Solar photocatalytic degradation of phenol was performed using TiO2 films deposited inside glass tubing by a spray-gel technique. Photocatalytic phenol degradation experiments were performed using either solar radiation or a 300W lamp simulating the UVA solar radiation component. In order to concentrate the radiation a reflective surface was placed in the rear part of the tube. The obtained TiO2 films were amorphous, but after annealing at 450°C for 1h, the films crystallized to the anatase structure and presented photocatalytic activity. The films’ morphology, observed by scanning electron microscopy, presented a uniform film and agglomerates of TiO2. The size of the agglomerates increases as Ti isopropoxide/ethanol molar ratio of the starting solution increases. The concentration of the precursor solution and the film thickness of TiO2 was optimized for phenol degradation. The TiO2 film obtained with a Ti-isopropoxide/ethanol molar ratio of 0.0259 and a film thickness between 1.2to2.4μm were shown to yield the highest phenol degradation.
Spectral Optical Readout of Rectangular–Miniature Hollow Glass Tubing for Refractive Index Sensing
