Synthesis of hierarchical rose bridal bouquet- and humming-top-like TiO2 nanostructures and their shape-dependent degradation efficiency of dye

Brookite, the Least Known TiO2 Photocatalyst

“…Nguyen-Phan et al [25] prepared hierarchical brookite with a humming-top-like morphology by heating a solution containing 0.1 M NaOH, titanium isopropoxide and 2-propanol at 200 °C for 72 h. The gradual transformation from layered titanate to brookite phase was well consistent with the hypothesized formation mechanism of the hierarchical superstructure.…”

“…Inorganic and organic precursors such as TiCl 4 [21,24,[49][50][51][52][53][54][55][56][57][58], Ti(SO 4 ) 2 [18,[59][60][61][62], TiOSO 4 [63,64], TiCl 3 [3,19,[65][66][67][68], TiOCl 2 [16,69,70], titanate nanotubes [69,[71][72][73], titanium tetraisopropoxide [25,[74][75][76], titanium butoxide [77][78][79][80][81] and titanium tetraethoxide [82] have been employed.…”

“…humming-top-like nanostructures titanium isopropoxide hydrothermal treatment [25] macroporous spherical nanoparticles brookite nanoparticles spray drying with colloidal templating [96] hollow nanospheres titanium-peroxo-glycolate complex deposition on spherical polystyrene and hydrothermal treatment [97] pseudo-cube shaped nanocrystals titanium-peroxo complex oleate-modified hydrothermal treatment [95] Lin et al [27] synthesized brookite nanosheets with a regularly truncated tetragonal shape through a low-basicity hydrothermal process utilizing TiCl 4 as titanium source, urea as in situ OH complex transformed into single-crystalline nanosheets with specific facets exposed.…”

“…Nguyen-Phan et al [25] synthesized a hierarchical rose bridal bouquet nanostructure containing a mixture of layered titanate and brookite that revealed an excellent performance for the degradation of methylene blue. The contemporaneous presence of two phases with different band gap energy facilitated the interfacial electron transfer, reducing the electron/hole recombination and promoting the degradation efficiency (see Figure 12).…”

Enhanced photocatalytic activity of single-phase, nanocomposite and physically mixed TiO2 polymorphs

“…Pure brookite (B) phase was prepared using synthesis route similar to that reported by Nguyen-Phan et al [29]. TTIP (Sigma-Aldrich, ≥97.0%) was dropwise added to 50 ml of 2-propanol (Sigma-Aldrich, p.a., ≥99.8%) while mixing.…”