Ultraviolet (UV) light-activated persulfate oxidation of sulfamethazine in water
Ultraviolet (UV) light-activated persulfate oxidation of sulfamethazine in water
复制标题
水中磺胺二甲嗪的紫外线 (UV) 光激活过硫酸盐氧化
DOI：
10.1016/j.cej.2012.04.084
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发表时间：
2012-07-01
影响因子：
15.1
通讯作者：
Ma, Yan
中科院分区：
文献类型：
--
作者：
Gao, Yu-qiong;Gao, Nai-yun;Ma, Yan
在不锈钢光反应器中研究了紫外光/过硫酸盐(S2O82-)氧化药用活性化合物磺胺二甲嘧啶(SMT)的反应。在处理过程中，紫外光分解S2O82-活化产生高活性的硫酸盐自由基(SO4中心点-)，在水中分解SMT。与直接光解或过硫酸盐氧化和UV/H_2O_2氧化相比，SO4中心点是一种非常有效的去除水中SMT的试剂。在实验条件下，SMT的降解符合准一级反应模式。降解率受S2O82投加量和溶液pH的影响。通常，高过硫酸盐剂量可以实现高SMT去除。相反，SMT的降解率和矿化度在pH 6.5时最高，矿化程度在pH 11时最高。这种复杂的pH效应可能与不同自由基的总浓度和比例随pH而变化有关。最后，确定了SMT的主要降解产物，并提出了主要的反应途径。这项研究表明，UV/过硫酸盐是控制水中SMT污染的一个可行的选择。(C)2012爱思唯尔B.V.保留所有权利。
Ultraviolet light (UV)/persulfate (S2O82-) oxidation of a pharmaceutically active compound, sulfamethazine (SMT), was studied in a stainless steel photo-reactor. During the treatment, UV photolytic S2O82- activation to produce highly reactive sulfate radicals (SO4 center dot-) to decompose SMT in water. The treatment was advantageous over direct photolysis or persulfate oxidation alone and UV/H2O2 oxidation, suggesting that SO4 center dot- is a very effective agent to remove SMT from water. Under the experimental conditions, the SMT degradation exhibited a pseudo-first-order reaction pattern. The degradation rate was influenced by the S2O82- dose and solution pH. Typically, a high persulfate dose could achieve a high SMT removal. In contrast, both the highest SMT degradation rate and the lowest mineralization degree were observed at pH 6.5, while the highest mineralization extent was accomplished at pH 11. The complex pH effect may be associated with the fact that the total radical concentration and fractions of the different radicals were varied with pH. Finally, the major SMT degradation products were identified, and the primary reaction pathways were proposed. This study demonstrated that UV/persulfate is a viable option for controlling SMT pollution in water. (c) 2012 Elsevier B.V. All rights reserved.