Centre for Marine BioInnovation, University of New South Wales, Sydney 2052, Australia.
Water Res. 2010 Mar;44(5):1580-90. doi: 10.1016/j.watres.2009.11.004. Epub 2009 Nov 10.
A system for the purification of organochlorine contaminated activated carbon is described. The system involves a continuous flow of aqueous ethanol to purge organochlorines from activated carbon. The organochlorine laden solvent is simultaneously treated with zero valent zinc as the bulk electron source, water as the proton source and the electron shuttle cyanocobalamin as a catalyst for reductive dechlorination. The system was characterised by performing batch reactions and extractions before being applied in a continuous flow system. In particular the ratio of water to ethanol in the system needed to be optimised. Water is needed for the reductive dechlorination reaction whilst it is not conducive to the extraction process. An 80% ethanolic solution was found to give optimal reductive dechlorination rates without compromising extraction of organochlorines from activated carbon. Of three electron shuttles evaluated cyanocobalamin was discovered to be the most relevant to the system with respect to reductive dechlorination rates and its ability to avoid absorption to activated carbon.
描述了一种用于净化有机氯污染活性炭的系统。该系统涉及连续流动的含水乙醇，以从活性炭中清除有机氯。载有有机氯的溶剂同时用零价锌作为体相电子源、水作为质子源和电子穿梭氰钴胺素作为还原脱氯的催化剂进行处理。在应用于连续流动系统之前，通过进行分批反应和萃取对该系统进行了表征。特别是需要优化系统中乙醇与水的比例。水是还原脱氯反应所必需的，而不利于萃取过程。发现 80%的乙醇溶液在不影响从活性炭中萃取有机氯的情况下，能给出最佳的还原脱氯速率。在所评估的三种电子穿梭体中，氰钴胺素在还原脱氯速率及其避免被活性炭吸收的能力方面，被发现是与该系统最相关的。
