Sonophotocatalytic degradation of poly (vinyl pyrrolidone) (PVP) in the presence of TiO2 nanoparticles

Authors

Department of Chemical Engineering, Islamic Azad University-Ahar Branch, Ahar, Iran

Abstract

The degradation of poly (vinyl pyrrolidone) (PVP) by means of ultrasound irradiation and its
combination with heterogenous photocatalysis (TiO2 nanoparticles) was investigated. Emphasis
was given on the effect of additive on degradation rate constants. 24 kHz of ultrasound
irradiation was provided by a sonicator, while an ultraviolet source of 30 W was used for UV
irradiation. To increase the efficiency of degradation process, degradation system was combined
with TiO2 nanoparticles (0.1-0.6 g L-1) in the presence of UV irradiation. Sonophotocatalytic
process led to complete PVP degradation in 150 min with the rate increasing with increasing
catalyst loading. Sonophotocatalysis in the presence of nanoparticles was always faster than the
respective individual processes. A synergistic effect between ultrasound and ultraviolet
irradiation in the presence of TiO2 nanoparticles was suggested. The average molecular weight
of ultrasonicated PVPs was determined by measurements of intrinsic viscosity of samples.

Keywords


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