Physical-chemical characterization of the textile dye Azo Ab52 degradation by corona plasma

Abstract

This work characterizes the degradation of the textile dye azo Acid Black 52 by measuring several physical and chemical parameters. A corona plasma was created at atmospheric pressure and applied on the liquid-air interface of water samples containing the dye. 1.0 mM of ferrous sulfate (FeSO4) was added to 1.0 mM dye solution, for a total volume of 250 mL. For each treatment, a number of parameters were quantified. These were voltage, current, temperature, loss of volume, pH, electrical conductivity, concentration, optical mission spectra, chemical oxygen demand (COD), total organic carbon (TOC), and the removal ratio. Because of the increase in the sample temperature, the volume lost by evaporation was explored. The results show that the efficiency of the dye degradation by plasma is a function of treatment time. Moreover, the reactive concentration of FeSO4 and the exposition time of the plasma were varied at a constant volume, leading to the determination of the concentrations and optimal times. Considering the degradation and removal parameters, at the maximum treated time of 80 min, it found that COD was of 96.36%, TOC of 93.93%, and the removal ratio of 97.47%.

Photocatalytic dye degradation and biological activities of the Fe2O3/Cu2O nanocomposite

“…This analysis is necessary because the disappearance of dye colour alone cannot be used as a measure to determine the complete mineralization of the dyes. [51][52][53][54] Noxious and longlasting reaction intermediates were formed during the photoremoval of the dyes. Simultaneously, it was essential to calculate the degree of degradation of Rhodamine-B (RB) and Janus green (JG) during photo-removal using the Fe 2 O 3 /Cu 2 O photocatalyst.…”

Comparative study of the degradation process of Azo textile dyes AB52 and AB210 in water using a type-Corona electric discharge

“…An experimental system was designed and built to produce a Corona-type electric discharge on liquid samples with organic pollutants, where samples of textile dyes are treated by means of a cold plasma at atmospheric pressure [2,15]. The luminescent discharge is generated with a direct current power supply (HP Mod.…”

“…where C is the concentration measured of dye at a certain time of treatment and C 0 is the initial concentration of the dye; the concentration C was obtained from the calibration curve (C vs. Abs) of each dye, as described in previous studies [15].…”

“…They are used in different industries that produce paint, ceramics, plastic, leather, ink; in addition, in the textile industry, in the dyeing of fibers; which have a high resistance to washing, so that their disposal of wastewater cannot be done by conventional methods, being necessary the use of AOP's. Currently, several AOP's are used as alternatives for the degradation of organic pollutants, for example: ozone (O 3 ), O 3 and hydrogen peroxide (H 2 O 2 ), O 3 and ultraviolet radiation (UV), Fenton (H 2 O 2 + Fe 2+ ), photocatalytic Fenton process (H 2 O 2 + Fe 2+ + UV); H 2 O 2 and UV [14] and cold plasma [15,16]. In the literature there are reported studies on the elimination of organic pollutants, using atmospheric plasma as a degradation method, having an acceptable efficiency compared to other processes [17][18][19][20].…”

Effect on Discoloration by Nonthermal Plasma in Dissolved Textile Dyes: Acid Black 194

“…Different experimental systems have been built according to each specific purpose for each of the plasmas, all showing advantages among them, but most of the reactors are of pulsed corona discharge type, so they were taken as a reference for the determination of the efficiency in the relative energy (Malik et al, 2010). Various authors made efforts to make the technology of the treatment of wastewater have satisfactory results, and the production of plasmas applied to this type of processes has been studied in detail (Ghodbane et al, 2014;Gómez et al, 2017). A catalyst is a substance that changes the activation energy of a reaction, causing an increase in the reaction rate without it being consumed itself.…”