Photocatalytic oxidation of pirimicarb in aqueous slurries containing binary and ternary oxides of zinc and titanium
Photocatalytic oxidation of pirimicarb in aqueous slurries containing binary and ternary oxides of zinc and titanium
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DOI：
10.1016/j.jphotochem.2014.10.014
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发表时间：
2015-02-01
影响因子：
4.3
通讯作者：
Navarro, Simon
中科院分区：
文献类型：
--
作者：
Fenoll, Jose;Garrido, Isabel;Navarro, Simon
研究了氧化锌（ZnO）、二氧化钛（TiO 2）和钛酸锌（Zn 2 TiO 4和ZnTiO 3）在人工光（300-460 nm）照射下对抗蚜威的光催化降解。催化剂的比较表明，二氧化钛是最有效的去除抗蚜威及其转化产物。为了更好地了解这些ZnO-TiO 2辅助抗蚜威光降解的机理细节，通过液相色谱串联质谱（LC-MS 2）和液相色谱飞行时间质谱（LC-TOF/MS）技术鉴定了这些过程的转化产物。提出并讨论了可能的光降解途径。主要步骤包括：2-二甲基氨基的N-脱烷基化形成氨基甲酸酯，氨基甲酸酯部分的脱氨甲酰化，2-二甲基氨基的进一步N-脱烷基化得到羟基嘧啶。(C)© 2014 Elsevier B. V.保留所有权利。
The photocatalytic degradation of pirimicarb in pure water has been studied using zinc oxide (ZnO), titanium dioxide (TiO2) and zinc titanates (Zn2TiO4 and ZnTiO3) under artificial light (300-460 nm) irradiation. Comparison of catalysts showed that TiO2 is the most efficient for the removal of pirimicarb and their transformation products. To obtain a better understanding of the mechanistic details of these ZnO-TiO2-assisted photodegradation of pirimicarb, the transformation products of the processes were identified by liquid chromatography tandem mass spectrometry (LC-MS2) and liquid chromatography time of flight mass spectrometry (LC-TOF/MS) techniques. The probable photodegradation pathways are proposed and discussed. The main steps involved: N-dealkylation of the 2-dimethylamino group to form the carbamate and decarbamoylation of the carbamate moiety with further N-dealkylation of the 2-dimethylamino group to have the hydroxypyrimidines. (C) 2014 Elsevier B.V. All rights reserved.