A Hydrofluoric Acid-Free Green Synthesis of Magnetic M.Ti2CTx Nanostructures for the Sequestration of Cesium and Strontium Radionuclide
<p dir="ltr">MAX phases are the parent materials used for the formation of MXenes, and are generally obtained by etching using the highly corrosive acid HF. To develop a more environmentally friendly approach for the synthesis of MXenes, in this work, titanium aluminum carbide MAX ph...
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| مؤلفون آخرون: | , , , , |
| منشور في: |
2022
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| الملخص: | <p dir="ltr">MAX phases are the parent materials used for the formation of MXenes, and are generally obtained by etching using the highly corrosive acid HF. To develop a more environmentally friendly approach for the synthesis of MXenes, in this work, titanium aluminum carbide MAX phase (Ti<sub>2</sub>AlC) was fabricated and etched using NaOH. Further, magnetic properties were induced during the etching process in a single-step etching process that led to the formation of a magnetic composite. By carefully controlling etching conditions such as etching agent concentration and time, different structures could be produced (denoted as <i>M.Ti</i><sub><em>2</em></sub><i>CT</i><sub><em>x</em></sub>). Magnetic nanostructures with unique physico-chemical characteristics, including a large number of binding sites, were utilized to adsorb radionuclide Sr<sup>2+</sup> and Cs<sup>+</sup> cations from different matrices, including deionized, tap, and seawater. The produced adsorbents were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The synthesized materials were found to be very stable in the aqueous phase, compared with corrosive acid-etched MXenes, acquiring a distinctive structure with oxygen-containing functional moieties. Sr<sup>2+</sup> and Cs<sup>+</sup> removal efficiencies of <i>M.Ti</i><sub><em>2</em></sub><i>CT</i><sub><em>x</em></sub> were assessed via conventional batch adsorption experiments. <i>M.Ti</i><sub><em>2</em></sub><i>CT</i><sub><em>x</em></sub><i>-A</i><sub><em>III</em></sub> showed the highest adsorption performance among other <i>M.Ti</i><sub><em>2</em></sub><i>CT</i><sub><em>x</em></sub> phases, with maximum adsorption capacities of 376.05 and 142.88 mg/g for Sr<sup>2+</sup> and Cs<sup>+</sup>, respectively, which are among the highest adsorption capacities reported for comparable adsorbents such as graphene oxide and MXenes. Moreover, in seawater, the removal efficiencies for Sr<sup>2+</sup> and Cs<sup>+</sup> were greater than 93% and 31%, respectively. Analysis of the removal mechanism validates the electrostatic interactions between <i>M.Ti</i><sub><em>2</em></sub><i>C-A</i><sub><em>III</em></sub> and radionuclides.</p><p dir="ltr"><br></p><h2>Other Information</h2><p dir="ltr">Published in: Nanomaterials<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3390/nano12183253" target="_blank">https://dx.doi.org/10.3390/nano12183253</a></p> |
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