摘要
结合极化曲线和全电池电化学交流阻抗测试,研究了菲对沉积型微生物燃料电池(Sediment Microbial Fuel Cell,SMFC)体系电能输出和COD去除率的影响.结果表明,当菲浓度为0、0.5、1.0、5.0、10.0 mg·L-1时,体系输出电压峰值分别为186.1、283.4、136.7、112.7、74.7 m V,COD去除率分别为30.8%、39.4%、26.7%、23.5%和22.0%,库伦效率则为5.4%、7.1%、4.1%、2.7%和2.1%.SMFC体系的电能输出、污染物去除和库伦效率随菲浓度升高,先促进后抑制,0.5 mg·L-1菲可促进电能输出.电化学交流阻抗谱测试结果表明,0.5 mg·L-1菲体系的欧姆内阻、活化内阻和浓差极化内阻均最小,分别为20.79Ω、14.94Ω和106.8Ω,其表观内阻主要由扩散或浓差极化内阻构成,其次为欧姆内阻,阳极氧化反应和阴极还原反应的活化内阻所占比例最小.
Combining polarization curves and electrochemical impedance spectroscopy（ EIS）,the effect of phenanthrene on the electricity generation and COD removal of sediment microbial fuel cell（ SMFC） was investigated in this work. The results showed that the peak voltages of SMFCs were186. 1,283. 4,136. 7,112. 7 m V and 74. 7 m V with phenanthrene of 0,0. 5,1. 0,5. 0 mg·L^-1and 10. 0 mg·L^-1. COD removals were 30. 8%,39. 4%,26. 7%,23. 5% and 22. 0%. Coulombic efficiencies were 5. 4%,7. 1%,4. 1%,2. 7% and 2. 1%. With the increase in phenanthrene concentration of SMFC systems,the electricity generation,COD removal and coulombic efficiency were first enhanced and then suppressed. SMFC performance was improved with 0. 5 mg·L-1phenanthrene. EIS revealed that SMFC reactor with 0. 5 mg·L^-1phenanthrene exhibited the lowest ohmic resistance（ 20. 79 Ω）,activation resistance（ 14. 94 Ω） and diffusion resistance（ 106. 8Ω）. Its apparent internal resistances mainly consisted of the diffusion or activation resistances,and then the ohmic one. The activation resistances of the anode and cathode had minor influence.
出处
《环境化学》
CAS
CSCD
北大核心
2014年第12期2185-2190,共6页
Environmental Chemistry
基金
国家自然科学基金项目(21076097
21206058)
水体污染控制与治理科技重大专项(2012ZX07101-013-04)
中央高校基本科研业务费专项资金资助(JUSRP111A09)资助
关键词
菲
沉积型微生物燃料电池
产电
phenanthrene
sediment microbial fuel cell（SMFC）
electricity generation
作者简介
通讯联系人，Tel：0510—85326516；E-mail：xfli@jiangnan．edu．cn
