天津市生态环境科学研究院,天津 300191
Tianjin Academy of Eco-Environmental Sciences, Tianjin 300191, China
后,AN的去除率升高了47.82%,但TOC去除率仅提高了9.78%,且会生成2, 4, 6-三氯苯胺等有害的氯代副产物;相反,在中性(pH=7.5)或碱性条件(pH=11.5)下PS自身能够有效矿化AN,AN的去除率分别提高了57.90%和74.96%,此时TOC去除率分别升高了44.98%和67.15%,而Cl
对苯胺去除的贡献率分别为51.36%、11.25%和9.79%。对NaCl/PS体系中的产物进行鉴定,检测到7种中间产物,并在此基础上探讨了PS氧化降解AN的可能途径。以上研究结果有助于更好地理解和优化与PS相关的高级氧化技术在实际应用中的污染控制。
The formation of halogenated disinfection by-products (DBPs) during organic pollutants degradation in advanced oxidation process (AOPs) has raised growing concerns. However, the detailed roles of chlorine ions (Cl
) in pollutant degradation by persulfate (PS) remain controversial so far. Herein, the degradation mechanisms of Cl
on PS at different pH were investigated, and the pathway of reaction process was proposed in the presence/absence of Cl
. The results showed that at acidic condition (pH=2.5), PS could not directly react with AN but could active Cl
to generate HClO. The removal rate of AN increased from 2.95% to 47.82% when 10 mmol·L
was added in PS solution. This process would be helpful to degrade AN, but it cannot completely mineralize AN, and will produce 2, 4, 6-Trichlorobenzenamine and other chlorinated by-products. At neutral (pH=7.5) or alkaline condition (pH=11.5), PS alone can effectively mineralize AN and the impact of Cl
became negligible, the corresponding removal rates of AN increased by 57.90% and 74.96%, of TOC increased by 44.98% and 67.15%, respectively. By adding radical scavengers, we proved that the degradation of AN occurred as a result of reactions initiated by
at alkaline condition, and HO· played the dominant role in the degradation process. When the removal rate of AN was 74.96%, the respective contributions of HO·,
to AN removal were 51.36%, 11.25% and 9.79%, respectively. Based on the analysis of GC-MS, 7 major intermediate products were identified in NaCl/PS systems. Tentative pathways for the degradation of AN were proposed. Our findings may benefit an improved understanding and optimization of PS-associated AOPs for pollution control in real environmental towards high sustainability and ecological security.
.
/NaCl和PS/NaCl对AN去除的影响
/NaCl and PS/NaCl on AN removal efficiency
Effect of pH on AN removal efficiency in NaCl/PS system
Yield of free chlorine at different pH
不同自由基淬灭剂对PS/NaCl去除AN的影响
Effect of various radical scavengers on the AN removal efficiency in PS/NaCl system
Degradation of AN by different reaction system
利用GC/MS对NaCl/PS降解AN的产物分析
Degradation product analysis of AN in the NaCl/PS systems by GC/MS
NaCl /PS降解AN的反应过程路径推断
Proposed degradation pathway of AN in the NaCl/PS system
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