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Selective decontamination of textile thiazine dyes by sulfite promotion: Reaction kinetics and activation mechanism
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-04-17 , DOI: 10.1016/j.seppur.2024.127552 Peng Zhang , Yang Sun , Xiao Wang , Zhen Zhang , Xiaodi Duan , Liang Tang
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2024-04-17 , DOI: 10.1016/j.seppur.2024.127552 Peng Zhang , Yang Sun , Xiao Wang , Zhen Zhang , Xiaodi Duan , Liang Tang
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Sulfite-based advanced reduction processes have been extensively studied as a purposeful option of wastewater treatment, while their direct chain reaction mechanisms involved reductive destruction of textile dye are still unclear. Here, we reported that sulfite source can selectively destructed cationic dyes of thiazines without photoenergy and catalysts activation in neutral pH. The series of electrochemical experiments (e.g., galvanic oxidation, chronoamperometry measurements and cyclic voltammograms) showed that sulfite attacks phenazine dye of methylene blue via electrons transfer to form the primary electron-donor radical cation species of sulfite radical, followed by the auto-catalytic decontamination concurrently with hydrated electrons and oxysulfur species from radical chain reactions under aerobic conditions. Based on radical quenching and electron paramagnetic resonance, the underlying mechanism of reaction kinetics and activation pathway can be expanded to other common thiazine dyes (Azure II, Azure A and thionine) and even capable for removing co-existing azo dye of methyl orange and their raw production material of aniline in textile effluents. The selective bimolecular collisions system between thiazine and sulfite triggered the spontaneous radical formation without clear deactivation and water matrix affect, which is furthered to provide new ideas for hybrid treatment construction with respect to sustainable management of textile dye wastewater at industrial applications prospect.
更新日期：2024-04-17
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