Reaction Kinetics on Allophane–Titania Nanocomposite Electrodes for Photofuel Cells

Nishikiori, Hiromasa; Furuichi, Naoyuki; Teshima, Katsuya; Yamashita, Hiromi

doi:10.1246/cl.170064

Cited by 6 publications

(1 citation statement)

References 29 publications

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“…It is reported that the hollow sphere walls consist of inner silica and outer alumina layers with a hydroxylated or hydrated surface, which is suggested to endow allophane with a significant ability to adsorb ionic or polar pollutants from the gaseous and aqueous phases due to its amphoteric ion-exchange activity and large specific surface area. Allophane's structure is convenient for even dispersion in host photocatalyst materials and efficient electron transport on the surface [205].…”

Section: Allophane-supported Photocatalystmentioning

confidence: 99%

Mineral-Supported Photocatalysts: A Review of Materials, Mechanisms and Environmental Applications

Simon

Bekheet

et al. 2022

Energies

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Although they are of significant importance for environmental applications, the industrialization of photocatalytic techniques still faces many difficulties, and the most urgent concern is cost control. Natural minerals possess abundant chemical inertia and cost-efficiency, which is suitable for hybridizing with various effective photocatalysts. The use of natural minerals in photocatalytic systems can not only significantly decrease the pure photocatalyst dosage but can also produce a favorable synergistic effect between photocatalyst and mineral substrate. This review article discusses the current progress regarding the use of various mineral classes in photocatalytic applications. Owing to their unique structures, large surface area, and negatively charged surface, silicate minerals could enhance the adsorption capacity, reduce particle aggregation, and promote photogenerated electron-hole pair separation for hybrid photocatalysts. Moreover, controlling the morphology and structure properties of these materials could have a great influence on their light-harvesting ability and photocatalytic activity. Composed of silica and alumina or magnesia, some silicate minerals possess unique orderly organized porous or layered structures, which are proper templates to modify the photocatalyst framework. The non-silicate minerals (referred to carbonate and carbon-based minerals, sulfate, and sulfide minerals and other special minerals) can function not only as catalyst supports but also as photocatalysts after special modification due to their unique chemical formula and impurities. The dye-sensitized minerals, as another natural mineral application in photocatalysis, are proved to be superior photocatalysts for hydrogen evolution and wastewater treatment. This work aims to provide a complete research overview of the mineral-supported photocatalysts and summarizes the common synergistic effects between different mineral substrates and photocatalysts as well as to inspire more possibilities for natural mineral application in photocatalysis.

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Section: Allophane-supported Photocatalystmentioning

confidence: 99%