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Título: | Interlayer-Confined Cu(II) Complex as an Efficient and Long-Lasting Catalyst for Oxidation of H2S on Montmorillonite |
Autor: | Castellini, Elena; Bernini, Fabrizio; Sebastianelli, Lorenzo; Sainz-Díaz, C. Ignacio ; Serrano Rubio, Aída CSIC ORCID ; Castro, Germán R. CSIC ORCID ; Malferrari, Daniele; Brigatti, Maria Franca; Borsari, Marco | Fecha de publicación: | 31-may-2020 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | Minerals 10 (6): 510 (2020) | Resumen: | Removal of highly toxic H<sub>2</sub>S for pollution control and operational safety is a pressing need. For this purpose, a montmorillonite intercalated with Cu(II)-phenanthroline complex [Cu[(Phen)(H<sub>2</sub>O)<sub>2</sub>]<sup>2+</sup> (Mt-CuPhen) was prepared to capture gaseous H<sub>2</sub>S under mild conditions. This hybrid material was simple to obtain and demonstrated an outstanding ability to entrap H<sub>2</sub>S at room temperature, retaining high efficiency for a very long time (up to 36.8 g of S/100 g Mt-CuPhen after 3 months of exposure). Sorbent and H<sub>2</sub>S uptake were investigated by elemental analysis, X-ray powder diffraction measurements, diffuse reflectance (DR) UV–Vis and infrared spectroscopy, thermal analysis and evolved gas mass spectrometry, scanning electron microscopy equipped with energy-dispersive X-ray spectrometer, and X-ray absorption spectroscopy. The H<sub>2</sub>S capture was studied over time and a mechanism of action was proposed. The entrapping involves a catalytic mechanism in which [Cu[(Phen)(H<sub>2</sub>O)<sub>2</sub>]<sup>2+</sup> acts as catalyst for H<sub>2</sub>S oxidation to S<sup>0</sup> by atmospheric oxygen. The low cost and the long-lasting performance for H<sub>2</sub>S removal render Mt-CuPhen an extremely appealing trap for H<sub>2</sub>S removal and a promising material for many technological applications. | URI: | http://hdl.handle.net/10261/215690 | DOI: | 10.3390/min10060510 | Identificadores: | doi: 10.3390/min10060510 |
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