张鹏程^1,,
王黎¹,
陈小进¹,
胡宁¹,
李洋洋¹
1.武汉科技大学资源与环境工程学院，武汉 430081
基金项目: 国家自然科学基金资助项目（51574185）

Effect of cathode size on the production of organic matter from carbon dioxide by microbial electrosynthesis system

ZHANG Pengcheng^1,,
WANG Li¹,
CHEN Xiaojin¹,
HU Ning¹,
LI Yangyang¹
1.College of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

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摘要:利用微生物电合成系统（microbial electrosynthesis system，MES）还原CO2合成有附加值的有机物是环境领域的热门研究方向。使用微生物电合成系统，驯化富集具有电化学活性的阴极功能微生物，通过调整阴极的大小，评价其对CO2还原的影响。设定阴极电势-0.8 V (vs Ag/AgCl)，保持阳极面积为32 cm2，调整阴极面积大小。在64 cm2的阴极面积下，MES可以获得最大的有机物产量和最佳性能，电流密度可达到2.03 A·m-2，乙酸、丁酸的最大积累量分别为262.04 mg·L-1和87.63 mg·L-1，总库伦效率达到91%。扫描电镜SEM分析表明，阴极碳毡上菌体数量较多，多为杆状菌和球菌。高通量菌群分析表明，Clostridium、Butyribacterium和Geobacter是MES阴极生物膜上的优势菌属，其丰度分别占总菌群的48.13%、7.8%和8.2%。在保证较小阳极面积的同时，适当增大阴极面积，确实可以提高MES还原CO2合成有机物的产量及提升系统的库伦效率。
关键词: 微生物电合成系统/
二氧化碳/
阴极大小/
乙酸/
丁酸

Abstract:CO2 reduction to high value-added organics with microbial electrosynthesis system (MES) has been a popular research direction in environmental fields. This study evaluated the effect of cathode size on organics production from CO2 in a MES with a mixed-culture biocathode. When the biocathode potential and anode size were set at -0.8 V (vs Ag/AgCl) and 32 cm2, respectively, both the maximum organics production amount and the best energetic performances occurred for the MES with the adjusted cathode size of 64 cm2, the current density reached 2.03 A·m-2, the maximum concentration of acetic acid and butyrate was 262.04 mg·L-1 and 87.63 mg·L-1 during a reaction cycle of 10 days, respectively. The total electron recovery of MES reached 91%. Scanning electron microscope (SEM) confirmed that a variety of microorganisms, most of which were the rod and sphere morphologies, were attached on the cathode carbon felt. High-throughput analysis showed that the cathodic dominant bacterial community was Clostridium, Butyribacterium and Geobacter, and their abundance accounted for 48.13%, 7.8% and 8.2% of the total bacterial population, respectively. This research proved that the increase of the cathode size with a small anode size in MES can increase the high value-added organics yield and coulombic efficiency.
Key words:microbial electrosynthesis system/
carbon dioxide/
cathode size/
acetic acid/
butyrate.

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刊出日期:2018-11-29

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阴极大小对微生物电合成系统还原二氧化碳产有机物的影响

张鹏程^1,,
王黎¹,
陈小进¹,
胡宁¹,
李洋洋¹
1.武汉科技大学资源与环境工程学院，武汉 430081
基金项目: 国家自然科学基金资助项目（51574185）
关键词: 微生物电合成系统/
二氧化碳/
阴极大小/
乙酸/
丁酸
摘要:利用微生物电合成系统（microbial electrosynthesis system，MES）还原CO2合成有附加值的有机物是环境领域的热门研究方向。使用微生物电合成系统，驯化富集具有电化学活性的阴极功能微生物，通过调整阴极的大小，评价其对CO2还原的影响。设定阴极电势-0.8 V (vs Ag/AgCl)，保持阳极面积为32 cm2，调整阴极面积大小。在64 cm2的阴极面积下，MES可以获得最大的有机物产量和最佳性能，电流密度可达到2.03 A·m-2，乙酸、丁酸的最大积累量分别为262.04 mg·L-1和87.63 mg·L-1，总库伦效率达到91%。扫描电镜SEM分析表明，阴极碳毡上菌体数量较多，多为杆状菌和球菌。高通量菌群分析表明，Clostridium、Butyribacterium和Geobacter是MES阴极生物膜上的优势菌属，其丰度分别占总菌群的48.13%、7.8%和8.2%。在保证较小阳极面积的同时，适当增大阴极面积，确实可以提高MES还原CO2合成有机物的产量及提升系统的库伦效率。

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