Photochlorination of Polycyclic Aromatic Hydrocarbons in Acidic Brine Solution
Photochlorination of Polycyclic Aromatic Hydrocarbons in Acidic Brine Solution
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DOI：
10.1007/s00128-015-1723-1
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发表时间：
2016-01
影响因子：
2.7
通讯作者：
T. Ohura;M. Miwa
中科院分区：
文献类型：
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作者：
T. Ohura;M. Miwa
在含有氯化钠和多环芳烃的毫升Q水/合成水中，用紫外光或可见光研究了多环芳烃通过光氯化生成氯化多环芳烃的可能性。在酸性条件下，在紫外光和可见光的共同作用下，芘发生了光氯化反应，生成了主要产物1-氯吡喃。在可见光照射下，苯并[a]芘生成6-氯苯并[a]芘，但该反应依赖于溶液的pH值。多环芳烃的光氯化反应通过连续反应模型进行。测定了与光氯化和光衰变过程有关的速率常数，其观测值和理论值表现出相似的趋势，而观测值大约比理论值低50-1000倍。较低的观测值可能是由于多环芳烃的光衰变而不是光氯化。因此，由于多环芳烃的光氯化似乎受到溶液pH的显著影响，这一信息可能允许将对环境的影响降至最低。
The potential for the formation of chlorinated polycyclic aromatic hydrocarbons via photochlorination of PAHs has been investigated in milli-Q water/synthetic water containing NaCl and PAHs with either UV or visible light. The photochlorination of pyrene occurred under acidic conditions in the presence of both UV and visible light, resulting in 1-chloropyrene as the main product. Benzo[a]pyrene yielded 6-chlorobenzo[a]pyrene following visible light irradiation; however the reaction was dependent upon solution pH. The photochlorination of PAHs was proposed to proceed via a consecutive reaction model. The rate constants associated with the photochlorination and photodecay processes were determined with the observed and theoretical values displaying similar trends, whereas the observed values were approximately 50–1000 times lower than the theoretical values. The lower observed values could be due to undergo photodecay rather than photochlorination of PAHs. Therefore, as photochlorination of PAHs appears to be significantly affected by solution pH, this information may allow for minimizing the impact on the environment.