...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science and Pollution Research >Application of gas diffusion biocathode in microbial electrosynthesis from carbon dioxide
【24h】

Application of gas diffusion biocathode in microbial electrosynthesis from carbon dioxide

机译：气体扩散生物病变在二氧化碳中微生物电气的应用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Microbial catalysis of carbon dioxide (CO2) reduction to multi-carbon compounds at the cathode is a highly attractive application of microbial electrosynthesis (MES). The microbes reduce CO2 by either taking the electrons or reducing the equivalents produced at the cathode. While using gaseous CO2 as the carbon source, the biological reduction process depends on the dissolution and mass transfer of CO2 in the electrolyte. In order to deal with this issue, a gas diffusion electrode (GDE) was investigated by feeding CO2 through the GDE into the MES reactor for its reduction at the biocathode. A combination of the catalyst layer (porous activated carbon and Teflon binder) and the hydrophobic gas diffusion layer (GDL) creates a three-phase interface at the electrode. So, CO2 and reducing equivalents will be available to the biocatalyst on the cathode surface. An enriched inoculum consisting of acetogenic bacteria, prepared from an anaerobic sludge, was used as a biocatalyst. The cathode potential was maintained at -1.1 V vs Ag/AgCl to facilitate direct and/or hydrogen-mediated CO2 reduction. Bioelectrochemical CO2 reduction mainly produced acetate but also extended the products to ethanol and butyrate. Average acetate production rates of 32 and 61 mg/L/day, respectively, with 20 and 80 % CO2 gas mixture feed were achieved with 10 cm(2) of GDE. The maximum acetate production rate remained 238 mg/L/day for 20 % CO2 gas mixture. In conclusion, a gas diffusion biocathode supported bioelectrochemical CO2 reduction with enhanced mass transfer rate at continuous supply of gaseous CO2.
机译：将二氧化碳（CO2）的微生物催化在阴极上的多碳化合物还原为微生物电气合成（MES）的高度吸引力。微生物通过取电子或减少在阴极处产生的等同物减少CO 2。在使用气态CO 2作为碳源时，生物还原过程取决于电解质中CO 2的溶解和传质。为了处理这个问题，通过将CO 2通过GDE进入MES反应器来研究气体扩散电极（GDE），以便在生物探测器上还原。催化剂层（多孔活性炭和Teflon粘合剂）和疏水气体扩散层（GDL）的组合在电极处产生三相界面。因此，在阴极表面上的生物催化剂将可获得CO 2和还原等同物。由由厌氧污泥制备的乙酰菌细菌组成的富集的接种物用作生物催化剂。将阴极电位保持在-1.1V VS Ag / AgCl，以促进直接和/或氢介导的CO 2还原。生物电化学二氧化碳减少主要生产乙酸盐，但也将产物延伸至乙醇和丁酸盐。分别为32和61mg / L /天的平均醋酸盐生产率，用10cm（2）GDE实现了20和80％的CO 2气体混合物进料。对于20％CO 2气体混合物，最大醋酸盐生产率为238mg / l /天。总之，气体扩散生物病变支持在连续供应气态CO 2时以增强的传质速率降低生物电化学二氧化碳。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号