生物阴极的构建方法对偶氮染料降解过程的影响

生物阴极可以强化偶氮染料在生物电化学系统中的脱色降解过程.针对三种不同的生物阴极构建方法进行了评估分析.实验结果表明,三种方法都可以加速偶氮染料在阴极的脱色降解,反应过程基本属于一级动力学过程.其中利用生物阳极反转方法构建的生物阴极展示出了最大的催化电流(0.12 mA)和偶氮染料去除效率(85.2%),厌氧污泥接种方法构成的生物阴极在电子回收率方面具备优势(71.8%).对生物阴极的微生物群落结构进行分析,发现电极表面存在着大量与电化学活性和偶氮染料脱色功能相关的微生物,表明生物阴极的强化作用与微生物膜的组成密切相关.

Effects of Biocathode Construction Methods on Azo Dye Degradation Process

The biocathode can enhance the azo dye decolorization process in bioelectrochemical system. Three construction methods for biocathode were analyzed. The experimental results indicated that all the biocathodes formed by those methods could accelerate the azo dye decolorization process and those reactions were mostly dynamical processes. Among those methods， the anode polarity-reversal method showed the maximum catalytic current (0.12mA) and azo dye removal efficiency (85.2%). While the other method，in which the biocathode was formed by anaerobic sludge inoculation，had the advantage in electron recovery efficiency(71.8%). By analyzing the microbial biofilm structure of biocathodes， there were large amount of microbes correlated with functions of electrochemical activity or azo dye decolorization， which indicated that the enhancing effect of biocathodes related closely to the biofilm structures.