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XPS characterization and E. Coli DNA degradation using functionalized Cu/TiO<inf>2</inf> nanobiocatalysts

Abstract:

New copper compounds were proposed as alternative toxic agents against Nosocomial Infections (NI); in contrast with other copper complexes reported in the literature, they were inorganic nanobiocatalysts. The design of diverse Cu species such as Cu(0), Cu(I) and Cu(II) over TiO2 has enabled us to induce hydrogen bonds in the nanoparticle network. The main objective of this research is to use copper instead of silver to avoid the high cost at industrial level, of the use of silver. Four Cu/TiO2 precursors were used and these were functionalized using phosphates, sulfates and organic compounds on the external and internal surface (Cu/TiO2-F). The chemical state of central metal and the surface composition were studied by XPS and the materials were analyzed by Electronic Paramagnetic Resonance and UV–vis spectroscopies, and finally they were microbiologically tested against E. Coli.