(江蘇理工學院 化學與環(huán)境工程學院，常州 213001)
摘 要: 為回收含Co(Ⅱ)溶液中的金屬鈷，以微生物燃料電池(Microbial fuel cell，MFC)降解有機物產生的電能驅動微生物電解池(Microbial electrolysis cell，MEC)，實現MFC-MEC耦合系統(tǒng)自驅動運行。同時，在MEC的陰極還原Co(Ⅱ)，研究不同MEC陰極電極材料、pH值以及電極極距等條件對Co(Ⅱ)處理的影響。結果表明：以碳紙為MEC陰極電極材料時，可得到較小的內阻1359.6 Ω，庫倫效率CE和陰極效率ηca分別為33.1%和21.6%，鈷比收率為2.99 gCo/gCOD，陰極Co(Ⅱ)去除率為62.5%；MEC陰極液pH為3時，ηca為43.9%，鈷比收率為0.73 gCo/gCOD，Co(Ⅱ)去除率為88%；MEC極距為16cm時，可得到較高的陽極庫倫效率20.5%和鈷比收率0.85 gCo/gCOD，陰極Co(Ⅱ)去除率可以達到97.4%。經XRD分析，陰極產物為金屬鈷。
關鍵字: 微生物燃料電池；微生物電解池；生物電化學；耦合系統(tǒng)；鈷回收
（School of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China）
Abstract:In order to recover the metal cobalt in the Co(Ⅱ) solution, a microbial electrolysis cell (MEC) was driven by a microbial fuel cell (MFC), in which the degradation of organic matter produced electricity, the MFC-MEC coupling system can be self-driven, and at the same time, the Co(Ⅱ) was reduced in the MEC cathode chamber. The effects of different MEC cathode electrode materials, pH and electrode pole distance on the treatment of cobalt ions were investigated. The results show that carbon paper can be used as the MEC cathode electrode material to obtain a small internal resistance of 1359.6 Ω，CE and ηca are 33.1% and 21.6%, respectively, the specific yield of cobalt is 2.99 gCo/g COD, and the removal rate of Co(Ⅱ) is 62.5%. When the pH of the MEC catholyte is 3, hca reaches 43.9%, the specific yield of cobalt is 0.73 gCo/g COD, and the removal efficiency of Co(Ⅱ) reaches 88%. When the MEC electrode spacing is 16 cm, the highest anode coulombic efficiency is 20.5% and the cobalt specific yield is 0.85 gCo/g COD, the Co(Ⅱ) removal rate in the cathode reaches 97.4%, and the XRD analysis shows that the cathode product is cobalt.
Key words: microbial fuel cell; microbial electrolysis cell; bioelectrochemistry; coupling system; cobalt recovery
