Photo-Oxidation of Rhodamine-6-G via TiO₂and Au/TiO₂-Bound Polythene Beads

Abstract

It is very important to improve the efficiency of water detoxification techniques. In this study, TiO2or gold-TiO2(Au/TiO2) nanocomposite-bound polythene beads were used for the photo-oxidation of rhodamine 6G (R6G) as a model of water organic pollutants. Simple thermal procedures were employed for anchoring TiO2or Au/TiO2nanocomposites to polythene beads. The results revealed that the synthesized Au/TiO2composites exhibited both considerably higher absorption capability of organic pollutants and better photocatalytic activity for the photo-oxidation of R-6G than pure titania. The better photocatalytic activity of the synthesized Au/TiO2composites film than that of the pure titania film was attributed to high capacity of light absorption intensity and easy diffusion of absorbed pollutants on the absorption sites to photogenerated oxidizing radicals on the photoactive sites.

Effect of the Steam Activation Thermal Treatment on the Microstructure of Continuous TiO2 Fibers

“…Straight lines of ln D against 1/T (Figure 8) are plotted according to (7). The activation energies at 500 • C∼700 • C and 700 • C∼800 • C were 38.62 kJ/mol and 143.91 kJ/mol, respectively.…”

“…Controlling the morphological properties of materials during synthesis is of great importance, as these structural characteristics strongly influence their performances and purposes. In order to maximize its performance, much effort has been dedicated to designing and controlling the morphology of TiO 2 from the macroscopic to the nanometer scale [6][7][8], such as nanorods, nanoflowers, nanotubes, nanofibers, and hollow spheres. However, it is still facing challenge during the application of these materials in wastewater disposal due to difficult separation from solution because of their microsize [9].…”

Degradation of methyl orange by TiO2/polymeric film photocatalyst

“…Rhodamine-6-G photooxidation was studied using TiO 2 or gold-TiO 2 nanocompositebound polythene beads. [12] Photocatalytic degradation of MeO in aqueous TiO 2 had been carried out under different irradiation sources, showing better decolourization under solar than UV source. [13] These processes involving suspended catalyst particles have several disadvantages due to expensive and time consuming aftertreatment separation of sub-micron size particles using different filtration processes, which reduce the economic viability.…”

Annealing Effects on Photocatalytic Activity of Zn0.2Cd0.8S Films Prepared by Chemical Bath Deposition

“…Among the various semiconductors for photocatalysis, TiO 2 is undoubtedly the most widely used photocatalyst. However, the wide band gap and rapid electron-hole recombination of TiO 2 largely limits its application as a photocatalyst [4][5][6]. In order to utilize the abundant solar energy, the development of visible light active photocatalysts with high activities under visible light irradiation is of great importance.…”