普鲁士蓝
废水
铵
离子
分离(统计)
化学
环境科学
材料科学
环境工程
电极
电化学
计算机科学
有机化学
物理化学
机器学习
作者
Weikun Chen,Paul Akinyemi,Taeyoung Kim
出处
期刊:Environmental Science and Technology Letters
[American Chemical Society]
日期:2024-02-27
标识
DOI:10.1021/acs.estlett.3c00932
摘要
Wastewater treatment plants represent a centralized collection point of various resources, including ammonium, that could be recovered for the production of nitrogen fertilizer. Here, we show the use of copper hexacyanoferrates (CuHCFs) as ion-conducting channels for the selective recovery of ammonium from wastewater. This model Prussian blue analogue was deposited at the surface of a cation exchange membrane (CEM) by a simple layer-by-layer precipitation method. The resulting CuHCF-CEM showed a selectivity of 5.0 ± 0.4 for NH4+ relative to Na+ using a binary mixture of synthetic wastewater (5 mM NH4Cl, 20 mM NaCl, 0.17 mA cm–2), which was nearly 5 times greater than the bare CEM. The improved selectivity was attributed to the CuHCF layer wherein NH4+ could be migrated faster as well as more favorably occupied relative to Na+. The selectivity of CuHCF-CEM for NH4+ was maintained relatively high compared with that of CEM in the presence of competing cations in a real domestic wastewater sample. This proof-of-concept study shows that selective ion-conducting channels of CuHCFs can provide a means to ammonia recovery from wastewater in electro-driven membrane processes.
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