Adsorption of divalent mercury by copper/iron modified activated carbon

doi:10.16085/j.issn.1000-6613.2017-0984

Abstract

Abstract: With the development of industry, divalent mercury pollution as one of the environmental issues has been paid more and more attention around the world. In this paper, copper and iron-based[CuCl₂, FeCl₃, Cu(NO₃)₂] modified activated carbon were prepared by over-volume impregnation method. The effects of modified activated carbon prepared at different concentrations and calcination temperature on the removal of divalent mercury(HgCl₂) in simulated flue gas were investigated. Through the comparative experiments, both copper-based and iron-based activated carbon have a good adsorption effect on mercury-containing flue gas. The 0.01mol/L of copper chloride modified activated carbon calcined at 300℃ is the best removal of mercury chloride flue gas modified activated carbon, the adsorption capacity reached 4.55mg/g. On this basis, the physical and chemical characteristics were studied by using XRD, BET, SEM/EDS and XPS. It was proved that the adsorption of copper chloride and iron-based activated carbon is the result of the interaction between physical adsorption and chemical adsorption, and the corresponding explanation was given to provide some ideas for the follow-up scientific research.

Key words: flue gas, modified activated carbon, divalent mercury, gas-phase adsorption

摘要： 随着工业的发展，环境问题日趋严重，而二价汞污染作为环境问题之一受到越来越多的关注。本文采用过体积浸渍法制备了铜基和铁基[CuCl₂，FeCl₃，Cu （NO₃）₂]改性的活性炭，考察了不同浓度以及煅烧温度制备的改性活性炭对模拟烟气中二价汞（HgCl₂）脱除性能的影响。通过吸附穿透实验的对比研究得出，无论是铜基或铁基改性的活性炭都对含氯化汞烟气有很好的吸附效果，并且300℃焙烧的0.01mol/L的氯化铜改性活性炭是深度脱除含氯化汞烟气效果最好的改性活性炭，其吸附量达到了4.55mg/g。在此基础上，进一步利用了XRD、BET、XPS常用表征手段研究了改性前后活性炭的物理化学特性，证明了铜基、铁基改性活性炭吸附氯化汞都是物理吸附与化学吸附共同作用的结果，并给出了相应的解释，以期为后续的科学研究提供一定的思路。

关键词: 烟气, 改性活性炭, 二价汞, 气相吸附

CLC Number:

X701.3

HU Yanan, WANG Xueqian, NING Ping, CHENG Jinhuan, TAO Lei. Adsorption of divalent mercury by copper/iron modified activated carbon[J]. Chemical Industry and Engineering Progress, 2018, 37(02): 775-782.

胡亚楠, 王学谦, 宁平, 程金换, 陶雷. 铜铁基改性活性炭对烟气中二价汞的吸附[J]. 化工进展, 2018, 37(02): 775-782.

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