Preparation and Characterization of Thin Films TiO₂ Prepared by Various Amount of Triton X-100 Surfactant for Photodegradation of a Dye Pollutant

Abstract:

Dipping borosilicate glass in modified sol-gel solution was used to prepare thin film TiO₂. The sol was prepared from titaniumtetraisopropoxide(TTIP), hydrochloric acid (conc. HCl), ethanol(EtOH), TritonX-100 surfactant and acetic acid(AcOH). The mole ratios of the starting solution were surfactant: EtOH: AcOH: TTIP: conc.HCl= R: 45: 6: 1: 0.1. The amounts of surfactant (R value) were varied as 0, 0.5, 1, 2, 3 and 4 moles, respectively. After dip-coated, the borosilicate glasses were dried at room temperature and heated for 15 minutes at 500 ^°C (rate3^°C/min). The obtained films were uniform; however, varied in transparency, decreasing when the TritonX-100/TTIP mole ratios had been increased. The crystal structure, optical property and the morphology of thin films TiO₂ were characterized by X-ray diffraction (XRD), UV–Vis spectroscopy, Environment Scanning Electron Microscope (E-SEM) and Atomic Force Microscopy (AFM). Spectra of XRD showed that all the TiO₂ thin films were anatase phase. From UV–Vis technique, it was found that their UV absorption edges were approximately 380 nm. A cracking on the surface of TiO₂ thin films appeared when the amounts of the surfactant were increased. From AFM image, TiO₂ particles were spherical size, ranged from 11.2 to 35.5 nm and the roughness of the films increased with the increasing of TritonX-100/TTIP mole ratios. Under UV illumination, the photodegradation results of Reactive Yellow17 was pseudo the first order reaction and the film of TritonX-100/TTIP mole ratio = 1 : 1 was the highest removal efficiency with the apparent rate constant (k) = 2x10^-2 min^-1 and half life (t_1/2) = 34.65 min.

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 2863-2870
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.2863
• Online since: May 2011
• Authors: Sudjit Sanguanruang, Rachan Leotphayakkarat, Nitikarn Fangern, Nattamon Koonsaeng, Chamorn Chawengkijwanich
• Keywords: Nanocrystalline Thin Film TiO₂, Photocatalyst, Reactive Yellow17, Triton X-100

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