Effective nitric oxide removal from flue gas using UV / H 2 O 2 solution catalyzed by Fe 3 O 4 @ FeEDTA

作者：Ziwei Liu, Feiqiang He, Limin Zhou, Zhuyao Li, Lirong Zhong, Jianhua Ding · 发表于：Journal of Chemical Technology & Biotechnology · 年份：2023 · DOI：10.1002/jctb.7396 · 被引用次数：8 · 研究领域：Industrial Gas Emission Control、Catalytic Processes in Materials Science、Gas Sensing Nanomaterials and Sensors

Abstract BACKGROUND How to control NO x emission in flue gas economically and efficiently is the focus in the field of energy and environment in the world. In this work, Fe 3 O 4 ‐magnetic microspheres were employed as the matrix with loading FeEDTA (where EDTA is ethylenediaminetetraacetic acid) to prepare magnetic denitrification absorbent Fe 3 O 4 @FeEDTA. The performance of nitric oxide (NO) removal using Fe 3 O 4 @FeEDTA dispersed in H 2 O 2 solution with ultraviolet (UV) was first investigated. RESULTS The results showed that Fe 3 O 4 @FeEDTA could be used as a good catalytic oxidation denitrification agent. Increasing H 2 O 2 concentration and O 2 concentration could promote NO absorption. NO removal efficiency increased as pH value increased from 1.5 to 3.0, then decreased when pH continued to increase. The elevated temperature was conducive to NO removal. CO 2 hardly affected the removal of NO, while SO 2 with high concentration was not conducive to NO absorption. In addition, the NO removal mechanism was preliminarily analyzed with X‐ray photoelectron spectrometry, electron spin resonance and ion chromatography. The mechanism study indicated that NO removal by Fe 3 O 4 @FeEDTA/H 2 O 2 was a catalysis–complexation–oxidation–absorption process, in which •OH was determined to be the main oxidizing species, and NO captured by Fe(II)EDTA was mainly oxidized by •OH to NO 3 − . CONCLUSION The catalytic activity of Fe 3 O 4 @FeEDTA could maintain stability during the repeat...