A New Water-Soluble Ammonium Citratoperoxotitanate as an Environmentally Beneficial Precursor for TiO₂ Thin Films and RuO₂/BaTi₄O₉ Photocatalysts

Abstract

We demonstrate applicability of (NH4)8[Ti4(C6H4O7)4(O2)4]·8H2Owater-soluble titanium complexfor preparation of oxide materials containing titanium in the form of thin films by dip coating and fine powders by the sol−gel method. Anatase thin films and RuO2/BaTi4O9 powders were selected as examples of photocatalytic materials, which synthesis is not trivial and functional properties depend essentially on the sample purity and morphology. The utilized technique yielded excellent samples quality; the obtained films and powders demonstrate good photocatalytic activity.

Synthesis and photocatalytic property of BaTi4O9/RuO2 nanocomposites

“…Photocatalytic composite materials are typically made by impregnation of a powder of the host compound with an aqueous solution of a metal salt, followed by appropriate heat treatments [16,17]. The BaTi 4 O 9 nanobelts or bulk powder was suspended into an aqueous solution containing RuCl 3 (1 wt% of Ru relative to BaTi 4 O 9 ) and the suspension was stirred for 4 h at 70 8C until most of the water had evaporated.…”

“…So, in order to improve the photocatalytic splitting of water abilities, one efficient way may be to develop nanostructured photocatalysts with extremely improved surface areas, because the large surface area can increase active sites at which the photocatalytic reaction occurs or small particle size diminishes the distance of transfer of the photo-generated electrons and holes from the bulk to the surface [8][9][10][11][12][13][14][15]. Kakihana et al have reported the photocatalytic activity for the decomposition of water in the BaTi 4 O 9 /RuO 2 material prepared via the PC route is higher than that in the sample prepared by the conventional solid-state reaction method and suggested that the remarkable increase of the photocatalytic reaction is at least partly attributable to the large surface area of the BaTi 4 O 9 /RuO 2 powder via the PC route [16,17]. Another critical point among the factors affecting the photocatalytic properties is structural anisotropy because of the promotion of charge separation associated with inhibition of the charge recombination process.…”

A Water‐Soluble Titanium Complex for the Selective Synthesis of Nanocrystalline Brookite, Rutile, and Anatase by a Hydrothermal Method

“…[13] Therefore, the main incentive of this work was to broaden the range of water-soluble titanium compounds, in particular with a lower content of carbon per titanium atom, that are suitable for the fabrication of oxide materials. With this in mind we decided to use glycolic acid (HOCH 2 COOH), which is the simplest hydroxycarboxylic acid.…”

Synthesis of picolinate-iron(III) compounds through an aqueous solution process

“…21)23) It was also clarified that application of the complexes led to formation of ceramics with controlled nano and micro structures. 24), 25) In addition, complexes and MOFs can be used as self-template for synthesis of oxides with unique structures.…”