光助-过碳酸钠体系降解2-羟基-4-甲氧基二苯甲酮
Photo-assisted degradation of benzophenone-3 by sodium percarbonate system
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摘要: 有机防晒剂在废水、海水和地表水中经常检出,亟需发展新型高效的去除技术.本研究构建了以过碳酸钠(SPC)代替H2O2的光助均相氧化体系,并选取水体中广泛检出的2-羟基-4-甲氧基二苯甲酮(BP-3)为模型化合物,研究了该体系中的降解动力学和常见溶解性组分的影响.结果表明,相对于单独SPC、单独UV体系,BP-3在SPC+UV体系中呈现更好的降解效率.自由基淬灭和电子自旋共振实验证实·OH是SPC+UV体系中降解BP-3的最主要活性物种.水中常见溶解性组分DOM和Br-可淬灭体系中的·OH进而对BP-3的降解表现为抑制效应;而Cl-在低浓度下促进BP-3降解,高浓度则抑制其降解,这和BP-3与Cl·、Cl2·-的反应活性差异相关.
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关键词:
- UV/Fenton体系 /
- 过碳酸钠 /
- 2-羟基-4-甲氧基二苯甲酮 /
- 羟基自由基 /
- 溶解性组分
Abstract: Organic sunscreen agents were frequently detected in wastewater, seawater, and surface water, which urgently needs to develop a novel and efficient treatment technology for these pollutants in water. In this study, Fenton-like system based on sodium percarbonate (SPC), instead of H2O2, was constructed, and benzophenone-3(BP-3) was selected as a model compound due to its wide detection in water. The degradation kinetics and the effect of main water constituents in this oxidation system were investigated. The results showed that SPC+UV system had better degradation efficiency for BP-3 relative to individual SPC and UV systems. Radical scavenging and electron spin resonance experiments demonstrated that·OH was largely responsible for the degradation of BP-3 in the SPC+UV system. DOM and Br- quenched·OH, which led to the inhibitive effect on the degradation of BP-3. Cl- could promote BP-3 degradation in a relatively low concentrations, and inhibit BP-3 degradation in a relatively high Cl-, which might be relevant to the different reactivity of BP-3 with Cl·and Cl2·-.-
Key words:
- UV/Fenton system /
- sodium percarbonate /
- benzophenone-3 /
- hydroxyl radical /
- dissolved components
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