Al Shra'ah Ahmad, Georghiou Paris E, Helleur Robert, MacQuarrie Stephanie L, Zhao Yuming, Mkandawire Martin
Department of Chemistry, Memorial University of Newfoundland, 230 Elizabeth Avenue, St. John's, Newfoundland and Labrador A1B 3X9, Canada.
Department of Chemistry and Verschuren Centre for Sustainability in Energy and the Environment, Cape Breton University, 1250 Grand Lake Road, Sydney, Nova Scotia B1P 6L2, Canada.
ACS Omega. 2018 Mar 27;3(3):3554-3561. doi: 10.1021/acsomega.8b00247. eCollection 2018 Mar 31.
Targeted degradation of individual polycyclic aromatic hydrocarbon (PAH) constituents like anthracene, may offer cost effective and efficient cleaning of coal tar-contaminated sites. Thus, a reductive degradation procedure of anthracene using activated magnesium with anhydrous ethanol at room temperature was developed and optimized. To determine the optimum conditions for anthracene, such as effective magnesium concentrations, glacial acetic acid volumes, and exposure time for the anthracene reduction, the experiments were designed using the response surface methodology based on the central composite design. The design also minimized the number of experiments. The main product from anthracene reduction is 9,10-dihyrdoanthracene. Optimum conditions for 98% degradation capacity of anthracene (2.80 × 10 mmol) were 30 mg of Mg powder (1.20 mmol), 60 μL of glacial acetic acid (1.05 mmol), and 30 min exposure time. When the optimized method was tested on the coal tar specimen, twice as many reagents (i.e., Mg and glacial acetic acid) were required to obtain a 90% degradation of anthracene and fluoranthene from the coal tar. This method of using activated Mg and anhydrous ethanol selectively reduces PAHs in coal tar; in particular anthracene and fluoranthene are most efficiently removed.
对蒽等多环芳烃（PAH）单个成分进行靶向降解，可能为煤焦油污染场地提供经济高效的清理方法。因此，开发并优化了一种在室温下使用活性镁和无水乙醇对蒽进行还原降解的方法。为了确定蒽降解的最佳条件，如有效镁浓度、冰醋酸体积和蒽还原的暴露时间，基于中心复合设计，采用响应面方法设计了实验。该设计还减少了实验次数。蒽还原的主要产物是9,10 - 二氢蒽。对于2.80×10 mmol蒽实现98%降解能力的最佳条件是30 mg镁粉（1.20 mmol）、60 μL冰醋酸（1.05 mmol）和30分钟暴露时间。当在煤焦样品上测试优化方法时，需要两倍的试剂（即镁和冰醋酸）才能使煤焦油中的蒽和荧蒽降解90%。这种使用活性镁和无水乙醇的方法能选择性地还原煤焦油中的多环芳烃；特别是蒽和荧蒽的去除效率最高。
