Effect of anode modification on the performance of microbial fuel cell for dealing with the straw hydrolysate
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摘要: 以玉米秸秆稀酸水解液为阳极底物，用污水处理厂活性污泥为产电微生物菌源构建双室微生物燃料电池（MFC），采用三种不同方法改性阳极碳毡，并对其MFC产电性能进行研究。结果表明，以未改性碳毡（CC）、HNO3酸解CC（HNO3/CC）、壳聚糖改性CC（chitosan/CC）、PDADMAC/α-Fe2O3层层自组装改性碳毡（PDADMAC/α-Fe2O3/CC）的MFC的最大产电量分别为248、315、452和522 mV，最大功率密度分别为54.6、92.7、203.8和248.1 mW/m2，COD的去除率分别为82.21%、81.46%、82.53%和86.44%。循环伏安曲线显示，PDADMAC/α-Fe2O3层层自组装改性的阳极碳毡具有较高的氧化还原电位。电化学阻抗谱图表明，PDADMAC/α-Fe2O3层层自组装改性碳毡的极化内阻最小，为7 Ω。几种改性材料为阳极的MFC性能依次为PDADMAC/α-Fe2O3/CC >壳聚糖/CC > HNO3/CC >空白CC。Abstract: A microbial fuel cell (MFC) was built with corn stalk hydrolysis solution as the anode substrate and activated sludge source bacteria as the anode microbes. The anode carbon felt (blank CC) was modified by various methods such as HNO3 acid treatment (HNO3/CC), chitosan modification (chitosan/CC) and layer-by-layer self-assembly (PDADMAC/α-Fe2O3/CC); the effect of anode modification on the performance of MFC in electricity generation was investigated. The results indicate that with blank CC, HNO3/CC, chitosan/CC and PDADMAC/α-Fe2O3/CC as the anode materials, the maximum electricity outputs of MFC are 248, 315, 452 and 522 mV, respectively, the maximum power densities are 54.6, 92.7, 203.8 and 248.1 mW/m2, respectively, and the COD removal rates are 82.21%, 81.46%, 82.53% and 86.44%, respectively. Moreover, PDADMAC/α-Fe2O3/CC exhibits the highest redox potential according to the CV curves and minimum polarization resistance (7 Ω) as determined by the EIS curves. As a result, the performance of MFC with four anodes follows the order of PDADMAC/α-Fe2O3/CC > chitosan/CC > HNO3/CC > blank CC.
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Key words:
- microbial fuel cell /
- straw hydrolysate /
- carbon felt /
- anode modification
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图 2 阳极材料表面的扫描电镜照片
Figure 2 Scanning electron microscopy images of the different anodes
(a): blank CC; (b): HNO3/CC; (c): chitosan/CC; (d): PDADMAC/α-Fe2O3/CC
图 7 不同阳极材料的阻抗谱图
Figure 7 Electrochemical impedance spectra of MFC with different anodes
表 1 不同阳极时秸秆各组分的降解率
Table 1 Degradation rates of various straw components of MFC with different anodes
Sample w/% total sugar yield total quality cellulose hemicellulose lignin Blank CC 54.2 37.9 48.9 10.6 1.7 HNO3/CC 52.7 39.3 52.7 13.1 1.9 Chitosan/CC 55.9 41.9 57.4 11.7 1.9 PDADMAC/α-Fe2O3/CC 58.3 44.2 59.7 13.8 1.8 
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