The application of thermally activated persulfate for degradation of Acid Blue 92 in aqueous solution

Abstract

Thermally activated persulfate (TAP) was applied for the degradation of Acid Blue 92 (AB92) dye in its aqueous solution. The effects of pH (3-11), temperature (298-333 K), contact time (15-75 min), sodium persulfate (SPS) concentration (0.05-0.5 mM) and initial AB92 concentration (50-400 mg/L) on the degradation of AB92 using TAP were examined. The initial and residual AB92 concentrations were determined spectrophotometrically at the wavelength of 260 nm and the dye mineralization was examined via the total organic carbon analysis. In addition, the chemical oxygen demand was also measured. The activation energy (E a) of AB92 degradation was calculated as 17.38 kJ mol −1 based on the Arrhenius equation. Maximum degradation efficiency of 86.47% was reached after 75 min of treatment at a pH of 5, AB92 concentration of 200 mg/L, SPS concentration of 0.5 mM and temperature of 333 K. The degradation efficiency declined with the addition of different sodium chloride concentrations and organic radical scavengers. AB92 degradation was reduced from 86.5 to 74%, 65, and 59.1% using ethylenediaminetetraacetic acid, tert-butanol, and ethanol, respectively. A kinetic model was also developed to estimate the pseudo-first-order constants as a function of the main operational parameters (initial dye concentration and TAP concentration). Decolorization rate constants (k) of 0.0009, 0.001, 0.0012, 0.0014, and 0.0018 min −1 were obtained at 303, 308, 313, 328, and 333 K, respectively, using the Langmuir-Hinshelwood kinetic model. The results obtained indicate that the TAP degradation process has great potential for the reduction of azo dyes in aqueous environments.

New Sustainable Approach for the Production of Fe3O4/Graphene Oxide-Activated Persulfate System for Dye Removal in Real Wastewater

“…A recent report suggested that the degradation efficiency of acid orange G (AOG) decreased with increased AOG concentration when activating peroxymonosulfate using a Co-Mn-layered double hydroxide [33]. It was also found that the degradation performance of Acid Blue 92 was inhibited at higher dye concentrations when using the thermally activated persulfate process [34].…”

Modeling of adsorption of Methylene Blue dye on Ho-CaWO4 nanoparticles using Response Surface Methodology (RSM) and Artificial Neural Network (ANN) techniques

“…Several treatment methods have been proposed for the removal of dyes from contaminated waters which include photodecomposition, electrolysis, adsorption, oxidation, biodegradation and coagulation–flocculation [[7], [8], [9], [10], [11], [12]]. Amongst the different physical and chemical treatment processes, adsorption is an effective technique which is successfully used for the removal of colors from wastewaters [7].…”

Evaluating the efficiency of advanced oxidation processes for textile wastewater treatment: Electro‐kinetic, sonochemical and persulfate

“…Although during these two reactions, the hydroxyl radical is produced but the presence of sulfate anion as a radical scavenger results in decrease of hydroxyl or sulfate radical activity. Studies were showed that process efficiency were decreased with increasing the pH of solution 21,22 …”

“…So, this study was followed the pseudo‐first‐order kinetic model. Previous study, 20,22,26,43 were reported that treatment of textile wastewater followed the pseudo‐first‐order kinetics.…”