Soft-Templated Sol–Gel Synthesis of Mesoporous Perovskite-Type Multicomponent Metal Oxide (Bi0.2Na0.2K0.2La0.2Sr0.2)TiO3 and Its Enhanced Photocatalytic Activity
Hanzo Tsubota, Kazuki Inoue, Wai Kian Tan, Hiroyuki Muto, Atsunori Matsuda, Andrei Jitianu, Go Kawamura
TL;DR
A new low-temperature method creates a mesoporous photocatalyst with high surface area and six times better performance than commercial alternatives.
Contribution
A soft-templating sol–gel method enables low-temperature synthesis of a multicomponent perovskite with high surface area.
Findings
The catalyst achieved a specific surface area of 50.4 m² g⁻¹ at 400 °C.
It degraded methylene blue six times faster than commercial SrTiO3 under UV light.
Soft-templating improves photocatalytic performance by preserving surface area.
Abstract
The high calcination temperature required for the crystallization of multicomponent metal oxides is a challenge because this treatment significantly reduces their specific surface area while increasing the crystallite size, thereby limiting their photocatalytic performances. In this study, we have addressed this issue for a multicomponent perovskite photocatalyst, (Bi0.2Na0.2K0.2La0.2Sr0.2)TiO3 (BNKLST), by employing a soft-templating sol–gel method using Pluronic F-127. The synthesis process was optimized by adjusting the solution’s pH to ensure uniform micelle self-assembly and by determining the optimum calcination temperature for the pore formation. This approach enabled the successful low-temperature synthesis of BNKLST, which retained a high specific surface area of 50.4 m2 g–1 at 400 °C. The resulting catalyst exhibited excellent photocatalytic activity, degrading methylene blue…
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Taxonomy
TopicsAdvanced Photocatalysis Techniques · TiO2 Photocatalysis and Solar Cells · Dielectric properties of ceramics