硝酸化学改性碳毡空气阴极的性能  

Performance of Chemically Modified Carbon Felt Air Cathode with HNO_3

作　　者：唐玉兰[1] 孙一[1] 于瑾[1] 刘军[1] 傅金祥[1] 

机构地区：[1]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168

出　　处：《中国给水排水》2014年第5期10-14,共5页China Water & Wastewater

基　　金：辽宁省自然科学基金资助项目(2013020120)

摘　　要：采用HNO3对碳毡进行化学改性,改性碳毡吸附用浸渍法制得的硝酸铁/活性炭粉催化剂,从而得到Fe/C催化剂碳毡空气阴极。通过稳态放电法和循环伏安测试等分析手段,研究了HNO3化学氧化时间对改性碳毡吸附Fe/C催化剂量、改性碳毡空气阴极电导率、改性碳毡空气阴极MFC产电性能和电池放电容量的影响,以及最优改性时间下的Fe/C催化剂碳毡空气阴极MFC处理垃圾渗滤液的性能及其运行稳定性。结果表明,随着HNO3化学氧化碳毡时间的延长,碳毡吸附的Fe/C催化剂量增多,改性碳毡空气阴极电导率增大并最终趋于稳定,改性碳毡空气阴极MFC的产电性能逐步提高,达到峰值后逐渐降低;改性碳毡吸附的催化剂过量,会增加电池内阻从而降低其产电性能;HNO3化学氧化碳毡的最佳时间为6 h,MFC最大输出功率密度为6 265.67mW/m3,与未改性相比,增加了2.4倍,电池内阻为358Ω;循环伏安测试进一步表明,碳毡化学改性时间为6 h时MFC的放电容量最大,且性能稳定;在最佳改性时间下MFC对COD和氨氮的最大去除率分别为91.2%和46.8%。Carbon felt was chemically modified with HNO3, and the ferric nitrate/activated carbon powder （Fe/C） catalyst prepared by impregnation was adsorbed on the modified carbon felt to obtain a Fe/C catalyst carbon felt air cathode. The effects of HNO3 oxidation time on the Fe/C catalyst dosage adsorbed on the modified carbon felt, the conductivity of the modified carbon felt air cathode, and the electricity generation performance and the discharge capacity of MFC were investigated. And the performance of MFC using Fe/C catalyst carbon felt air cathode with the optimal modification time for treating landfill leachate and the long-run stability of MFC were evaluated by steady discharge and cyclic vohammetry tests. The results showed that with the extension of HNO3 oxidation time of carbon felt, greater amount of Fe/C catalyst was adsorbed by the modified carbon felt, the conductivity of the modified carbon felt air cathode increased gradually and reached relative stabilization. The electricity generation performance of the modified carbon felt air cathode MFC was enhanced gradually, but reduced after achieving the peak value. Excessive catalyst adsorbed by the modified carbon felt could increase internal resistance and reduce the power density of MFC. The best time of HNO3 chemical oxidation carbon felt was 6 h, the maximum output power density was 6 265.67 mW/m3 , 2.4 times higher than the unmodified control. The internal resistance of the cell was 358Ω. The cyclic voltammetry further showed that 6 h modification time yielded the maximum discharge capacity of MFC with stable operation. The maximum removal of COD and ammonia in the best modified conditions was 91.2% and 46.8% respectively.

关 键 词：微生物燃料电池 碳毡空气阴极 化学改性 

分 类 号：X703[环境科学与工程—环境工程]