氢气储存
电化学
废水
铵
化学
化学工程
选择性
氢键
扩散
电极
离子键合
材料科学
无机化学
氢
分子
离子
催化作用
有机化学
废物管理
物理化学
物理
工程类
热力学
作者
Fubing Yao,Wanchao Li,Zhigong Liu,Xing Wu,Tianyu Gao,Yi Cheng,Lin Tang,Xin Min,Chong–Jian Tang
标识
DOI:10.1016/j.watres.2024.121114
摘要
Electrochemical ammonium (NH4+) storage (EAS) has been established as an efficient technology for NH4+ recovery from wastewater. However, there are scientific difficulties unsolved regarding low storage capacity and selectivity, restricting its extensive engineering applications. In this work, electrochemically selective NH4+ recovery from wastewater was achieved by coupling hydrogen bonding and charge storage with self-assembled bi-layer composite electrode (GO/V2O5). The NH4+ storage was as high as 234.7 mg N g−1 (>102 times higher than conventional activated carbon). Three chains of proof were furnished to elucidate the intrinsic mechanisms for such superior performance. Density functional theory (DFT) showed that an excellent electron-donating ability for NH4+ (0.08) and decrease of diffusion barrier (22.3%) facilitated NH4+ diffusion onto electrode interface. Physio- and electro-chemical results indicated that an increase of interlamellar spacing (14.3%) and electrochemical active surface area (ECSA, 388.9%) after the introduction of GO were responsible for providing greater channels and sites toward NH4+ insertion. Both non-ionic chemical-bonding (V5+=O‧‧‧H, hydrogen-bonding) and charge storage were contributed to the higher capacity and selectivity for NH4+. This work offers underlying guideline for exploitation a storage manner for NH4+ recovery from wastewater.
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