Kinetics of degradation of perchloroethylene under ultra-sonic irradiation and photooxidation in aqueous solution

Abstract

Sonolysis and photodegradation of various compounds such as chlorinated aliphatic hydrocarbons are the recent advanced oxidation processes. Perchloroethylene (PCE) is one of these compounds mainly used as a solvent and degreaser. In this work, elimination of perchloroethylene in aqueous solution by ultrasonic irradiation and photooxidation by UVC were investigated. Head space gas chromatography with FID detector was used for analyses of PCE. Results showed that PCE could be effectively and rapidly degraded by ultrasonic irradiation, photooxidation by UVC and combination of these methods. The order of studied reactions for degradation PCE has been determined.

Application of the general rate law model to the sonolytic degradation of nonvolatile organic pollutants in aqueous media

“…Thus, it is obvious that the sono-decomposition process does not obey the pseudo-first order rate law and neither can be satisfactorily designated using a rate constant expressed as 1/time [18] , [19] , [20] , [21] , [22] , [23] , [24] , [17] , [25] . Other studies have fitted the sonochemical degradation kinetics by using the pseudo-second order rate law equation [28] , [29] , [30] , [31] , [32] . Contrary to what a pseudo-second order kinetics law would suggest, the initial sonolytic decomposition rate augmented with the initial substrate concentration and then reached a plateau [18] , [19] , [20] , [21] , [22] , [23] , [24] , [17] , [25] , [26] , [27] , [33] .…”

Chemical Quality of the Leading Bottled Water Brands Distributed in Gorgan, Iran

“…Today, many individuals in urban environments prefer bottled water to the tap water supplied by urban water distribution networks due to the natural quality, better taste, and higher quality of bottled water [6]. According to the literature, the development of technology and industry, population growth, wastewater and solid waste production, and growing use of pesticides have led to the entry of organic compounds and heavy metals into water and water pollution [7][8][9][10][11][12][13]. As such, the continuous monitoring of the quality of bottled water products is of utmost importance .…”