Aromatic amines (AAs), ubiquitous in industrial applications, pose significant environmental hazards due to their resistance to conventional wastewater treatments. Peracetic acid (PAA)-based advanced oxidation processes (AOPs) have been proposed as effective strategies for addressing persistent AA contaminants. While the organic radicals generated in these systems are believed to be selective and highly oxidative, acetate residue complicates the evaluation of AA removal efficiency. In this work, we explored transformation pathways of AAs in a representative Co(II)-catalyzed PAA system, revealing five side reactions (i.e. nitrosation, nitration, coupling, dimerization, and acetylation) that yield 17 predominantly stable and toxic by-products. The dominant reactive species was demonstrated as Co–OOC(O)CH3, which hardly facilitated ring-opening reactions. Our findings highlight the potential risks associated with PAA-based AOPs for AA degradation and provide insights into selecting suitable catalytic systems aimed at efficient and by-product-free degradation of pollutants containing aromatic –NH2.
Yuying Zhu,Baoqiang Chang,Xue Sun,Haijian Luo,Wenhui Wang,Chaolin Li
The presence of venlafaxine, one of the popular antidepressants, in environmental aquatic media has become a rising issue and potential threat to global ecology and human health. However, advanced technologies for efficient venlafaxine degradation remain underdeveloped. Herein, we propose to use chloride-mediated electrochemical degradation to efficiently remove venlafaxine in aqueous media. The degradation rate of venlafaxine can be significantly increased when Cl − is added to the conventional electrochemical degradation process. It is found the Cl − can convert to Cl ⋅ , which selectively attacks benzene ring and accelerates its opening, thus leading to the improved degradation and mineralization performance of venlafaxine. Based on the analysis of reactive species and degradation intermediates, the degradation pathways with and without Cl − were proposed. Toxicity test demonstrates that the toxic oxidation products formed during venlafaxine degradation could be completely mineralized in the chloride-mediated electrochemical degradation process. This work demonstrates the chloride-mediated advanced oxidation technology may be a promising way to degrade venlafaxine, which may also apply to other emerging antidepressants contained benzene ring, thus paving a new route for the removal of organic pollutants.
危险品化学品经营许可证（带存储）