Imidazolium-Based Ionic Liquids in Water: Assessment of Photocatalytic and Photochemical Transformation

被引：25
作者：
Calza, Paola [1 ]
Vione, Davide [1 ]
Fabbri, Debora [1 ]
Aigotti, Riccardo [2 ]
Medana, Claudio [2 ]
机构：
[1] Univ Turin, Dept Chem, I-10125 Turin, Italy
[2] Univ Turin, Dept Mol Biotechnol & Hlth Sci, I-10125 Turin, Italy
来源：
ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2015年 / 49卷 / 18期
关键词：
SURFACE WATERS; ORGANIC-MATTER; PHENYLUREA HERBICIDES; LABORATORY MEASURES; HYDROXYL RADICALS; RIVER WATERS; TOXICITY; FATE; DESIGN;
D O I：
10.1021/acs.est.5b02738
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The photoinduced transformation of two ionic liquids, 1-methylimidazolium hydrogensulfate (HMIM) and 1-ethyl-3-methyl-imidazolium hydrogensulfate (EMIM), was investigated under photocatalytic conditions in the presence of irradiated TiO2. We monitored substrate disappearance, transformation products (TPs), degree of mineralization, and toxicity of the irradiated systems. Acute toxicity measures suggested in both cases the occurrence of more toxic TPs than the parent molecules. A total of five TPs were detected by HPLC-HRMS from HMIM and nine from EMIM. Complete mineralization and stoichiometric release of nitrogen was achieved for both compounds within 4 h of irradiation. The photochemical transformation kinetics and pathways in surface waters (direct photolysis and indirect photoreactions) were studied for EMIM, to assess its persistence in sunlit water bodies such as rivers or lakes. Environmental phototransformation would be dominated by direct photolysis, with half-life times of up to one month under fine-weather conditions.
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收藏
页码：10951 / 10958
页数：8
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