Efficient purification and chemical energy recovery from urine by using a denitrifying fuel cell
Efficient purification and chemical energy recovery from urine by using a denitrifying fuel cell
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利用反硝化燃料电池对尿液进行高效净化和化学能回收
DOI：
10.1016/j.watres.2018.12.066
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发表时间：
2019
期刊：
影响因子：
12.8
通讯作者：
Baoxue Zhou
中科院分区：
文献类型：
--
作者：
Zhaoxi Shen;Jing Bai;Yan Zhang;Jinhua Li;Tingsheng Zhou;Jiachen Wang;Qunjie Xu;Baoxue Zhou
尿液是一种重要的生物质资源，其过量排放会导致严重的水体氮污染甚至富营养化。在这项研究中，我们设计了一个创新的净化燃料电池（DFC）在光照下净化尿液和转换其化学能为电能。其中心思想包括：1）在阳极上，氯自由基（Clradical点）和羟基2）在阴极上，Pd/Au/NF将电池中产生的NO2-或NO3-选择性还原为N2和微量的NH 4 +; 3）Cl自由基点将NH 4+进一步氧化为N2，然后通过阳极和阴极之间的连续氧化还原回路最终去除总氮（TN）; 4）自偏压多晶硅/WO 3光阳极加强了电荷的分离和迁移。结果表明，DFC具有高效的产电率和几乎完全的脱氮性能：功率密度为2.24 mW cm-2，对人工尿液的总氮和总有机碳（TOC）去除率分别为99.02%和50.76%;功率密度为2.51 mW cm-2时，对实际尿液中TN和TOC的去除率分别为98.60%和54.55%。该研究提出了一种潜在的和环境友好的方法，通过使用新型的DFC净化尿液和发电。
Urine is a major biomass resource, and its excessive discharge would lead to severe aquatic nitrogen pollution and even eutrophication. In this study, we designed an innovative denitrifying fuel cell (DFC) under illumination to purify urine and convert its chemical energy into electricity. The central ideas include the following: 1) on the anode, chlorine radicals (Clradical dot) and hydroxyl (HOradical dot) radicals were induced to react with amine or ammonia in urine into N2, and to mineralize organics into CO2, respectively; 2) on the cathode, NO2−or NO3−generated in the cell was selectively reduced to N2and tiny NH4+by Pd/Au/NF; 3) NH4+was further oxidized to N2by Clradical dot according to process 1), then the total nitrogen (TN) was ultimately removed by a continuous redox loop between anode and cathode; 4) the separation and migration of charges were strengthened by a self-bias poly-Si/WO3photoanode. Result indicated that the DFC showed an efficient yield of electricity and almost completely N-removing properties: power density of 2.24 mW cm−2, total nitrogen and total organic carbon (TOC) removal efficiency, respectively 99.02% and 50.76% for artificial urine; and power density of 2.51 mW cm−2, TN and TOC removal efficiency, respectively 98.60% and 54.55% for actual urine. The study proposes a potential and environment-friendly approach by using novel DFC to purify urine and generate electricity.