Simultaneous copper ion removal and hydrogen production from water over a TiO2 nanotube photocatalyst

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Courtesy of IWA Publishing

A one-dimensional (1-D) mesoporous TiO2 nanotube (TiNT) was successfully synthesized via a hydrothermal-calcination process, and employed in simultaneous photocatalytic Cu2+ removal and H2 production. Under irradiation, Cu2+ in the wide concentration range of 8–800 ppm, could be reduced rapidly, and the reduction was not severely impacted by co-existing inorganic ions in solution. Simultaneous with Cu2+ reduction, noticeable H2 was produced over the in-situ fabricated Cu incorporated TiNT (Cu–TiNT) photocatalyst, while H2 evolution rate was controlled by the Cu2+ reduction process, due to competition of electron capture between protons and Cu2+. In addition, H2 generation activity of Cu–TiNT depended on the initial Cu2+/Ti ratio, and could be depressed by co-existing ions in solution. Fast Cu2+ reduction and remarkable H2 evolution confirmed the feasibility of simultaneous Cu2+ removal and H2 production over a TiNT photocatalyst.

Keywords: copper ion removal, hydrogen production, TiO2 nanotube

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