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研究报告

Enhancement of anthraquinone-2，6-disulfonate on the reductive dechlorination performance of an enzyme electrolytic cell

摘要：采用氧化还原介质强化酶电解池（EEC）还原脱氯性能，结果发现，蒽醌-2，6-二磺酸盐（AQDS）、吩嗪-1-甲酰胺（PCN）、氰钴胺（CNB₁₂）和核黄素（RF）均可明显提高EEC系统还原脱氯性能，二氯甲烷（DCM）脱氯率从57%分别提升至81%、72%、86%、84%.考虑到经济成本，选择AQDS作为氧化还原介质进行强化EEC系统还原脱氯性能.在EEC阴极中，AQDS被还原成AH₂QDS，可直接与DCM发生氧化还原反应，但不能作为脱卤酶辅酶提高DCM脱氯率.还原性谷胱甘肽（GSH）是脱卤酶的天然辅酶，AQDS加速GSH消耗，且抑制GSH再生.此外，AQDS提升了EEC系统的库仑效率，这意味着更多电子参与了AH₂QDS生成.因此，可以推测AQDS是通过直接还原作用强化EEC系统脱氯性能.AQDS-EEC系统的最佳pH值、温度、外加电压分别为7、35 ℃、-1.2 V vs Ag/AgCl.

Abstract：In this study， four redox media were used to enhance the reductive dechlorination of an enzyme electrolysis cell （EEC）. Evidently， anthraquinone-2，6-disulfonate （AQDS）， cyanobalamin （CNB₁₂）， phenazine-1-foramide （PCN） and Riboflavin （RF） improved the reductive dechlorination performance of the EEC， and the dechlorination rate of dichloromethane （DCM） increased from 57% to 81%， 86%， 72% and 84%， respectively. Considering the economic cost， AQDS was chosen as the redox medium for further research. In EEC cathode， AQDS was reduced to AH₂QDS， which can directly react with DCM， but cannot act as a dehalogenase coenzyme. The presence of AQDS accelerated the consumption and inhibited the generation of GSH， which is a natural coenzyme of dehalogenase. Additionally， AQDS improved the Coulomb efficiency of the EEC， indicating that more electrons are involved in the production of AH₂QDS. Therefore， it can be speculated that the direct reduction of DCM by AH₂QDS accounted for the improvement of reductive dechlorination performance by AQDS. The optimum pH， temperature and applied voltage of the EEC enhanced by AQDS were determined to be 7， 35 ℃ and -1.2 V vs Ag/AgCl， respectively.

Key words：enzyme electrolytic cell（EEC） redox media anthraquinone-2,6-disulfonate（AQDS） reductive dichlorination dichloromethane （DCM）