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A one-dimensional (1-D) mesoporous TiO₂ nanotube (TiNT) was successfully synthesized via a hydrothermal-calcination process, and employed in simultaneous photocatalytic Cu(2+) removal and H₂ production. Under irradiation, Cu(2+) 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 Cu(2+) reduction, noticeable H₂ was produced over the in-situ fabricated Cu incorporated TiNT (Cu-TiNT) photocatalyst, while H₂ evolution rate was controlled by the Cu(2+) reduction process, due to competition of electron capture between protons and Cu(2+). In addition, H₂ generation activity of Cu-TiNT depended on the initial Cu(2+)/Ti ratio, and could be depressed by co-existing ions in solution. Fast Cu(2+) reduction and remarkable H₂ evolution confirmed the feasibility of simultaneous Cu(2+) removal and H₂ production over a TiNT photocatalyst.

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