Preparation of titania foams having an open cellular structure and their application to photocatalysis

Immobilization of TiO2 into Self‐Supporting Photocatalytic Foam: Influence of Calcination Temperature

“…The self‐supporting TiO 2 foams were prepared using a modified protocol of Yamamoto and Imai A polyacrylamide gel was created using 1.5 g acrylamide (Fluka) and 0.015 g N ‐ N '‐methyleenbisacrylamide (Sigma‐Aldrich, Gillingham, UK) which was then mixed with 13 g distilled water. Afterward, 2.9 g TiOSO 4 (Sigma‐Aldrich) and 4 g ureum (Fluka, Seelze, Germany) were added as well as 2 mL of a 30% NaOH solution (Merck, Darmstadt, Germany).…”

“…Moreover, tailoring pore size and pore volume is possible by adjusting the process parameters during the manufacturing of the self‐supporting material . Yamamoto and Imai describe a self‐supporting TiO 2 foam produced from a polyacrylamide gel containing TiOSO 4 as titanium source and urea as chemical blowing agent. This foam showed an acceptable degradation potential in both the gaseous and the aqueous phase, but further improvement on the rigidity is needed to make it industrially applicable.…”

UV-A photocatalytic treatment of Legionella pneumophila bacteria contaminated airflows through three-dimensional solid foam structured photocatalytic reactors

“…Yamamoto and Imai prepared foam-based photocatalysts, with the synthesis of anatase titania nanoparticle foams with open cellular structure by calcination of polyacrylamide gels containing titanyl sulfate and urea [18]. The titania foams showed under UV-A illumination a disappearance rate 2.5 and 4 times greater than that shown by fluffy commercial TiO 2 P25 in the case of methylblue dye decomposition in water and gas phase acetaldehyde removal, respectively.…”

Hierarchical Porous, Self‐Supporting La‐ and F‐Codoped TiO2 with High Durability for Continuous‐Flow Visible Light Photocatalysis

“…However, porous TiO 2 is usually produced in the form of very fine powders, which may result in pore blocking, diffusion limitation, and a decrease in the area of the active site within the interior of the porous TiO 2 . An alternative is to develop synthetic methods to prepare tough, self‐supporting, and hierarchical porous TiO 2 for more facile internal molecule and light diffusion 3–6 . Here, we use a polymer gel template to prepare hierarchical porous, self‐supporting La‐ and F‐codoped TiO 2 with high durability.…”