Enhanced photocatalytic activity of titanium dioxide/allophane mixed powder by acid treatment

Ono, Yoshiki; Katsumata, Ken Ichi

doi:10.1016/j.clay.2013.12.018

Cited by 8 publications

(6 citation statements)

References 15 publications

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“…The changes in the amounts of acetaldehyde and carbon dioxide gases are plotted in Fig. 4 as a function of the UV irradiation time using the absorbances at 2730 cm -1 (O = C-H stretching vibration of acetaldehyde) and 2309 cm -1 (C = O stretching vibration of carbon dioxide) [18], [19].…”

Section: Resultsmentioning

confidence: 99%

Low-temperature synthesis of cerium oxide nanorods and their suppressive effect on photocatalysis of titanium dioxide

Ono

Fujii

2015

Ceramics International

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Section: Resultsmentioning

confidence: 99%

Low-temperature synthesis of cerium oxide nanorods and their suppressive effect on photocatalysis of titanium dioxide

Ono

Fujii

2015

Ceramics International

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“…The presence of allophane leads to an increase in the adsorption of titanium and inhibits the emission of phosgene (COCl 2 ) and dichloroacetyl chloride; intermediate products of trichloroethylene decom-position, which once adsorbed on allophane are gradually degraded after diffusing towards titanium. The photocatalytic activity of the composite improves with treatment in acidic medium, which can be observed in the photocatalytic decomposition of gaseous acetaldehyde [53] .…”

Section: Photocatalysismentioning

confidence: 94%

Allophane, a natural nanoparticle present in andisols of equatorial Ecuador, properties and applications

Silva-Yumi

Martínez

Medina

et al. 2022

CAN

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Allophane is a natural nanoparticle present in soils of volcanic origin such as andisols, which are distributed around the world in countries with volcanic activity. In Ecuador, andisols constitute 30% of the territory in high and humid areas of the northern highlands. Allophane can be obtained from andisols through physical and chemical processes, or it can be synthesized. This nanomaterial has multiple properties for various applications in different areas. There is a lot of research on these nanoparticles and this type of soils, but they have not been studied yet in Ecuador. In this article, the structural characteristics, properties, formation, isolation, synthesis and uses of allophane are presented, with the ﬁnish of generating knowledge and encouraging research on these soils that are the source of the aforementioned nanoparticle. The literature search was performed in Science Direct and Google Scholar databases, and high impact articles related to natural or synthetic allophane research were used. The particular characteristics that allophane has allows it to be used as an environmental remediator, bactericide, anti-inﬂammatory, flame retardant, enzyme support, but in addition it has been studied in catalysis, photocatalysis and electrocatalysis. Considering the area covered by allophane in the Ecuadorian territory and its availability, it can be used for research based on international studies that have been developed to take advantage of it in the environmental and medical areas.

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“…Compared with the mechanical mixing sample of allophane/TiO 2 , the final product's CO 2 concentration produced from the allophane/TiO 2 nanocomposite was three times higher due to the homogeneous dispersion of allophane into TiO 2 . As an amorphous silica source, allophane was selectively dissolved by acid treatment and mixed with TiO 2 at various mass ratios [207]. It was found that the photocatalytic activity evaluated by gaseous acetaldehyde degradation was improved with over 5 mass% mixing ratio of allophane despite the specific surface area decrease.…”

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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Enhanced photocatalytic activity of titanium dioxide/allophane mixed powder by acid treatment

Cited by 8 publications

References 15 publications

Low-temperature synthesis of cerium oxide nanorods and their suppressive effect on photocatalysis of titanium dioxide

Low-temperature synthesis of cerium oxide nanorods and their suppressive effect on photocatalysis of titanium dioxide

Allophane, a natural nanoparticle present in andisols of equatorial Ecuador, properties and applications

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

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