Magnetite nanoparticles accelerate the autotrophic sulfate reduction in biocathode microbial electrolysis cells
Magnetite nanoparticles accelerate the autotrophic sulfate reduction in biocathode microbial electrolysis cells
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磁铁矿纳米粒子加速生物阴极微生物电解细胞中自养硫酸盐还原
DOI：
10.1016/j.bej.2018.01.036
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发表时间：
2018-05-15
影响因子：
3.9
通讯作者：
Zhang, Renduo
中科院分区：
文献类型：
--
作者：
Hu, Jiaping;Zeng, Cuiping;Zhang, Renduo
研究了纳米磁铁矿颗粒对微生物电解槽（MEC）中硫酸盐自养还原生物阴极性能的影响。MEC中的生物阴极分别使用添加和不添加磁铁矿纳米颗粒（初始铁含量为0.64 mM）的阴极介质启动。加入磁铁矿后，硫酸盐还原率达到152 +/- 7.0 g m（-3）d（-1），比不加磁铁矿的MEC提高了122%。在有和没有磁铁矿的MEC中的电子恢复效率分别为56.1%和29.6%。在磁铁矿的作用下，生物阴极的循环伏安峰电流比未加磁铁矿的生物阴极高出约2倍，表明其具有更高的电化学活性。扫描电镜和能谱分析表明，磁铁矿-生物阴极上形成了球状物质和硫化铁。共聚焦激光扫描显微镜显示，与没有磁铁矿相比，生物阴极中生物膜的生物量、厚度和活力增加。脱硫弧菌的相对丰度为72.2%的生物阴极与磁铁矿相比，27.5%，没有磁铁矿。导电磁铁矿能直接影响微电解槽中电化学活性生物膜的形成，促进硫酸盐还原。(C)2018 Elsevier B. V.版权所有。
The aim of this study was to investigate the effect of magnetite nanoparticles on the performance of autotrophic sulfate-reducing biocathode in microbial electrolysis cell (MEC). The biocathodes in MECs were start-up using cathode medium with and without magnetite nanoparticles addition (with initial iron content of 0.64 mM), respectively. With magnetite, the sulfate reductive rate reached 152 +/- 7.0 g m(-3) d(-1), which was improved by 122% than the MEC without magnetite. The electron recovery efficiencies in MECs with and without magnetite were 56.1% and 29.6%, respectively. With the effect of magnetite, the peak currents in cyclic voltammograms of the biocathode were about two times higher than that without magnetite, indicating its higher electrochemical activity. Analyses of the scanning electron microscope and the energy dispersive spectrometer showed that pilus-like substance and iron-sulfide were formed on the magnetite-biocathode. Confocal laser scanning microscopy showed the increase of the biomass, thickness, and viability of biofilm in the biocathode with magnetite compared to those without magnetite. The relative abundance of Desulfovibrio sp. was 72.2% in the biocathode with magnetite compared to 27.5% without magnetite. The conductive magnetite could affect the development of electrochemical active biofilm directly and accelerate sulfate reduction in the MEC. (C) 2018 Elsevier B.V. All rights reserved.