Preparation and photocatalytic activity analysis of nanometer TiO₂ modified by surfactant

Abstract

Combining the advantages of the sol-gel method and solvothermal method, the single anatase phase of nano-titanium dioxide (TiO 2) with high crystallinity had been prepared by means of the sol-solvent thermal improved process, in which butyl titanate was used as titanium source; anhydrous ethanol as solvent; concentrated nitric acid as inhibitor; and cationic surfactant cetyl trimethyl ammonium bromide (CTAB), anionic surfactant sodium dodecyl benzene sulfonate (SDBS), and nonionic surfactant polyethylene glycol (PEG) as dispersants. The analysis results of Brunauer-Emmett-Teller, scanning electron microscopy, and transmission electron microscopy characterizations indicated that CTAB-modified TiO 2 with the optimum ratio had the most apparent dispersibility and the highest specific surface area compared with unmodified TiO 2 , SDBS-modified TiO 2 , and PEG-modified TiO 2. At the same time, the photocatalytic degradation rate of methyl orange could be improved to 99.16%. It indicated that the modification effect of CTAB was significantly better than those of SDBS and PEG, which made the nanoparticles uniformly dispersed, resulting in higher photocatalytic activity.

Quantum dot-modified titanium dioxide nanoparticles as an energy-band tunable electron-transporting layer for open air-fabricated planar perovskite solar cells

“…The characteristic peak positions at 25.3 (101), 37.6 (004), 47.9 (200), 54.7 (105), 62.7 (204), and 75.1 (215) appeared in all samples, corresponding to the anatase-TiO 2 phase. 42,43,44 The expected characteristic peak of CdS was not found in all different conditions because of the high dispersion with the quantum size effect of CdS QDs. 40,45 Nevertheless, the main diffraction peaks of TiO 2 presented slight shifts to lower 2 θ positions for CdS-modified TiO 2 .…”

Synthesis of Monolithic TiO2 Aerogels With Relatively Low Shrinkage and Improved Formability Assisted by CTAB

“…The presence of peak at 1,047 cm −1 was possibly due to the adsorbed water molecules. The characteristic absorption peak of CO 2− 3 appears at 1,385 cm −1 , which indicated that CO 2 adsorbed on the surface of TiO 2 reacted with H 2 O to form CO 2− 3 (Bezrodna et al, 2004;Wu et al, 2018). The band at 900-500 cm −1 was attributed to the vibrations of Ti−O−Ti bonds (Wen and Zhang, 2016;Feizpour et al, 2019;Jnido et al, 2019).…”

“…As a surfactant, cetyltrimethylammonium bromide (CTAB) has a perfect poreforming effect and could play the role of framework support. There have been many studies on the addition of CTAB to improve the performance of TiO 2 gel since it can effectively increase the specific surface area (Zhong et al, 2013;Wu et al, 2018;Dong et al, 2020). However, TiO 2 aerogel requires subsequent heat treatment to improve its crystallinity (Baia et al, 2006), which removes CTAB (Nadrah et al, 2017) and causes a severe collapse of the pore structure and limits the improvement of photocatalytic performance.…”

Photocatalytic Efficiency of Metallo Phthalocyanine Sensitized TiO2 (MPc/TiO2) Nanocomposites for Cr(VI) and Antibiotic Amoxicillin

“…In order to generate sensitized or non-sensitized TiO 2 composites, especially with mesoporous structures, surfactant materials were used in the literature. They are Tween-20 [41], Tween-80 [42], polyethylene glycol [43,44], Brij-58 [45], Triton X-100, Pluronic F-127/P-123 [40][41][42][43][44][45][46], Acetyl trimethyl ammonium bromide (CTAB) [43][44][45][46][47], and Laurylamine hydrochloride [48,49].…”