Surface properties and photoactivity of silica prepared by surface modification

Fuji, Masayoshi; Maruzuka, Nanami; Takei, Takashi; Watanabe, Tohru; Chikazawa, Masatoshi; Tanabe, Katsuyuki; Mitsuhashi, Kohei

doi:10.1016/s0167-2991(01)82220-5

Cited by 2 publications

(3 citation statements)

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“…For this reason, the single modifier reacts with a hydroxyl group on the surface of the alumina particles without polymerization among modifiers. At the same time, owing to steric hindrance with the stearoyl groups, individual Ti atoms appeared to exist on the surface of the alumina particles, separated from each other at a regular specific distance between the atoms [17][18] . In order for these features to be utilized for accurate surface design of alumina powder, the authors chose the above-mentioned modifier.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Incidentally, the photocatalytic activity of binary metal oxides is strongly governed by the conditions of presence and surface structure of TiO 2 ; these two factors greatly affect whether or not TiO 2 can function as a photocatalyst. For TiO 2 /SiO 2 systems, this tendency was studied with a CVD process 15) , an ion injection process 16) and a surface modification process 17) . However, a similar study was still lacking for TiO 2 /Al 2 O 3 systems.…”

Section: Introductionmentioning

confidence: 99%

“…However, a similar study was still lacking for TiO 2 /Al 2 O 3 systems. To address this issue, the authors have attempted atomic level surface design for alumina powder by employing a surface modification processes in order to allow TiO 2 to be supported on Al 2 O 3 [17][18] . With this technique, the authors introduced Ti atoms onto the surface of alumina particles (the base material) to increase gradually Ti sites on the alumina particles, thereby transforming Al 2 O 3 into a photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

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Surface Structure and Photocatalytic Activity of Ti Supported on Alumina Powder [Translated]<sup>†</sup>

Fuji

Sugiyama

Takei

et al. 2004

KONA

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Surface modified alumina powder that has photocatalytic activity was studied. To control the amount of Ti introduced on the surface at the molecular level, the powder was prepared by chemical surface modification with a monofunctional titanate-based coupling agent, followed by partial oxidation of the modification group. The surface density of Ti introduced onto the surface was quantitatively increased with the concentration of the modifying reagent, and/or repetition of the modification. Furthermore, the relationship between the surface structure and the occurrence of photocatalytic activity was examined. The surface structure was measured by XPS and UV-Visible absorption spectrometry. The photocatalytic activity was determined by measuring the degradation of Methylene Blue molecules in water solution with UV irradiation. Photocatalytic activity was realized at a Ti surface density of 3.7 nm Ҁ2. The optical absorption edge in UV of the sample shifted to longer wavelengths. The ability as a photocatalyst increased with the amount of Ti-O-Ti. Photocatalytic activity was recognized to be related to the amount of Ti-O-Ti on the alumina surface and the ability of UV absorption.

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Section: Sample Preparationmentioning

confidence: 99%