为寻找质优价廉的析氢催化剂,本研究以废旧金属网为单室微生物电解池(MEC)阴极,在不同外加电压下考察其制氢性能.同时利用16S r DNA扩增测序技术分析原接种污泥、MFC和MEC阳极微生物的菌落特点.实验结果表明,随着外加电压的增大,MEC产...为寻找质优价廉的析氢催化剂,本研究以废旧金属网为单室微生物电解池(MEC)阴极,在不同外加电压下考察其制氢性能.同时利用16S r DNA扩增测序技术分析原接种污泥、MFC和MEC阳极微生物的菌落特点.实验结果表明,随着外加电压的增大,MEC产生的最大电流密度和周期运行时间分别呈现增大和缩短的趋势.外加0.7 V电压时,废旧金属网阴极MEC的氢气产率和电能回收率分别达到0.330±0.012 m^3H2·m^-3·d^-1和177.0±5.6%,远高于0.5 V时的数值,与0.9 V时相差不大.废旧金属网阴极MEC的产氢能力可以和Pt/C阴极MEC相媲美,且具有良好的运行稳定性.16S r DNA扩增测序结果显示培养环境对微生物的富集与淘汰有很大影响.在外加电场环境中MEC阳极的优势菌落地杆菌属(Geobacter)得到很大程度富集,相对丰度高达79.4%以上.展开更多
This study for the first time proposed an efficient microbial electrolyte/UV system for Methyl Orange decomposition. With an external applied voltage of 0.2 V and cathode aeration of20 mL/min, H2O2 could be in-situ ge...This study for the first time proposed an efficient microbial electrolyte/UV system for Methyl Orange decomposition. With an external applied voltage of 0.2 V and cathode aeration of20 mL/min, H2O2 could be in-situ generated from two-electron reduction of oxygen in cathode, reaching to 8.1 mg/L in 2 hr and continued to increase. The pollutant removal efficiency of approximate 94.7% was achieved at initial neutral pH, with the activation of ·OH in the presence of UV illumination. Although the nature of its guiding principles remain on the vista of practical exploration, this proof-of-concept study provides an alternative operation pattern of solar–microbial hybrid technology for future wastewater treatment from a basic but multidisciplinary view.展开更多
文摘为寻找质优价廉的析氢催化剂,本研究以废旧金属网为单室微生物电解池(MEC)阴极,在不同外加电压下考察其制氢性能.同时利用16S r DNA扩增测序技术分析原接种污泥、MFC和MEC阳极微生物的菌落特点.实验结果表明,随着外加电压的增大,MEC产生的最大电流密度和周期运行时间分别呈现增大和缩短的趋势.外加0.7 V电压时,废旧金属网阴极MEC的氢气产率和电能回收率分别达到0.330±0.012 m^3H2·m^-3·d^-1和177.0±5.6%,远高于0.5 V时的数值,与0.9 V时相差不大.废旧金属网阴极MEC的产氢能力可以和Pt/C阴极MEC相媲美,且具有良好的运行稳定性.16S r DNA扩增测序结果显示培养环境对微生物的富集与淘汰有很大影响.在外加电场环境中MEC阳极的优势菌落地杆菌属(Geobacter)得到很大程度富集,相对丰度高达79.4%以上.
基金supported by the National Natural Science foundation of China(Nos.U1701243,51708184 and 51572089)Research Project of Guangdong Provincial Department of Science and Technology(No.2016B020240002)
文摘This study for the first time proposed an efficient microbial electrolyte/UV system for Methyl Orange decomposition. With an external applied voltage of 0.2 V and cathode aeration of20 mL/min, H2O2 could be in-situ generated from two-electron reduction of oxygen in cathode, reaching to 8.1 mg/L in 2 hr and continued to increase. The pollutant removal efficiency of approximate 94.7% was achieved at initial neutral pH, with the activation of ·OH in the presence of UV illumination. Although the nature of its guiding principles remain on the vista of practical exploration, this proof-of-concept study provides an alternative operation pattern of solar–microbial hybrid technology for future wastewater treatment from a basic but multidisciplinary view.
