Photocatalysis of methylene blue on titanium dioxide nanoparticles synthesized by modified sol-hydrothermal process of TiCl4

Abstract

Titanium dioxide nanoparticles were synthesized by the hydrolysis and condensation of TiCl 4 , an economic titanium precursor, in a mixed solvent of iso-propyl alcohol and water. As-prepared powders were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), energy filtering transmission electron microscopy (EF-TEM). To examine the photocatalytic activity of the as-prepared TiO 2 , the photodegradation of MB which is a typical dye resistant to biodegradation has been investigated on TiO 2 powders in aqueous heterogeneous suspensions. The photocatalytic activity of TiO 2 powders prepared by the hydrolysis of TiCl 4 in the mixed solutions of iso-PrOH/H 2 O exceeded that of commercial TiO 2 powders. The apparent first order rate constants (k app ) for the photodegradation of methylene blue (MB) showed a good correlation with the absorbance area obtained by UV-VIS DRS on wavelength in the limits of used lamp emission 300$420 nm.

Ternary g-C3N4/ZnO/AgCl nanocomposites: Synergistic collaboration on visible-light-driven activity in photodegradation of an organic pollutant

“…Similar to the many reports, decrease of M a n u s c r i p t 14 the degradation rate constant at higher calcination temperature could be related to aggregation and growth of the particle sizes at higher temperatures [27,49].…”

Novel magnetically separable g-C3N4/AgBr/Fe3O4 nanocomposites as visible-light-driven photocatalysts with highly enhanced activities

“…It is clear that the degradation rate constant decreases with calcination of the sample and the nanocomposite without any thermal treatment has the highest rate constant. Decrease of the degradation rate constant could be related to aggregation and growth of the particle sizes at higher temperatures [34].…”

The role of graphene oxide content on the adsorption-enhanced photocatalysis of titanium dioxide/graphene oxide composites

“…Accordingly, the results presented in Fig. 8 show that the photodecomposition of methylene blue on TiO 2 and composite materials obeys the Langmuir-Hinshelwood (L-H) first-order kinetic model [7,27,28,30,[33][34][35]. By fitting to the logarithmic expression, the apparent rate constant (k app ) was estimated and summarized in Table 2.…”