UV/Peracetic Acid for Degradation of Pharmaceuticals and Reactive Species Evaluation
UV/Peracetic Acid for Degradation of Pharmaceuticals and Reactive Species Evaluation
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DOI：
10.1021/acs.est.7b04694
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发表时间：
2017-12-19
影响因子：
11.4
通讯作者：
Huang, Ching-Hua
中科院分区：
文献类型：
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作者：
Cai, Meiquan;Sun, Peizhe;Huang, Ching-Hua
过氧乙酸（PAA）是一种广泛使用的消毒剂，并且将UV光与PAA（即，紫外光/聚丙烯酸（UV/PAA）是一种新型的高级氧化工艺。这项研究是第一次评估PAA的光解作用。在UV照射（254 nm）下和通过UV/PAA降解药物。PAA表现出高的量子产率（Phi（254）（nm）= 1.20和2.09 mol-Einstein（-1），分别为中性（PAA（0））和阴离子（PAA（-））物种），并且还表现出对羟基自由基的清除作用（k.（0）（OH/PAA）=（9.33 +/- 0.3）× 10 ~（-8）M ~（-1）.（-）（OH/pAA）=（9.97 +/- 2.3）× 10（9）M-1.s（-1））。这些药物在单独使用FAA时具有持久性，但在UV/PAA下迅速降解。系统地评价了直接光解、羟基自由基和其他自由基对UV/PAA下药物降解的贡献。结果表明，中心点OH是UV/PAA降解卡马西平和布洛芬的主要自由基。而CH 3C（= O）O-中心点和/或CH 3C（=O）O-2中心点对LTV/PAA降解萘普生和2-萘氧乙酸有显著贡献。除了（OH）-O-中心点之外。UV/PAA产生的碳中心自由基对某些萘基化合物具有很强的氧化活性。本研究所获得的新知识将促进UV/PAA作为一种新的水污染物降解策略的进一步研究和开发。
Peracetic acid (PAA) is a widely used disinfectant, and combined UV light with PAA (i.e., UV/PAA) can be a novel advanced oxidation process for elimination of water contaminants. This study is among the first to,evaluate the photolysis of PAA. under UV irradiation (254 nm) and degradation of pharmaceuticals by UV/PAA. PAA exhibited high quantum yields (Phi(254) (nm) = 1.20 and 2.09 mol-Einstein(-1) for the neutral (PAA(0)) and anionic (PAA(-)) species, respectively) and also showed scavenging effects on hydroxyl radicals (k.(0)(OH/PAA) = (9.33 +/- 0.3) X 10(8) M-1.s(-1) and k.(-)(OH/pAA) = (9.97 +/- 2.3) x 10(9) M-1.s(-1)). The pharmaceuticals were persistent with FAA alone but degraded rapidly by UV/PAA. The contributions of direct photolysis, hydroxyl radicals, and other radicals to pharmaceutical degradation under UV/PAA were systematically evaluated. Results revealed that center dot OH was the primary radical responsible for the degradation of carbamazepine and ibuprofen by UV/PAA., whereas CH3C(=-O)O-center dot and/or CH3C(=O)O-2 center dot contributed significantly to the degradation of naproxen and 2-naphthoxyacetic acid by LTV/PAA. in addition to (OH)-O-center dot. The carbon-centered radicals generated from UV/PAA showed strong reactivity to oxidize certain naphthyl compounds. The new knowledge Obtained in this study will facilitate further research and development of UV/PAA as a new degradation strategy for water contaminants.