Comparison of furfural degradation by photocatalyst and different photo oxidation methods

UV irradiation technology is suggested as an efficient approach in order to degrade the hazardous organic contaminants. The overall mineralization extent was depended on the type of process, number , the type of oxidants, and their studied processes parameters as well. The study involves comparative investigations in the efficiency of different UV-based processes including: UV, UV/H2O2, UV/H2O2/O2, UV/H2O2/Fe2 +, UV/O2/Fe2 +, O3, UV/O3 and photocatalytic process, for the minimization of furfural as a model of hazardous pollutant in wastewater. Different AOPs were evaluated on the basis of their effectiveness using phenol TOC value decrease. The highest overall mineralization extent, 90%TOC removal after 110 min, was achieved by H2O2/UV as the most suitable process. Photocatalytic degradation was presented by immobilization of TiO2 nano-particles on perlite as a nano-composite catalyst. The experiments were conducted in order to determine the effect of some parameters such as catalyst dosage, temperature, pH, and UV light intensity. In photocatalyst process, catalyst dosage is one of the important kinetic factors.The highest degradation of furfural was observed at 24 gr/lit photocatalyst loading applied. It was concluded that furfural photocatalytic degradation was effectively worked in pH ~ 6. Because of the low activation energy, the overall efficiency of photocatalyst degradation process is usually not very sensitive to temperature. besides, degradation rate was positively affected by UV light intensity.

کلیدواژه ها:

AOPs ، photocatalyst ، photo oxidation ، furfural ، Titanium dioxide (TiO2)