Titania-pillared molybdenum oxide as a new nanoporous photocatalyst

New nanoporous TiO2–MoO3 hybrids have been successfully synthesized via an exfoliation and reassembling method. According to the X-ray diffraction (XRD) pattern and transmission electron microscopy (TEM) analysis, quantum-sized titania nanoparticles with an average size of 1 nm were intercalated into the interlayer spaces of layered MoO3. Such a regularity of pillars results in a remarkable enhancement of the specific surface area, as confirmed by nitrogen adsorption–desorption measurements. The Langmuir specific surface area (210 m2 g−1) of TiO2-pillared MoO3 hybrid has been determined to be considerably larger than that (10 m2 g−1) of the self-restacked MoO3. It is evident that adequate intercalation of TiO2 nanoparticles into a MoO3 lattice gives rise to a highly nanoporous structure. The photocatalytic activity of the present nanoporous hybrid is much superior to that of layered molybdenum oxide alone in terms of the degradation of organic pollutant.

► Layered MoO3 is a potential photocatalyst. ► MoO3 was hybridized with TiO2 nanoparticle through exfoliation and reassembling. ► The resulting TiO2–MoO3 hybrid shows enhanced photocatalytic activity compared to MoO3 itself.