Abstract
Heterogeneous photocatalysis is one of the advanced oxidation processes (AOP’s). These are very used nowadays for their implementation in tertiary water treatment with solar activation, with very good results. In this study, TiO2 porous films were synthesized by sol-gel method. Polyethylene glycol (PEG) 4000 was used as a templating reagent, which is oxidized at a lower temperature than TiO2. This allows the formation of a “skeleton” of porous TiO2 with increased surface area, resulting in higher photocatalytic activity. The film characterization was made with help of FE-SEM microscope, XRD diffractometer and scotch tape test. Finally, the oxidation experiments were performed using methylene blue as a model pollutant and they revealed an increase in the photocatalytic activity of porous films in comparison with the non-porous films.
Highlights
The world situation nowadays demands and immediate solution to problems related with contaminated water
Based on the works of Huang and Morales [7,8], TiO2 porous films were prepared by sol-gel method
The analysis of X-ray diffraction (XRD) data for 2 theta values of 25.5, 27.5 and 37.5 degrees by Scherrer Equation indicates that particles measure 30.94 nm when there is only TiO2 on the films, and average size decreases to 12.40 nm when Polyethylene glycol (PEG)-4000 was added
Summary
The world situation nowadays demands and immediate solution to problems related with contaminated water. The scientific research has focused its attention in this topic and has developed a wide spectrum of processes in the water treatment technologies [1,2]. This works has resulted in implementing different methods on water treatment systems: pre-treatment, and primary, secondary and tertiary treatments. Within the last set of processes, advanced oxidation processes (AOP) are found, like photocatalytic oxidation (PCO)
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