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Gold-decorated TiO$_2$ nanotubes were used for the photocatalytic abatementof Hg(II) in aqueous solutions. The presence of dewetted Au nanoparticlesinduces a strong enhancement of photocatalytic reduction and scavengingperformances, with respect to naked TiO$_2$. In the presence of chlorides, amassive formation of Hg2Cl2 nanowires, produced from Au nanoparticles, wasobserved using highly Au loaded photocatalysts to treat a 10 ppm Hg(II)solution. EDS and XPS confirmed the nature of the photo-produced nanowires. Inthe absence of chlorides and/or at lower Hg(II) starting concentrations, thescavenging of mercury proceeds through the formation of Hg-Au amalgams. Solarlight driven Hg(II) abatements up to 90% were observed after 24h. ICP-MSanalysis revealed that the removed Hg(II) is accumulated on the photocatalystsurface. Regeneration of Hg-loaded exhaust photocatalysts was easily performedby anodic stripping of Hg(0) and Hg(I) to Hg(II). After fourcatalytic-regeneration cycles only a 10% decrease of activity was observed.

Photocatalytic reduction and scavenging of Hg(II) over templated-dewetted Au on TiO$_2$ nanotubes