文献类型：期刊文献

中文题名：Fe^(3+)增强氢氧化钙固硫效率:氧化、催化双重机制

英文题名：Enhanced Sulfur Fixation Efficiency of Calcium Hydroxide by Fe^(3+):Dual Mechanisms of Oxidation and Catalysis

作者：李中意[1];刘彪[1];陈茜[1];李春忠[1];姜海波[1]

机构：[1]华东理工大学材料科学与工程学院,超细材料制备与应用教育部重点实验室,上海多级结构纳米材料工程技术研究中心,上海200237

年份：2026

卷号：41

期号：5

起止页码：637

中文期刊名：无机材料学报

外文期刊名：Journal of Inorganic Materials

收录：;EI(收录号：20262120771183);WOS:【SCI-EXPANDED(收录号:WOS:001777876800006)】；北大核心:【北大核心2023】；

基金：National Natural Science Foundation of China (22578118, 22278136, U22B20143) ; Fundamental Research Funds for the Central Universities

语种：中文

中文关键词：二氧化硫;氢氧化钙;钙铁脱硫剂;固硫效率;氧化;催化

外文关键词：sulfur dioxide;calcium hydroxide;calcium-iron desulfurizer;sulfur fixation efficiency;oxidation;catalysis

摘要：二氧化硫(SO_(2))是一种常见的大气污染物,对环境和人体健康造成严重危害。目前,氢氧化钙(Ca(OH)_(2))作为一种常用的脱硫剂,因其制备简单、成本低廉且脱硫效果较好而被广泛应用。然而,如何进一步提高其固硫效率仍是研究重点。本工作在氧化钙(CaO)消化过程中加入氢氧化铁(Fe(OH)3),分步制备了钙铁脱硫剂,并研究了其脱硫性能。结果表明,钙铁脱硫剂的固硫效率显著提高,与纯Ca(OH)_(2)相比,固硫效率最大提升了26.16%。加入Fe^(3+)改变了Ca(OH)_(2)的形貌,使其表面更加粗糙,增加了孔隙和裂缝,从而提供了更多的反应活性位点。此外,根据X射线光电子能谱测试结果,脱硫后样品中S^(6+)的比例从9.71%(纯Ca(OH)_(2))提高到33.33%(钙铁脱硫剂),并且脱硫前钙铁脱硫剂中均是Fe^(3+),脱硫后Fe^(2+)和Fe^(3+)分别占68.42%和31.58%,其中35.56%的硫元素被氧化,64.44%的硫元素被催化,说明Fe^(3+)的氧化以及催化作用促进了S4+向S^(6+)转化,进一步提高了固硫效率。本工作为提高Ca(OH)_(2)固硫效率提供了一种有效的方法,对选择工业烟气SO_(2)脱除材料具有重要的借鉴意义。
Sulfur dioxide(SO_(2))is a major air pollutant that poses severe hazards to environment and human health.Currently,calcium hydroxide(Ca(OH)_(2))is widely used as a common desulfurizing agent due to its simple preparation process,low cost and relatively good desulfurization performance.However,how to further improve its sulfur fixation efficiency remains unknown.Here,a novel calcium-iron desulfurizing agent was prepared in a stepwise manner by incorporating ferric hydroxide during hydration process of calcium oxide(CaO),and then its desulfurization performance was investigated.The results demonstrated that sulfur fixation efficiency of the calcium-iron desulfurizing agent was significantly enhanced,increasing by 26.16%compared to the maximum sulfur fixation efficiency of pure Ca(OH)_(2).Addition of Fe^(3+)modified the morphology of Ca(OH)_(2),rendering its surface much rougher with an increasing of pores and cracks.This morphological change provided more active sites for the desulfurization reaction.X-ray photoelectron spectroscopy analysis revealed that after desulfurization the proportion of hexavalent sulfur(S^(6+))in the sample increased from 9.71%(pure Ca(OH)_(2))to 33.33%(calcium-iron desulfurizing agent).Experiment study revealed that before desulfurization,all iron in the calcium-iron desulfurizing agent was in the form of Fe^(3+),but after desulfurization,Fe^(2+)amazingly accounted for 68.42%while Fe^(3+)only accounted for 31.58%of the total calcium-iron agent.Calculations based on these data indicated that 35.56%sulfur was oxidized while 64.44%was catalyzed.These calculation findings confirmed that oxidation and catalytic effects of the iron promoted the conversion of tetravalent sulfur(S4+)to S^(6+),thereby further improving the sulfur fixation efficiency.This study provides a promising approach to enhance the sulfur fixation efficiency of Ca(OH)_(2)and an effective material for removing sulfur dioxide from industrial flue gas.