Biocide mechanism of highly efficient and stable antimicrobial surfaces based on zinc oxide-reduced graphene oxide photocatalytic coatings.

Highly efficient photoactive antimicrobial coatings were obtained using zinc oxide-reduced graphene oxide nanocomposites (ZnO-rGO). Their remarkable antibacterial activity and high stability demonstrated their potential use for photoactive biocide surfaces. The ZnO-rGO nanocomposites were prepared by the sol-gel technique to create photocatalytic surfaces by spin-coating.

Solar photocatalytic degradation of pesticides over TiO-rGO nanocomposites at pilot plant scale.

Two TiO-rGO nanocomposites were prepared by hydrothermal method from commercial TiO (P25 and Hombikat UV100, HBK). In both cases TiO nanoparticles appeared intimate and homogeneously distributed on rGO surface, but forming a dense network in P25-rGO nanocomposite, and a more open structure in HBK-rGO. Zeta potential and particle size distribution favored the ease of HBK-rGO nanocomposite to form stable suspensions.

Antimicrobial surfaces with self-cleaning properties functionalized by photocatalytic ZnO electrosprayed coatings.

Photoactive coatings of sol-gel ZnO suspensions were electrosprayed on glass substrates to produce self-cleaning antimicrobial functionalized surfaces. ZnO-functionalized materials exhibited a uniform external surface consisting of a pattern of microspheres with diameters in the 100-300 nm range. Electrospray allowed surface densities up to 0.

Antimicrobial and antibiofilm efficacy of self-cleaning surfaces functionalized by TiO photocatalytic nanoparticles against Staphylococcus aureus and Pseudomonas putida.

A photocatalytic sol of TiO nanoparticles has been used for creating self-cleaning antimicrobial flat and porous glass surfaces. The substrates were irradiated to study their photocatalytic properties and behavior in the presence of biofilm-forming bacteria. Smooth glass surfaces and glass microfiber filters were covered with 1.

Solar-assisted photodegradation of isoproturon over easily recoverable titania catalysts.

An easily recoverable homemade TiO catalyst (GICA-1) has been evaluated during the overall photodegradation process, understood as photocatalytic efficiency and catalyst recovery step, in the solar light-assisted photodegradation of isoproturon and its reuse in two consecutive cycles. The global feasibility has been compared to the commercial TiO P25. The homemade GICA-1 catalyst presented better sedimentation efficiency than TiO P25 at all studied pHs, which could be explained by its higher average hydrodynamic particle size (3 μm) and other physicochemical surface properties.