Degradation of Reactive Blue 19 (RB19) by a Green Process Based on Peroxymonocarbonate Oxidation System

Abstract

The effectiveness of peroxymonocarbonate ( HCO 4 − ) on the degradation of Reactive Blue 19 (RB19) textile dye was investigated in this study. The formation kinetics of HCO 4 − produced in situ in a H 2 O 2 − HCO 3 − system was studied to control the experimental conditions for the investigation of RB19 degradation at mild conditions. The effects of metallic ion catalysts, the pH, the input HCO 3 − and Co2+ concentrations, and UV irradiation were studied. The obtained result showed that Co2+ ion gave the highest efficiency on accelerating the rate of RB19 degradation by the H2O2– HCO 3 − system. In the pH range of 7–10, the higher pH values resulted in faster dye degradation. The reaction orders of the RB19 degradation with respect to Co2+ and HCO3– were determined to be 1.2 and 1.7, respectively. The UV irradiation remarkably enhanced the radical formation in the oxidation system, which led to high degradation efficiencies. The COD, TOC removal, and HPLC results clearly revealed complete mineralization of RB19 by the H 2 O 2 − HCO 3 − − Co 2 + system.

Study on catalytic activity of Co(II) in Rhodamine B decolorization by peroxymonocarbonate in aqueous solution

“…This trend is consistent with our previous results for the decolorization of Reactive Blue 19 dye. [ 11 ]…”

“…Reaction solutions composed of 8 mg/L RhB, 20 mM H 2 O 2 , 10 mM HCO 3 – and 0.1 mg/L Co(II) were allowed to pass through a UV chamber at a rate of 100 mL/min using a circular pump as described in our previous paper. [ 11 ]…”

“…Meanwhile, the application of hydroxyl radicals is due to the strong oxidation capacity of free radicals formed in‐situ such as • OH, O 2 •‐ , HO 2 • , etc. [ 9 ] To enhance the generation of these radicals in aqueous solutions, thereby speeding up the degradation of organic matters, some techniques have been used in combination with AOPs such as UV irradiation [ 10,11 ] or ultrasound irradiation. [ 7,12,13 ] It is reported that the cavitation phenomenon in sonochemistry results in the formation of primary radicals such as • OH and additional radicals from oxygen present in bubbles.…”

“…Recently, some studies have indicated that peroxymonocarbonate (HCO 4 – ), an active oxidizing agent formed in‐situ by the reaction between H 2 O 2 and NaHCO 3 , exhibits much stronger activity compared to H 2 O 2 . [ 11,15 ] However, the mechanism and factors affecting the decomposition of HCO 4 – to generate free radicals as well as its ability to oxidize organic pollutants are still unclear.…”

Degradation of Anthraquinone dye wastewater by sodium percarbonate with CoO heterogeneous activation

“…For example, Co 2+ activated peroxymonocarbonate degraded 90% of RB19 in the range of 200 min. 23 In addition, the CA/Fe (II)/SPC oxidation system, catalyzed by co-chelators, has been successfully applied to the degradation of phenanthrene. 24 On the other hand, nonhomogeneous catalysis has been employed, such as the previously reported degradation of 95% Trichloroethylene (TCE) using 200 mg L −1 Z-nZVI-Cu activated with 0.1 mmol L −1 SPC.…”