Department of Civil and Environmental Engineering, University of Ulsan, Ulsan 680-749, South Korea.
Environ Geochem Health. 2012 Jan;34 Suppl 1:105-13. doi: 10.1007/s10653-011-9416-0. Epub 2011 Aug 17.
Black carbon (BC) is an important class of geosorbents that control the fate and transport of organic pollutants in soil and sediment. We previously demonstrated a new role of BC as an electron transfer mediator in the abiotic reduction of nitroaromatic and nitramine compounds by Oh and Chiu (Environ Sci Technol 43:6983-6988, 2009). We proposed that BC can catalyze the reduction of nitro compounds because it contains microscopic graphitic (graphene) domains, which facilitate both sorption and electron transfer. In this study, we assessed the ability of different types of BC--graphite, activated carbon, and diesel soot--to mediate the reduction of 2,4-dinitrotoluene (DNT) and 2,4-dibromophenol (DBP) by H(2)S. All three types of BC enhanced DNT and DBP reduction. H(2)S supported BC-mediated reduction, as was observed previously with a thiol reductant. The results suggest that BC may influence the fate of organic pollutants in reducing subsurface environments through redox transformation in addition to sorption.
黑碳 (BC) 是一类重要的地球吸着剂，控制着土壤和沉积物中有机污染物的命运和迁移。我们之前证明了 BC 在 Oh 和 Chiu 的非生物还原硝芳烃和硝胺化合物中作为电子转移介体的新作用（Environ Sci Technol 43:6983-6988, 2009）。我们提出，BC 可以催化还原硝基化合物，因为它含有微观石墨（石墨烯）畴，这有利于吸附和电子转移。在这项研究中，我们评估了不同类型的 BC——石墨、活性炭和柴油烟尘——对 H(2)S 还原 2,4-二硝基甲苯 (DNT) 和 2,4-二溴苯酚 (DBP) 的能力。所有三种类型的 BC 都增强了 DNT 和 DBP 的还原。H(2)S 支持 BC 介导的还原，正如以前用硫醇还原剂观察到的那样。结果表明，BC 可能通过氧化还原转化，除了吸附之外，还会影响还原地下环境中有机污染物的命运。
