Kinetic analysis of soil contained pyrene oxidation by a pulsed discharge plasma process

Abstract

A pulsed discharge plasma (PDP) reactor with net anode and net cathode was established for investigating the pyrene degradation in soil under different pulse peak voltage, air flow rate, pyrene content in soil, initial pH value and initial water content of the soil. Pyrene oxidation within the 60 min discharge time was fitting according to the pseudo-first order equation and the corresponding reaction kinetics constants (k values) were calculated. The obtained results show that pyrene oxidation under all the different reaction conditions obeyed the pseudo-first order equation well. Higher pulsed peak voltage and appropriate air flow rate were in favor of the increase of reaction rate of pyrene oxidation. A higher k value could be achieved in the lower initial pyrene content (the value was 100 mg kg −1). The k value of pyrene oxidation in the case of pH=4 was 11.2 times higher than the value obtained under the condition of pH=9, while the initial water content of the soil also has a large effect on the oxidation rate of pyrene due to the effect of PDP.

Degradation of phenol using a combination of granular activated carbon adsorption and bipolar pulse dielectric barrier discharge plasma regeneration

“…Non-thermal plasma (NTP), as a new advanced oxidation technology (AOT) has drawn extensive attention. NTP can generate multiple types of active species, including hydrogen peroxide (H 2 O 2 ), hydroxyl radicals (•OH), ozone (O 3 ), and other chemically reactive radicals [11][12][13], which play an important role in the degradation of organics in water, soil, and the atmosphere [14][15][16]. Furthermore, dielectric barrier discharge (DBD) plasma as one of the most applied NTP technologies, can be stably generated by simple electrode configurations [17].…”

Electric characteristic and cavitation bubble dynamics using underwater pulsed discharge

“…The discharge in and in contact with water has been paid increasing attention in recent years, which can active various interesting physical and chemical phenomena, e.g., ultraviolet radiation, shock wave, extreme heat, strong redox [1][2][3][4][5]. Moreover, discharge underwater can induce the cavitation, which inspires the development of cavitation bubble dynamics with its applications such as environmental protection, ultrasonic therapy, electronic equipment manufacturing, and material surface cleaning [6][7][8][9]. As we know, cavitation bubbles usually can be achieved by three ways, i.e., ultrasound, pulsed laser, and pulsed discharge [10][11][12][13].…”

Strengthening decomposition of oxytetracycline in DBD plasma coupling with Fe-Mn oxide-loaded granular activated carbon

“…Among the different types of NTPs, dielectric barrier discharge (DBD) plasma has been extensively studied since it can be easily and stably generated with a vast array of active substances [10][11][12]. DBD plasma has been applied to treat environmental contaminants in water, air, and soil [13][14][15]. However, energy yield is an important limitation to the application of NTP, and an integrated processes with adsorption and catalysis is a potential solution [16,17].…”