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Pandian, Muthu Senthil
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article
Ti3C2Tx MXene decorated with NiMnO3 / NiMn2O4 nanoparticles for simultaneous photocatalytic degradation of mixed cationic and anionic dyes
Abstract
<p class="MsoNormal">The present report investigated the different mass ratios of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene decorated NiMnO<sub>3</sub> / NiMn<sub>2</sub>O<sub>4</sub> nanoparticles and their enhancement of photocatalytic performance. The NiMnO<sub>3</sub> / NiMn<sub>2</sub>O<sub>4</sub> - Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene nanocomposites were synthesized by a simple electrostatic self-assembly method. The physicochemical properties of nanocomposites were analyzed by XRD, SEM, and FESEM with EDAX, FTIR, PL, and UV-Visible spectrometer. The rhombohedral / cubic spinel structure of NiMnO<sub>3</sub> / NiMn<sub>2</sub>O<sub>4</sub> was confirmed by the XRD. The SEM and FESEM morphology show that spherical NiMnO<sub>3</sub> / NiMn<sub>2</sub>O<sub>4</sub> nanoparticles were decorated on the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene sheets and also present on the inside of the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene sheets. The average diameter of NiMnO<sub>3</sub> / NiMn<sub>2</sub>O<sub>4</sub> nanoparticles (46 nm) and the interlayer spacing of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene sheets (56 nm) were measured from FESEM analysis. The energy bandgap of NiMnO<sub>3</sub> / NiMn<sub>2</sub>O<sub>4</sub> - MXene nanocomposites was determined as ranging from 1.2 eV to 0.8 eV. The Ni, Mn, O, Ti, C, and F elemental compositions of the composites were analyzed by the EDAX. The effective photo-generated electron transferring from NiMnO<sub>3</sub> / NiMn<sub>2</sub>O<sub>4</sub> to Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene was established by the PL quenching of NiMnO<sub>3</sub> / NiMn<sub>2</sub>O<sub>4</sub>. The 100% degradation efficiency was achieved in methylene blue (MB). The mixed dye degradation rates achieved for Rhodamine B (RhB), methyl orange (MO), and methylene blue (MB) for 90%,72%, and 100% after 50 min in the presence of NiMnO<sub>3</sub> / NiMn<sub>2</sub>O<sub>4</sub> -Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene (20 wt. %). According to a scavenger experiment, the predominant species actively involved in the photodegradation process were revealed to •OH and •O<sub>2</sub><sup>-</sup>.</p>