Synthesis of Titanium Dioxide Nanoparticles with Mesoporous Anatase Wall and High Photocatalytic Activity

Abstract

Mesoporous titanium dioxide nanosized powder with high specific surface area and anatase wall was synthesized via hydrothermal process by using cetyltrimethylammonium bromide (CTAB) as surfactant-directing agent and pore-forming agent. The resulting materials were characterized by XRD, nitrogen adsorption, FESEM, TEM, and FT-IR spectroscopy. The as-synthesized mesoporous TiO2 nanoparticles have mean diameter of 17.6 nm with mean pore size of 2.1 nm. The specific surface area of the as-synthesized mesoporous nanosized TiO2 exceeded 430 m2/g and that of the samples after calcination at 600 degrees C still have 221.9 m2/g. The mesoporous TiO2 nanoparticles show significant activities on the oxidation of Rhodamine B (RB). The large surface area, small crystalline size, and well-crystallized anatase mesostructure can explain the high photocatalytic activity of mesoporous TiO2 nanoparticles calcined at 400 degrees C.

Photocatalysis of Sub-ppm-level Isopropyl Alcohol by Plug-flow Reactor Coated with Nonmetal Elements Irradiated with Visible Light

“…In turn, these findings suggested that the prepared S-and N-TiO2 photocatalysts could be effectively activated by visible-light irradiation. [19,21,22]. When compared with that of pure TiO2 previously reported by other researchers as well [23,24], the frequency was moved to a slightly lower wavelength for both types of the N-and S-TiO2.…”

“…This frequency movement is likely due to the interaction between the doped N or S and H atoms [24,25]. The bands below 1,000 cm -1 are assigned to the titania crystal lattice vibration [21,22]. It is noteworthy that no distinct N-or S-associated peaks were observed for the FTIR results of the as-prepared photocatalysts.…”

“…It is noteworthy that no distinct N-or S-associated peaks were observed for the FTIR results of the as-prepared photocatalysts. This is attributable to small amounts of N or S elements doped into TiO2 [19,21,22]. Regarding both types of photocatalysts, the cleaning efficiency of IPA increased as the AFR was decreased.…”

Mesoporous titania photocatalysts: preparation, characterization and reaction mechanisms

“…The most commonly used organic templates were amphiphilic poly(alkylene oxide) block copolymers, such as HO-(CH 2 CH 2 O) 20 (CH 2 CH(CH 3 )O) 70 ( 17 and cetyltrimethylammonium bromide (CTAB) ( Table 1). [29][30][31][32]43,[45][46][47]87,100 TiO 2 is an interesting material for photocatalytic applications and it is regarded as the most efficient and environmentally benign photocatalyst, and it has been most widely used for photodegradation of various pollutants such as methylene blue (MB), 30,37,52,55,57 methyl orange (MO), 30,39 Escherichia coli (E. coli), 57,60 Rhodamine B (RhB) 36,[46][47][48] Rhodamine 6G (Rh6G) 29 and phenol 27,47 (Table 1). The principle of the semiconductor photocatalytic reaction is straightforward.…”

Highly synergistic antimicrobial activity of spherical and flower-like hierarchical titanium dioxide/silver composites

“…In the FT-IR (Fig. S3), the peaks around 3430, 1630 and 1380 cm -1 could be attributed to the O-H stretching vibration and O-H bending of water molecules adsorbed onto the surface of the particles [33] , respectively. The broad band around 680 cm -1 observed was associated with TiO 2 crystal lattice vibrations [34,35] .…”