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化工进展  2015 

分子模拟多溴联苯醚在石英砂纳米孔中的吸附行为

DOI: 10.16085/j.issn.1000-6613.2015.09.037, PP. 3444-3451

Keywords: 分子模拟,多溴联苯醚,石英砂纳米孔,土壤有机质,吸附

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Abstract:

多溴联苯醚(PBDE)是一种广泛使用的阻燃剂,也是普遍关注的持久性有机污染物之一。利用分子模拟手段建立5种低溴代PBDE分子(BDE-28、BDE-47、BDE-77、BDE-99、BDE-153)在石英砂纳米孔(2.0nm、2.5nm、3.0nm、3.5nm)中的吸附模型,利用孔径变化模拟土壤的物理老化过程,并研究土壤有机质(SOM)对PBDE吸附能与均方位移(MSD)的影响。结果表明,孔径的缩小降低了体系的总势能和非键能,使其体系更加稳定;然而PBDE与石英砂之间的吸附能随孔径的缩小而增大,且该吸附能以范德华力为主,占体系吸附能的84.0%。SOM的加入则导致体系的总势能和非键能以及PBDE与石英砂之间的吸附能均降低,虽然与石英砂孔内表面的吸附能降低有利于PBDE分子的迁移,但由于SOM与PBDE之间的吸附作用占主导,抑制了PBDE在纳米孔中的扩散,因此PBDE的MSD值反而降低。

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