ChemInform Abstract: Photocatalytic Activities of Microcrystalline TiO2 Incorporated in Sheet Silicates of Clay.

Abstract

033ChemInform Abstract Compared to those of TiO2 powder particles, showing the quantum size effect, TiO2 microcrystallites incorporated in the interlayer of montmorillonite having ca. 15-å pillar height show a ca. 0.58-eV blue shift in its absorption and fluorescence spectra. The difference in the excited energy levels between the two kinds of photocatalysts amounts to 0.36 eV, the TiO2/clay being higher than the TiO2 powder. The photocatalytic activities for decomposition of 2-propanol to give acetone and H2 and of m-carboxylic acids with up to 8 carbons to give the corresponding alkanes and CO2 are greater in the case of the pillared TiO2. However, the pillared TiO2 exhibits lower activities for decomposition of capric acid.

Adsorption and degradation of model volatile organic compounds by a combined titania–montmorillonite–silica photocatalyst

“…Many organic [11,12] or inorganic cations [13,14] are intercalated into the silicate layers of clays to synthesize diversified pillared materials. Of them, extensive concern has been focused on the TiO 2 pillared clay which can be applied to adsorb various organics from water and air [15][16][17][18].…”

Enhanced Photocatalytic Activity of TiO2-Coated NaY and HY Zeolites for the Degradation of Methylene Blue in Water

“…However, fine particle sized photocatalyst dispersed in water to be treated by irradiation poses difficulties as separation of the catalyst by post-reaction filtration is tedious and costly. As a result, many researchers have examined methods for dispersing TiO 2 particles on solid support materials like glass, 1,2 optical fiber, 2,3 silica, 4 electrode, 5,6 clays, 7,8 stainless steel mesh, 9 and zeolites. [11][12][13] Zeolites due to their large surface areas, internal pore volume, unique uniform pores, and channel size [12][13][14][15][16][17][18] are interesting hosts to disperse semiconductor photocatalyst on their surfaces.…”

Zeolit Üzerine Desteklenmiş Fe Katkılı TiO2 üzerinde İndigo Boyasının Fotobozunmasının Araştırılması

“…Bu, TiO2'nun fotokatalitik aktivitesini arttırır. TiO2 nanotozları için bir destek malzemesi olarak; çoğunlukla aktif karbon [18], cam lifi [19], kil [20][21][22], ve zeolitler [23][24][25] incelenmiştir. Bu destek malzemeleri arasında, zeolitler, yüksek yüzey alanı, düzgün gözenekleri, fotokimyasal kararlılığı, çevre dostu oluşu, hidrofilik/hidrofobik özellikleri ve ayrıca organik kirleticiler için yüksek adsorpsiyon kapasitesiyle dikkat çekmektedirler [26][27][28].…”