Decolorization of Methylene Blue in an Ar Non-Thermal Plasma Reactor

Abstract

The decolorization of methylene blue (MB) dye wastewater was performed via atmospheric Ar non-thermal plasma (Ar-NTP). Investigations were carried out into two main aspects of the model; hydrogen peroxide (H2O2) production and the decolorization of MB by Ar-NTP. It was found that H2O2 could be obtained better at a lower pH and with a higher Ar gas flow rate and plasma power. The decolorization rate constant of MB decreased with the increase in the solution pH, and it was found to follow a pseudo-first-order reaction. The optimum experimental conditions in this paper for the decolorization of a 5 ppm initial MB concentration were: 20.35 W plasma power, 4 LPM Ar gas flow rate, and pH 5, together with the addition of 920 ppm Fe2+. The decorization rate constant was 83.7×10-3 min-1, which was 9.73 times greater than that without the addition of Fe2+ under the same experimental conditions.

Influence of Multi‐Pin Anode Arrangement on Electric Field Distribution Characteristics and Its Application on Microgreen Seed Treatment

“…[6] The plasma treatment on wastewater from industrial has OH À , H 2 O 2 , and sulfate (SO 4 2À ). [19] Therefore, the choice of PAW application depends on the chemical compounds that are necessary for that work. Currently, many types of research have studied PAW with various applications, such as the microorganism deactivation, [5] the degradation of organic compounds, [20] the wastewater purification, [19] the agricultural improvement, [18] and other ones.…”