Comparative investigation of argon and argon/oxygen plasma
performance for Perchloroethylene (PCE) removal from aqueous
solution: optimization and kinetic study

Journal of Environmental Health Science and Engineering

Mostafa Karimaei,  Babak Shokri, Mohammad Reza Khani, Kamyar Yaghmaeian, Alireza Mesdaghinia, Ramin Nabizadeh, Amir Hossein Mahvi & Shahrokh Nazmara

Abstract
Purpose: The aim of this study is evaluation of the perchloroethylene degradation from aqueous solutions by non-thermal plasma produced in dielectric barrier discharge reactor in two different scenarios: first plasma generated with 225 cc/min mixture of oxygen and argon flow (12% gas ratio of O2/Ar), and in the second scenario plasma generated with 225 cc/min of pure argon gas. Methods Design studies were performed using response surface methodology and central composite design. All experiments
with the selected levels of independent parameters including the initial concentration of perchloroethylene (5–100 mg/L), voltage
(20–5 kv) and contact time (15–180 s) was implemented, and 29 tests were proposed by using response surface methodology and
central composite design was performed in two experimental scenarios.
Results showed that the Pseudo first-order kinetics coefficient of perchloroethylene degradation in the mixture of oxygen
and argon and pure argon scenario under the optimum conditions were 0.024 and 0.016 S–1 respectively. Results conveyed that in
order to achieve the highest removal efficiency (100%), the values of contact time, perchloroethylene concentration and voltage
variables were predicted 169.55 s, 74.3 mg/l, 18.86 kv respectively in mixture of oxygen and argon scenario and also were
predicted 203 s, 85.22 mg/l, 20.39 kv respectively in pure argon scenario.
Conclusions In the recent study dielectric barrier discharge was an efficient method for perchloroethylene removal with both
oxygen an argon mixture and pure argon as input gas. Both input voltage and reaction time has positive effect on perchloroethylene removal; but initial perchloroethylene concentration has negative effect on perchloroethylene removal. Comparison of two
plasma scenarios with different input gas shown that plasma generated by mixture of oxygen and argon gas was more powerful
and had higher removal efficiency and degradation kinetics than the plasma generated by pure argon gas.