Cu_(2)O/rGO修饰阴极对MFC产电脱氮性能及菌群结构的影响  

Effects of Cu_(2)O/rGO modified cathode on MFC electricity generation,denitrification performance and bacterial community structure

作　　者：郭金燕 马志远 杨佳琪 廉静[1] 牛艳艳 岳琳[1] GUO Jinyan;MA Zhiyuan;YANG Jiaqi;LIAN Jing;NIU Yanyan;YUE Lin(College of Environmental Sciences and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China;Key Laboratory of Geological Resources and Environment Monitoring and Protection of Hebei Province,Hebei Institute of Geological Environment Monitoring,Shijiazhuang 052460,Hebei,China)

机构地区：[1]河北科技大学环境科学与工程学院,河北省污染防治生物技术实验室,河北石家庄050018 [2]河北省地质环境监测院,河北省地质资源环境监测与保护重点实验室,河北石家庄052460

出　　处：《精细化工》2022年第12期2550-2560,2592,共12页Fine Chemicals

基　　金：国家自然科学基金(51678387);河北省人才工程资助项目(A201902019)。

摘　　要：通过还原法制备了Cu_(2)O/还原氧化石墨烯(Cu_(2)O/rGO)复合材料,采用SEM、FTIR、EDS、XRD、XPS、氮气吸附-脱附、循环伏安曲线对其结构和氧还原性能进行了表征和测试。将Cu_(2)O/rGO复合材料负载于碳布制得了Cu_(2)O/rGO阴极,以硝酸盐作为模型污染物,将其作为微生物燃料电池(MFC)的阴极,探究其对MFC产电脱氮性能和微生物菌落结构的影响。结果表明,Cu_(2)O/rGO复合材料具有大量的介孔结构和良好的氧还原可逆性。与Pt/C阴极相比,Cu_(2)O/rGO阴极的交换电流密度升高了47.77%,电荷转移阻抗降低了65.53%。Cu_(2)O/rGO-MFC在处理NO_(3)^(–)-N废水时平均最大输出电压为662.54 m V、最大功率密度为26.27 m W/cm^(2)、平均库仑效率为32.02%、NO_(3)^(–)-N去除速率为83.33 mg/(L·h),均高于Pt/C-MFC[485.33 m V、16.98 m W/cm^(2)、7.38%、41.67 mg/(L·h)]。Cu_(2)O/rGO-MFC阴极生物膜中反硝化关键酶活性和胞外聚合物含量增加,同时,功能性微生物Betaproteobacteria和Alphaproteobacteria纲的丰度分别较Pt/C-MFC增加了35.66%和36.96%。Cuprous oxide/reduced graphene oxide(Cu_(2)O/rGO)composites were synthesized via reduction methods,characterized and tested by SEM,FTIR,EDS,XRD,XPS,N2adsorption-desorption and cyclic voltammetry curves for analysis on structure and oxygen reduction performance.Cu_(2)O/rGO cathode was then prepared by loading Cu_(2)O/rGO composites obtained on carbon fabric and used as the cathode of microbial fuel cell(MFC)with nitrate as model pollutant,followed by investigation on the effect of Cu_(2)O/rGO cathode on the performance of MFC for electricity generation,nitrogen removal and the structure of microbial colony.The results showed that Cu_(2)O/rGO composites had a mesopore-rich structure and good redox reversibility.Compared with those of Pt/C cathode,the exchange current density of Cu_(2)O/rGO cathode increased by 47.77%,while the charge transfer impedance decreased by 65.53%.Moreover,Cu_(2)O/rGO-MFC exhibited higher average maximum output voltage(662.54 m V),maximum power density(26.27 m W/cm^(2)),NO_(3)^(–)-N removal rate[83.33 mg/(L·h)],and average coulomb efficiency(32.02%)than Pt/C-MFC[485.33 m V,16.98 m W/cm~2,7.38%,41.67 mg/(L·h)].Meanwhile,the activity of denitrification key enzymes and content of extracellular polymer in Cu_(2)O/rGO-MFC cathode biofilm were increased.The abundance of functional microorganisms Betaproteobacteria and Alphaproteobacteria were also increased by 35.66%and 36.96%,respectively.

关 键 词：Cu_(2)O/rGO复合材料 微生物燃料电池 电化学性能 输出电压 脱氮 微生物群落 水处理技术 

分 类 号：X703[环境科学与工程—环境工程] TM911.45[电气工程—电力电子与电力传动]