Preparation and characterization of SiO2-pillared H2Ti4O9 and its photocatalytic activity for methylene blue degradation

Pillaring and photocatalytic properties of mesoporous α-Fe2O3/titanate nanocomposites via an exfoliation and restacking route

“…The smaller band gap of a-Fe 2 O 3 pillared titanate, compared to its postcalcined derivative, probably results from the calcination at high temperature, which led to the part separation of pillared structure between titanate layers and a-Fe 2 O 3 pillaring. A similar case has also been encountered in the titanium oxidepillared montmorillonite system [33]. Since the wavelength of visible light is in the range of 400-700 nm, with the corresponding E g value being from 3.1 to 1.77 eV, the obtained E g values imply that the as-prepared nanocomposites have a high visible-light-induced photocatalytic activity, compared to that of layered titanate.…”

Fe-doped and ZnO-pillared titanates as visible-light-driven photocatalysts

“…The injected electrons will be captured by the surface-adsorbed O 2 molecules to yield O ÅÀ 2 and HOO Å radicals in competition with the back excitation to the dye molecules, which is favorable for the adsorption of MB and thus enhances the activity of a mesoporous catalyst. It is noted that the mesoporosity provides less sterical hindrance than that of the microporosity, which is favorable for the adsorption of organic molecules, the diffusion rates of the substrate, product and intermediate molecules and thus enhances the activity of a mesoporous catalyst [8,22]. In the cases of H 0.68+x Ti 1.83Àx Fe x O 4 ÁH 2 O and Cs 0.68+x Ti 1.83Àx Fe x O 4 , MB molecules hardly penetrate into the interlayers due to the narrow interlayer space.…”

“…Recently, layered semiconductor materials have been widely used as catalysts and catalyst supports, derived from their good chemical stability, high specific surface areas, unique cation exchange, semiconducting and swelling properties [4,5]. Of these compounds, lepidocrocite titanates are a popular layered transition metal oxide material with versatile composition, in which cesium titanate can be delaminated into 2D molecular single sheets (i.e., titanate nanosheets) and has been used as a starting material to prepare pillared nanocomposites [6][7][8][9]. It has been demonstrated that cesium titanate has similar physical and chemical properties to TiO 2 such as high resistance to photoinduced corrosion [2].…”

Sono-intercalation of CdS nanoparticles into the layers of titanate facilitates the sunlight degradation of Congo red

“…The narrow band gap semiconductor in the nanocomposite not only acts as the sensitizer, but also reduces the recombination rate of the photo-generated electronhole pair that is a major limitation in normal semiconductors [17][18][19]. The intercalation process requires several steps and it is so complicated and often takes at least one week via a traditional methods due to the mass transfer limitation [20].…”