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Interlayer-Confined Cu(II) Complex as an Efficient and Long-Lasting Catalyst for Oxidation of H2S on Montmorillonite

AuthorsCastellini, Elena; Bernini, Fabrizio; Sebastianelli, Lorenzo; Sainz-Díaz, C. Ignacio ; Serrano Rubio, Aída ; Castro, Germán R. ; Malferrari, Daniele; Brigatti, Maria Franca; Borsari, Marco
Issue Date31-May-2020
PublisherMultidisciplinary Digital Publishing Institute
CitationMinerals 10 (6): 510 (2020)
AbstractRemoval 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.
Identifiersdoi: 10.3390/min10060510
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