Plasma treatment by gliding arc discharge of dyes/dye mixtures in the presence of inorganic salts

Abstract

The gliding arc discharge plasma (GAD) technique was used for discoloration and degradation of an anthraquinone dye Alizarin red S (ARS), an azo dye Orange G (OG) and their mixture. The influence of chloride and sulfate salts on the efficiency of treatment has also been studied. The aim of this study is the discoloration and degradation by GAD of ARS, and OG and their mixture.The GAD plasma generated between two moist air metallic electrodes connected to a high voltage produced chemical species and highly reactive molecules Å OH, NO Å , O Å , O 2 , HO 2 Å , H Å , H 2 O 2 , O 3 . . . and other excited-state neutral molecules. The reactions of discoloration for ARS and OG followed pseudo-first-order kinetics. The apparent kinetic constants of bleaching were found equal to 0.014 and 0.013 min À1 and degradation of 0.008 and 0.010 min À1 , respectively for the ARS and OG. For mixtures, the rate of discoloration was 80% in 120 min of treatment for mixtures III, IV and V, while the rate of COD reduction was fast in the first 30 min since it varied between 35% and 40% for all mixtures but stabilized at 68% toward the end of the treatment. The addition of chloride salts and sulfate showed a decrease in the effectiveness of treatment.

Plasma jet for environmental applications: Computational study of the electric field distribution between electrodes

“…In these situations Gliding Arc discharges seems to be suitable alternative providing similar advantages as the microwave plasma, moreover with lower costs for the acquisition of the equipment. Gliding Arc discharges are being recently utilized for decontamination of water and air [1,2], degradation of various compounds [3][4][5][6] modification of surface properties of solid materials [7][8][9] or production of hydrogen [10]. The large number of applications of gliding arc is possible due to the nonequilibrium character of this kind of plasma discharge, which consequently enables to produce relatively high number of charged and highly reactive particles.…”

Solution Plasma-Assisted Green Synthesis of MnO2Adsorbent and Removal of Cationic Pollutant

“…Furthermore, the SP was utilized as an assistant for decomposition of organic pollutants. Recently, plasmaassisted water treatments, including thermal/nonthermal plasma, microwave plasma, or arc plasma [21][22][23], have been demonstrated to be the effective way for remediation of waste water. Plasma-based techniques could oxidize and decompose the toxic organic molecules to less toxic or nontoxic small by-products.…”

Catalytic/inhibitory effect of the joint presence of two dyes on its destruction by underwater plasma processes: a tool for optimization parameters of treatment

“…At present, there are some references regarding the application of nonthermal plasmas to a mixture of the organic dyes [39][40][41][42]. In [42], it was found that the destruction of two dyes occurs faster in their mixture than in the solutions, which contain only one dye. It was assumed that the dyes in a mixture or its byproducts could be a catalyst in the degradation process.…”