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%.
Highlights
Named because molecules of acid groups are found in their chemical structure
This paper reports on a corona plasma at atmospheric pressure, formed at the liquid-air interface, to treat water samples contaminated with textile dyes, with the aim for improving their quality by the application of this physical-chemical process
They can be classified, in general, as either thermal and non-thermal. Their ionization grade determines if they can be described as cold plasmas with an ionization percentage less than 10%, or hot plasmas with an ionization percentage greater than 10%
Summary
Named because molecules of acid groups are found in their chemical structure. These dyes are soluble in water and are generally applied to wool, nylon, and acrylic fibers, in addition to the dyeing of skin and paper. This paper reports on a corona plasma at atmospheric pressure, formed at the liquid-air interface, to treat water samples contaminated with textile dyes, with the aim for improving their quality by the application of this physical-chemical process. They can be classified, in general, as either thermal and non-thermal. It comprises two tungsten electrodes: a high voltage electrode (anode, 12) placed above the surface of the liquid and a ground electrode (cathode, 14) that is immersed in water; the electrodes are perpendicularly aligned. To condense the evaporated water, a condenser (3) is placed above the system
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