Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China.
Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China.
Environ Res. 2022 May 1;207:112176. doi: 10.1016/j.envres.2021.112176. Epub 2021 Oct 9.
In recent decades, sodium percarbonate (SPC) has been widely applied as a solid replacement for HO in advanced oxidation process (AOPs). In this study, ultraviolet (UV) light was utilized for SPC activation to investigate the aniline degradation performance. The effects of SPC dosages and UV irradiation on aniline degradation were elaborated. The removal efficiency was significantly improved by increasing either the SPC dosage or UV irradiation intensity. Moreover, scavenging experiments showed that •OH, CO, and O were the predominant reactive species for aniline degradation. Meanwhile, the variation in the amount of •OH in the UV/SPC system was monitored, which revealed the dominant role of •OH. As a result, the mechanism of aniline degradation by the UV/SPC system was demonstrated based on confirmed free radicals. Furthermore, aniline degradation by the UV/HO and UV/HO/NaCO system were compared with the UV/SPC system, and an enhancement by the addition of Fe(II) in the UV/SPC system was verified. Aniline degradation was not significantly affected by the initial pH or the presence of Cl, SO while NO, HCO and humid acid (HA) suppressed the reaction. In general, the UV/SPC system is a novel, green, and promising technology for aniline removal from aqueous solutions.
在最近几十年中，过碳酸钠（SPC）已被广泛用作高级氧化工艺（AOPs）中 HO 的固体替代品。本研究利用紫外光（UV）激活过碳酸钠以研究其对苯胺的降解性能。阐述了过碳酸钠剂量和 UV 辐照对苯胺降解的影响。通过增加过碳酸钠剂量或 UV 辐照强度，去除效率得到显著提高。此外，清除实验表明•OH、CO 和 O 是苯胺降解的主要反应性物质。同时，监测了 UV/SPC 体系中•OH 的数量变化，揭示了•OH 的主导作用。因此，基于确认的自由基，阐述了 UV/SPC 体系降解苯胺的机制。此外，还比较了 UV/HO 和 UV/HO/NaCO 体系对苯胺的降解作用，并验证了在 UV/SPC 体系中添加 Fe(II)的增强作用。初始 pH 值或 Cl、SO 的存在对苯胺降解没有显著影响，而 NO、HCO 和湿酸（HA）抑制了反应。总的来说，UV/SPC 体系是一种新颖、绿色且有前途的技术，可用于从水溶液中去除苯胺。
