微生物电催化转化反应器(BECR)转化CO_2合成有机化合物

Converting CO_2 to organic compounds using a bioelectro chemical catalysis reactor (BECR)

针对大量CO_2所带来的环境问题,构建BECR(Bioelectrochemical catalysis reactor)反应系统,将电化学还原与微生物催化还原相结合,转化CO_2合成有机化合物.从牛粪中分离筛选出产氢菌(Clostridium sp.S1),确定最优产氢条件.将筛选好的菌种接入BECR电催化转化反应器,通入CO_2,外加恒定阴极电势,检测合成的有机化合物.结果表明,反应装置接入电化学工作站进行CV测试时,在-0.7 V时出现还原峰发生还原反应,恒电位仪恒定阴极电势,合成的化合物为甲醇和乙酸.在24 h时甲醇和乙酸的积累量达到最大分别为3.096 mmol·L^(-1)和2.01 mmol·L^(-1).在电化学和微生物的共同作用下,实现了对CO_2的还原过程,并合成了有机化合物.

In view of the environmental problems brought by the large amount of CO2, a bioelectro-chemical catalysis reactor system （BECR） was constructed, where CO2 was converted into organic compounds by the electrochemical reduction combined with microbial catalytic reduction. Clostridium sp.S1 was separated and screened from the cow dung, and thereafter its optimal production conditions were determined. After adding the selected bacterium into BECR, carbon dioxide was added and the cathodic potential was kept at a constant, and then the reaction products were analyzed. In order to perform cyclic voltammetry（CV） test, the reactor was connected to an electrochemical workstation. The result showed that a reduction peak in the cyclic voltammogram was observed at -0.7 V, which indicated the reduction reaction occurred. The reaction compounds were found to be methanol and acetic acid. After 24 h the maximum accumulation of methanol and acetic acid reached 3.096 mmol·L-1 and 2.01 mmol·L-1, respectively. Therefore, CO2 was reduced and converted into organic compounds with the combined actions of electrochemistry and microorganism.