Ammonia-selective recovery from anaerobic digestate using electrochemical ammonia stripping combined with electrodialysis

Aung, Shine Lin; Choi, Jihyeok; Cha, Hoyoung; Woo, Gaeun; Song, Kyung Guen

doi:10.1016/j.cej.2023.147949

Cited by 10 publications

(1 citation statement)

References 53 publications

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“…CA and operando FITR spectroscopic measurements are used to determine that TTAB-CNT, which provides the greatest hydrophobicity of the tested surfactants, allows fewer interfacial water molecules to reach the CNT surface, thereby significantly inhibiting the competitive HER and promoting NH 3 selectivity. The produced NH 3 could be further recovered by struvite precipitation, electrochemical stripping, capacitive deionization, and other routes. Overall, this work highlights the importance of controlling the hydrophobicity of the microenvironment of electrocatalysts to maximize the selective generation of NH 3 , which can be applied to a broad range of heterogeneous catalytic systems that involve the control of selectivity.…”

Section: Environmental Implicationsmentioning

confidence: 99%

Selective Nitrate Electroreduction to Ammonia on CNT Electrodes with Controllable Interfacial Wettability

Liu,

Zheng,

Ren

et al. 2024

Environ. Sci. Technol.

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The development of electrocatalysts that can efficiently reduce nitrate (NO 3 − ) to ammonia (NH 3 ) has garnered increasing attention due to their potential to reduce carbon emissions and promote environmental protection. Intensive efforts have focused on catalyst development, but a thorough understanding of the effect of the microenvironment around the reactive sites of the catalyst is also crucial to maximize the performance of the electrocatalysts. This study explored an electrocatalytic system that utilized quaternary ammonium surfactants with a range of alkyl chain lengths to modify an electrode made of carbon nanotubes (CNT), with the goal of regulating interfacial wettability toward NO 3 − reduction. Trimethyltetradecylammonium bromide with a moderate alkyl chain length created a very hydrophobic interface, which led to a high selectivity in the production of NH 3 (∼87%). Detailed mechanistic investigations that used operando Fourier-transform infrared (FTIR) spectroscopy and online differential electrochemical mass spectrometry (DEMS) revealed that the construction of a hydrophobic modified CNT played a synergistic role in suppressing a side reaction involving the generation of hydrogen, which would compete with the reduction of NO 3 − . This electrocatalytic system led to a favorable process for the reduction of NO 3 − to NH 3 through a direct electron transfer pathway. Our findings underscore the significance of controlling the hydrophobic surface of electrocatalysts as an effective means to enhance electrochemical performance in aqueous media.

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Section: Environmental Implicationsmentioning

confidence: 99%