Department of Chemistry, SCSVMV University, Enathur, Kanchipuram 631 561, India.
J Hazard Mater. 2009 Dec 30;172(2-3):1470-5. doi: 10.1016/j.jhazmat.2009.08.014. Epub 2009 Aug 11.
Mediated electrochemical oxidation was carried out for the destruction of commercial pesticide formulations using cerium(IV) in nitric acid as the mediator electrolyte solution in a bench scale set up. The mediator oxidant was regenerated in situ using an electrochemical cell. The real application of this sustainable process for toxic organic pollutant destruction lies in its ability for long term continuous operation with continuous organic feeding and oxidant regeneration with feed water removal. In this report we present the results of fully integrated MEO system. The task of operating the continuous feed MEO system for a long time was made possible by continuously removing the feed water using an evaporator set up. The rate of Ce(IV) regeneration in the electrochemical cell and the consumption for the pesticide destruction was matched based on carbon content of the pesticides. It was found that under the optimized experimental conditions for Ce(III) oxidation, organic addition and water removal destruction efficiency of ca. 99% was obtained for all pesticides studied. It was observed that the Ce(IV) concentration was maintained nearly the same throughout the experiment. The stable operation for 6h proved that the process can be used for real applications and for possible scale up for the destruction of larger volumes of toxic organic wastes.
采用电化学氧化法，以硝酸铈（IV）为介体电解质溶液，在实验台上对商业农药制剂进行破坏。介体氧化剂在原位通过电化学池再生。该可持续工艺在有毒有机污染物破坏方面的实际应用在于其能够进行长期连续操作，实现有机进料连续化和氧化剂原位再生以及去除水。在本报告中，我们展示了完全集成的 MEO 系统的结果。通过设置蒸发器连续去除进料水，使连续进料 MEO 系统长时间运行成为可能。根据农药的碳含量，在电化学池内铈（IV）再生和用于农药破坏的消耗之间匹配速率。结果发现，在铈（III）氧化的优化实验条件下，对所有研究的农药，有机添加和水去除的破坏效率达到约 99%。观察到 Ce(IV) 浓度在整个实验过程中基本保持不变。经过 6 小时的稳定运行，证明该过程可用于实际应用和可能的扩大规模，以破坏更大体积的有毒有机废物。
