Bleaching and Degradation of Textile Dyes by Nonthermal Plasma Process at Atmospheric Pressure

Abstract

The degradation of aqueous solutions of various dyes (e.g., Orange I, Crystal Violet, and Eriochrome Black T) used for the textile industry was performed by means of a special nonthermal quenched plasma technique (i.e., the gliding arc technique, which results from an electric discharge at atmospheric pressure and ambient temperature). The gaseous species formed in the discharge, and especially the OH radicals, induce strong oxidizing effects in the target solution, so that bleaching of the solution and degradation of the solute result, as evidenced by absorbance and chemical oxygen demand (COD) measurements. The two processes were considered as matching reactions, and overall kinetic data were derived when possible. A tentative mechanism based on literature data is also presented.

Gliding arc discharge-assisted biodegradation of crystal violet in solution with Aeromonas hydrophila strain

“…5) Iya-Sou et al 2011;Merouani et al 2013). These trends are similar to those obtained by Abdelmalek et al (2006). Plasma decolorization is due to the cleavage of the -C=C-and -N=C-chromophore groups of the CV molecule, while degradation requires the cleavage of chromophore groups but also the opening of the aromatic rings and grafting of nitrogen containing groups provided by ONOO - Naïtali et al 2012).…”

“…Bleaching and degradation of CV by direct exposure to a continuous discharge Direct exposure of the CV solution to the glidarc discharge for time t* (i.e., continuous discharge) was investigated previously by Abdelmalek et al (2006) who was a pioneer in the plasma bleaching/degradation of dye-stuff. Figure 5 shows that the initial concentration of CV solution decreased during the plasma treatment.…”

“…Moreover, they are precursors of other active species ). The glidarc technique was successfully tested for the pollutant abatement of aqueous effluents, and several examples relevant to the elimination of dyes found in domestic and industrial wastewaters are reported in the literature: These include TPM dyes such as malachite green, CV, bromothymol blue, and bromophenol blue (Abdelmalek et al 2006;Doubla et al 2008;Djepang et al 2014).…”

Development of non-thermal plasma jet and its potential application for color degradation of organic pollutant in wastewater treatment

“…The textile industry emits a wide variety of pollutants from all stages in the processing of fibers, fabrics and garment production [1]. Environmental pollution by organic dyes contribute a severe ecological matter that is elevated by the fact that most of these dyes are difficult to degrade by traditional techniques [2]. Chemical materials or dyestuffs such as acids, alkalis, surface active substances and salts [3] are the components of organic pollutants in the textile industry's liquid waste that must be treated before being discharged from the factory to the environment.…”

Investigating the Water Sealing Capability of Polymer Concrete

“…Effluents from the textile industry have high concentrations of organic and inorganic dyes which are heavily colored, have a high Chemical Oxygen Demand (COD), fluctuate significantly in pH and are toxic to organisms (Abdelmalek et al, 2006). Common techniques used to remove dyes include chemical, physical and biological processes (Dafnopatidou et al, 2007).…”