=iso http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S0379-43502015000100023&lng=en&nrm=iso |
| Starting Page | 165 |
| Ending Page | 171 |
| Page Count | 7 |
| File Format | |
| ISSN | 03794350 |
| DOI | 10.17159/0379-4350/2015/V68A23 |
| Journal | South African Journal of Chemistry |
| Volume Number | 68 |
| Language | English |
| Publisher Date | 2015-01-01 |
| Publisher Institution | University of the Witwatersrand School of Chemistry Molecular Sciences Institute The South African Chemical Institute |
| Publisher Place | South Africa |
| Access Restriction | Open |
| Subject Keyword | Adsorption Zeolite-ammonium Uranyl Carbonate Sulphate Nitrate Aqueous solutions |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry |
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