一种通过克服静电排斥的湿化和捕获策略,用于从低度污水中将酸盐电还原为氨
Yinghao Xue1, Qihui Yu2, Junhua Fang1
1State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|March 13, 2024
概括
电催化酸盐还原利用新的Cu@CuCoO2纳米岛,有效地从稀释废水中产生氨. 这种方法克服了低酸盐度和静电排斥的挑战,使可持续的氨合成成为可能.
科学领域:
- 环境化学环境化学
- 电触媒溶解是一种电触媒.
- 可持续的合成 可持续的合成
背景情况:
- 通过电催化酸盐还原 (NO3RR) 生产氨提供了零碳的途径,但受到废水中的稀酸盐和静电排斥的阻碍.
- 高效的NO3RR对于可持续的氨合成至关重要,特别是在农业等分散的应用中.
研究的目的:
- 开发一种节能电催化系统,用于从稀释酸盐流中生产氨.
- 用一个新的Cu@CuCoO2纳米岛催化剂来研究酸盐减少的机制.
- 为了证明这种系统在农业地区的氨自给自足的实际应用.
主要方法:
- 在支材料上制造水友性Cu@CuCoO2纳米岛.
- 在模拟稀释废水中用电催化剂减少酸盐.
- 介质识别和理论计算以阐明反应机制.
- 性能评估包括氨的选择性,酸盐的转化和能源消耗.
主要成果:
- Cu@CuCoO2纳米岛催化剂有效丰富了酸盐离子并促进了它们的减少.
- 最佳的反应途径涉及*NO的N侧化,防止N-N二聚体的形成.
- 在稀释酸盐流中 (48.9 mg-N/L) 实现了93.5%的NH3选择性,96.1%的酸盐转化和低能耗 (0.079 kWh/g NH3).
结论:
- 开发的电催化系统有效地将稀释酸盐转化为氨,性能优于现有的方法.
- Cu@CuCoO2催化剂的酸盐丰富能力及其独特的氧化还原特性是高效NO3RR的关键.
- 这项技术为农业环境中自给自足的氨生产提供了一个可行的平台.
相关概念视频
Electrodeposition
633
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
633
2° Amines to N-Nitrosamines: Reaction with NaNO2
4.2K
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
4.2K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
3.8K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.8K
Preparation of Amines: Reduction of Oximes and Nitro Compounds
3.6K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
3.6K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
3.3K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.3K
Colloidal precipitates
576
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
576


