Haloethers are widely used in industry, and the release of these species into the environment is of great concern because of their toxicity and carcinogenicity. The present study deals with the photocatalytic degradation of the haloether, bis(2-chloroethoxy)methane (BCEXM), in the presence of TiO(2) particles and UV-A (lambda=365 nm) radiation. About 99.5% of BCEXM was degraded after UV irradiation for 16h. Factors such as solution pH, TiO(2) dosage, and the presence of anions were found to influence the degradation rate. To obtain a better understanding of the mechanistic details of this TiO(2)-assisted photodegradation of BCEXM with UV irradiation, the intermediates of the processes were separated, identified, and characterized by the solid-phase microextraction (SPME) and gas chromatography/mass spectrometry (GC/MS) technique. To the best of our knowledge, this is the first report on the degradation pathways of BCEXM. The first step in the destruction of BCEXM is thought to be abstraction of a hydrogen by ()OH to form a carbon-centered radical which then reacts with O(2) to form a peroxyl radical. Peroxyl radicals react with one another and produce an alkoxy radical. The beta-bond fragmentation of the alkoxy radical produces different intermediates.

中文翻译：

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TiO2光催化降解双（2-氯乙氧基）甲烷：参数和反应途径的研究。

卤醚在工业中被广泛使用，由于它们的毒性和致癌性，将这些物质释放到环境中引起了极大的关注。本研究涉及在存在TiO（2）粒子和UV-A（λ= 365 nm）辐射的情况下卤代醚双（2-氯乙氧基）甲烷（BCEXM）的光催化降解。紫外线照射16h后，约99.5％的BCEXM降解。发现溶液pH值，TiO（2）用量和阴离子的存在等因素会影响降解速率。为了更好地理解这种用紫外线辐照的BCEXM的TiO（2）辅助光降解机理的机械细节，分离，鉴定和表征了工艺的中间体，并通过固相微萃取（SPME）和气相色谱/质谱进行了表征。光谱分析（GC / MS）技术。据我们所知，这是有关BCEXM降解途径的第一份报告。破坏BCEXM的第一步被认为是通过（）OH提取氢形成一个以碳为中心的自由基，然后与O（2）反应形成一个过氧自由基。过氧自由基彼此反应并产生烷氧基。烷氧基的β键断裂产生不同的中间体。