Threatening environmental resources such as water, air and soil, and thus indirectly threatening biodiversity, through rapid, uncontrolled and non-ecological industrial production systems must be prevented through appropriate purification methods. In this research, the sorption of Reactive blue 19 anthraquinone dye from aqueous solution was carried out in a batch system using nano zinc–manganese ferrite carbonate (ZnMn–Fe₂O₄–CO₃) synthesized by the co-precipitation method. Various factors affecting the sorption activity of the material were examined, and the most suitable conditions were determined to be pH 2 and ZnMn–Fe₂O₄–CO₃ concentration of 0.25 g/L, whereby an equilibrium sorption capacity of 1463.10 mg/g was achieved. The ZnMn–Fe₂O₄–CO₃ removal efficiency was found to be 88.48% in effluent from a textile manufacturing industry. Utilizing FTIR, SEM, EDS, XRD, TGA and BET methods, the material’s morphological and structural characteristics were thoroughly investigated and reported. Regarding the kinetic and isotherm models that were analyzed, the Langmuir and pseudo-second-order (PSO) models provided the best fit to the aforementioned sorption system. Thermodynamic data confirmed the spontaneity of the sorption reaction and the exothermic nature of the process. An extensive study of ZnMn–Fe₂O₄–CO₃ demonstrated its high efficiency in removing RB19 dye, as well as the safety and simplicity of the synthesis, the cost-effectiveness of the sorption process, and the possibility of regeneration and reuse over multiple cycles. These findings highlight the potential of ZnMn–Fe₂O₄–CO₃ for advanced water and wastewater purification technologies targeting anthraquinone dyes.

A self-made pulsating atmospheric-pressure corona plasma reactor was tested for the degradation of textile dye Reactive Blue 4. The reactor generated a corona-type discharge in air with low-intensity streamers, without sparks. The effect of the initial dye concentration, input reactor voltage, and pH was examined using model dye water solutions. A 50 mg dm-3 dye solution was completely decolorized at 18 kV and its native pH of 6.8 in less than 40 minutes. The chemical oxygen demand (COD) was reduced by 82% and 85% after 120 and 180 minutes of treatment, respectively. Decolorization rate and efficiency decreased with increasing initial dye concentration and with decreasing input voltage. Decolorization proceeded slightly faster in acid-neutral media than in alkaline media. The major degrading agent was determined to be the hydroxyl radical, generated by plasma. Textile effluent, containing 56 mg dm-3 RB 4, sulphates and carbonates, with pH 11.8, after removing the dyed fabric, was completely decolorized in 85 minutes, and the COD was reduced by about 76% and 78% after 120 and 180 minutes of treatment, respectively, which demonstrated the high potential of the reactor.

ZnO was synthesized by potentiostatic electrodeposition, characterize by XRD, SEM and EDX, and used as a catalyst for degradation of Reactive Blue 19 (RB 19) dye by non-thermal atmospheric pressure corona plasma discharge. The principle of degradation and the role of the catalyst were presented. ZnO improved the degradation rate by 2.35 times by enhancing decomposition of plasma-generated H2O2 into ⋅OH radical, which was found to be a major degradation reagent.