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- Title
Enhanced treatment of azo dyes in wastewater using heat-activated persulfate with micro-nano bubble aeration.
- Authors
Yang, Yang; Yao, Xue; Wu, Shuhui; Wang, Xiao; Feng, Lei; Feng, Xuedong; Ma, Yanfei
- Abstract
Azo dyes-containing wastewater can lead to environmental issues and pose threats to public health. The efficient degradation of azo dyes with novel and potent techniques, remains a challenge. This study presented an innovative utilization of micro-nano bubble aeration technology to improve the treatment of Rhodamine B through heat-activated persulfate oxidation. Through single factor experiments, the impacts of persulfate concentration, temperature, initial Rhodamine B concentration, and pH values were systematically explored on the degradation of Rhodamine B in heat-activated persulfate oxidation. The removal rate of Rhodamine B was 94.53% optimized by Response surface optimization method. The reaction rate was in the range of 0.0109–0.0528 min−1, governed by pseudo-first-order kinetics. By applying the Arrhenius equation, the activation energy was determined to be 14.06 KJmol−1. Furthermore, properties of micro-nano bubbles and their synergistic coefficient were investigated in heat-activated persulfate oxidation. Quenching tests revealed the predominance of sulfate radicals, and full wavelength scanning facilitated an in-depth investigation of the reaction mechanism. Additionally, a proposed electron shell structure elucidated the decomposition process of Rhodamine B. Therefore, the implementation of micro-nano bubble aeration technology based on heat-activated persulfate oxidation, held the promise as an efficient and effective approach for the treatment of printing and dyeing wastewater. • The synergistic coefficient of Micro-nano bubble aeration in heat-activated persulfate oxidation was calculated. • The Rh B degradation in heat-activated persulfate oxidation fitted well with the pseudo-first-order reaction model. • Response surface methodology was used to optimize the reaction condition. • •OH and SO 4 •- are the active species involved in Rh B degradation and SO 4 •- dominated. • The electron shell structure of micro-nano bubbles was proposed in Rh B degradation.
- Subjects
AZO dyes; RHODAMINE B; SEWAGE; RESPONSE surfaces (Statistics); ACTIVATION energy; DISSOLVED air flotation (Water purification)
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2023, Vol 197, p24
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2023.07.013