TiO₂ Photocatalytic Degradation of Methylene Blue Using Simple Spray Method

Abstract

The present work focused on the effects of TiO2 in degrading organic wastewater. Technical TiO2 of anatase crystalline phase was used. TiO2 photocatalyst showed a powerful result in destroying organic effluent. Spray coating was conducted to immobilize the TiO2 particles onto the plastic buffer followed with heat-treatment process. As a result, 30 mL of 25 mg L−1 methylene blue (MB) used in the photocatalyst test was sucessfully degraded after 4 hours of irradiation. Repetitive use of the TiO2 films still has a great photodecomposition ability of removing 99% of the organic contaminant after 5 times use.

The effect of TiO2 photocatalyst towards methylene blue degradation using simple dip coating

“…Line C and D show reduction in MB concentration due to the photocatalytic process of TiO2 catalysts. The catalytic degradation process in lines C and D is activated when a photon with higher energy than the MB band gap hits the surface, leaving a hole in the valence band [3,[6][7][8][9][10]. We find that both curves follow the pseudo-first-order decay kinetics with the irradiation time.…”

“…2). The catalytic degradation process in lines C and D is activated when a photon with higher energy than the MB band gap hits the surface, leaving a hole in the valence band [3,[6][7][8][9][10]. The fundamental principle of photocatalysis is illustrated in Figure 3.…”

“…Photocatalysts are important processes that provide a relatively simple means for converting solar energy, which is used in oxidation and reduction processes. There are myriad uses of photocatalysis: water and air purification, odor control, bacterial inactivation, inactivation of cancer cells, and many others [3][4][5][6][7][8][9]. Additionally, photocatalysis has been recognized as an environmentally safe method by providing breakthroughs that address environmental issues.…”

“…Various materials are frequently employed for photocatalysis, such as Fe2O3, TiO2, V2O5, ZnO, CeO2, WO3 and ZrO2. Among these materials, TiO2 is greatly recommended for photocatalyst utilizations due to beneficial properties, such as photostability, high reduction-oxidation performance, high chemical stability, no secondary product (benign environmentally), low cost, and remains stable after a reusable photocatalytic application [7]. In addition, the technical anatase TiO2 is also commonly used as photon absorbing material in solar cells [18,19].…”

Development and Upscaling of SiO2@TiO2 Core-Shell Nanoparticles for Methylene Blue Removal

“…In this photocatalytic study, the pure SiO 2 , TiO 2 nanoparticles, and an MB solution were used as references for comparison. After the UV light exposure, the samples were filtered and the total concentration of the MB was determined from the maximum absorption measurements using UV/Vis spectroscopy, as the characteristic peak of the MB dye at 663 nm is typically used to study its catalytic degradation [ 53 ].…”