Studies on Oxidant - Fe2O3 Composite Adsorbent and its Enhanced Removal of Gas-phase Arsenic

被引：0
作者：
Wang P. [1 ]
Zhang K. [1 ]
Wang C. [1 ]
Zhang K. [1 ]
机构：
[1] Beijing Key Laboratory of Pollutant Monitoring and Control in Thermoelectric Production Process (North China Electric Power University), Changping District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 15期
基金：
中国国家自然科学基金;
关键词：
Adsorption; Arsenic; Catalytic oxidation; Fe[!sub]2[!/sub]O[!sub]3[!/sub; NaBr;
D O I：
10.13334/j.0258-8013.pcsee.182292
中图分类号：
学科分类号：
摘要：
The oxidant-Fe2O3 composite adsorbents including H2O2-Fe2O3, NaClO-Fe2O3 and NaBr-Fe2O3 were prepared by chemical impregnation method. The oxidative adsorption of gas-phase As2O3 by Fe2O3 and the above three composite adsorbents was investigated through using the self-made arsenic generation and fixed bed adsorption reaction device. The total amount and valence of arsenic in the adsorbed products were detected nondestructively by high performance liquid chromatography-hydride generation-atomic fluorescence spectrometry. The mechanism of catalytic oxidation of As(III)/As(V) by Fe2O3 and NaBr-Fe2O3 adsorbents was deeply investigated. The results show that the adsorption capacity of NaBr-Fe2O3 is significantly enhanced, and it is about 2.3 times of that of Fe2O3. However, the adsorption properties of H2O2-Fe2O3 and NaClO-Fe2O3 are not improved. Both Fe2O3 and NaBr-Fe2O3 could oxidize As(III) to As(V), and the higher the Br- loading, the stronger the catalytic oxidation ability, and the stronger the adsorption capacity. The oxidative adsorption of gas-phase arsenic by Fe2O3 original sample follow the Mars-Maessen lattice oxygen oxidation mechanism. As(III) oxidation could only be carried out in flue gas with the presence of oxygen. However, NaBr-Fe2O3 adsorbent could still oxidize As(III) in the absence of O2, the reason is that the strong electronegativity of Br- excites the activity of Fe-O bond of Fe2O3, which makes it easy to release active oxygen, thus improving the catalytic oxidation and adsorption activity, and Fe2O3 itself is reduced to Fe3O4. © 2019 Chin. Soc. for Elec. Eng.
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页码：4497 / 4503
页数：6
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