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Title

A new material based on montmorillonite and Cu(II)-phenanthroline complex for effective capture of ammonia from gas phase

AuthorsCastelleni, Elena; Marferrari, Daniele; Bernini, Fabrizio; Bighi, Beatrice; Mucci, Adele; Sainz-Díaz, C. Ignacio; Serrano Rubio, Aída ; Castro, Germán R. ; Brigatti, Maria Franca; Borsani, Marco
KeywordsGas trapping
Montmorillonite
Intercalation
Copper complexes
Interlayer
Issue Date1-Jan-2020
PublisherElsevier BV
CitationApplied Clay Science 184: 105386 (2020)
AbstractThe intercalation of [Cu(Phen)(H2O)2]2+ (CuPhen) in montmorillonite (Mt) produces a stable hybrid material that is very efficient in removing NH3 from gas phase even at extremely low pressures. The process was studied by elemental analysis, X-ray powder diffraction, thermal analysis coupled with evolved gas mass spectrometry and DR UV¿Vis, NMR and X-ray absorption spectroscopy. The adsorption of CuPhen on Mt consists of two consecutive steps. During the first one, CuPhen intercalates alone into Mt through a cation exchange process, afterwards CuPhen and SO42¿ ions entry jointly into the mineral interlayer. The two-steps adsorption process is described by a VI-type isotherm, successfully fitted by two independent Frumkin isotherms. NH3 trapping is long-lasting, easy, fast even at extremely low gas pressure and reversible under mild conditions. Mt containing CuPhen always results well performant in removing ammonia from gas phase, but an appreciably higher adsorption capacity of NH3 is obtained when SO42¿ ion is absent from the interlayer. This hybrid montmorillonite is thus a promising material to be used in industrial or environmental contexts, as an efficient air-cleaner.
Publisher version (URL)http://dx.doi.org/10.1016/j.clay.2019.105386
URIhttp://hdl.handle.net/10261/211712
Identifiersdoi: 10.1016/j.clay.2019.105386
issn: 1872-9053
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