藻炭改性电极强化微生物燃料电池产电及去除硝基苯性能

开发利于微生物富集和优异导电性能的电极是提高微生物燃料电池（MFC）性能的关键。通过碱活化和酸活化方式制备螺旋藻生物炭（简称藻炭）并将其修饰于阳极炭毡（CF），以硝基苯为难降解污染物代表，通过检测电极电化学性能和污染物降解过程，探究基于藻碳MFC产电及转化污染物的性能。结果表明：在700 ℃-NaOH改性藻炭修饰炭毡的电极体系（NaOH-AC700/CF），MFC电压最高可达670 mV，比CF体系高26%，且驯化时间由7 d缩短至2 d。修饰电极体系产电的同时高效降解污染物，阴极对硝基苯的去除率最高可达99.9%；相比于CF体系，NaOH-AC700/CF体系的降解效率提高了22.1%，苯胺生成率提高了123.3%。微生物种类分析结果表明，电极表面的产电菌主要为弧形杆菌属（Arcobacter）和铜绿假单胞菌属（Pseudomonas），且在NaOH-AC700/CF阳极表面产电菌丰度最高，因而利于MFC产电以及硝基苯的还原。

Removal efficiency of nitrobenzene and electricity generation by microbial fuel cell with algal biochar modified electrode

Development of electrodes that facilitate microbial enrichment and excellent electrical conductivity is the key to improving the performance of microbial fuel cell (MFC). By acid and base activation way, the anode carbon felt (CF) with spirulina biochar (one type of algal biochar) was modified. The performance of MFC based on modified electrodes for electricity generation and pollutant conversion was explored with nitrobenzene as a representative of refractory pollutants, by detecting the electrochemical performance of the electrode and the pollutant degradation process. The results showed that the maximum MFC voltage in the modified CF electrode system (NaOH-AC700, 700 ℃ and modified by NaOH) could reach up to 670 mV, which was 26% higher than CF system, and the acclimation time was reduced from 7 days to 2 days. The modified electrode system could efficiently generate electricity while also degrading pollutants. The removal of nitrobenzene by the cathode in the modified CF electrode system was 99.9%, which was 22.1% higher than the unmodified CF electrode system, and the aniline production was increased by 123.3%. Microbial community analysis showed that the electrogenic microorganisms on the electrode surface were mainly Arcobacter and Pseudomonas, and the highest abundance of electrogenic microorganisms was found on the surface of NaOH-AC700/CF anode, thus facilitating the electrogenesis of MFC and the reduction of nitrobenzene.