Abstract
The photochemical and sonochemical degradation of aqueous solutions of pyridine, a common refractory pollutant in wastewater effluents, have been investigated by means of ultraviolet (UV), ultrasound (US), UV/H 2 O 2 , and US/H 2 O 2 irradiation processes. The pure photochemical process were demonstrated to be efficient for degradation of low initial concentrations of pyridine (10 ppm). Sonochemical degradation proceeded very slowly, leading to less than 53% of pyridine removal after 200 min. The degradation efficiency was increased with increasing H 2 O 2 concentration; however, the marginal benefit became decreasing with further increasing of H 2 O 2 due to the scavenging effect of excess H 2 O 2 . The kinetics of photochemical and sonochemical degradation of pyridine were found to follow a first-order rate law. A possible degradation pathway for pyridine was also proposed.
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