磁性Fe3O4-Ag复合纳米颗粒吸附剂脱汞性能实验研究

doi:10.16085/j.issn.1000-6613.2017.03.044

化工进展 ›› 2017, Vol. 36 ›› Issue (03): 1101-1106.DOI: 10.16085/j.issn.1000-6613.2017.03.044

磁性Fe₃O₄-Ag复合纳米颗粒吸附剂脱汞性能实验研究

孙青柯¹, 黄亚继¹, 王靓¹, 关正文², 李睦², 周军², 王烨²

1 东南大学能源热转换及其过程测控教育部重点实验室, 江苏南京 210096;
2 中建中环工程有限公司, 江苏南京 210008

收稿日期:2016-07-07 修回日期:2016-11-15 出版日期:2017-03-05 发布日期:2017-03-05
通讯作者: 黄亚继。
作者简介:孙青柯(1991-),男,硕士研究生,主要从事燃煤污染控制研究工作。E-mail:418686445@qq.com。
基金资助:
江苏省环保科研课题（2015013）及高等学校博士学科点专项科研基金项目（20130092110007）。

Experimental study on mercury removal efficiencies of magnetic Fe₃O₄-Ag composite nanoparticles

SUN Qingke¹, HUANG Yaji¹, WANG Liang¹, GUAN Zhengwen², LI Mu², ZHOU Jun², WANG Ye²

1 Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China;
2 China Construction Power and Environment Engineering Co., Ltd., Nanjing 210008, Jiangsu, China

Received:2016-07-07 Revised:2016-11-15 Online:2017-03-05 Published:2017-03-05

摘要/Abstract

摘要：

目前Fe₃O₄纳米颗粒由于其优秀的物理、化学性能及特有的磁性能，在吸附剂领域有着很好的应用前景。为此，使用共沉淀法制备Fe₃O₄纳米颗粒，以3-氨丙基三乙氧硅烷（APTES）为修饰剂，根据甲酸钠与乙酸银的特异性反应，制备出磁性Fe₃O₄-Ag复合纳米颗粒吸附剂。通过固定床吸附实验考察吸附剂对模拟烟气中汞的脱除能力，讨论其对汞的脱除机理。研究结果表明：磁性Fe₃O₄-Ag复合纳米颗粒吸附剂可脱除90%以上模拟烟气中的汞，且具有很好的抗酸性气体性能。包裹Ag提高了纳米颗粒的稳定性，提高了纳米颗粒的比表面积和总孔容积，且Ag可以与元素汞发生汞齐反应。温度的提高会抑制吸附剂对汞的吸附及汞齐反应的进行，降低吸附剂的脱汞能力。吸附剂对汞的脱除机理为物理吸附为主，且高温下被吸附的汞会从吸附剂中脱附。吸附剂还具有很好的再生性能，重复脱附吸附多次后仍保持很好的脱汞能力。

关键词: 四氧化三铁, Ag复合, 纳米粒子, 吸附剂, 固定床, 脱汞

Abstract:

Fe₃O₄ nanoparticles have great application prospect as sorbents because its excellent physical, chemical and uniquely magnetic properties. CH₃COOAg was added in Fe₃O₄ nanoparticles solution modified by APTES to form coordination composite,and then Ag+ was reduced to Ag by HCOONa. Thus, Fe₃O₄-Ag magnetic composite nanoparticles was made. This study investigated the mercury removal efficiencies of Fe₃O₄-Ag nanoparticles and its mechanism. Fe₃O₄-Ag nanoparticles have high mercury removal efficiency and good performance against acidic gases because the stability,the specific surface and the pore volume of nanoparticles are improved. The mercury removal efficiency decreased with increasing temperature because the adsorption process and the amalgam reaction were inhibited. When Fe₃O₄-Ag nanoparticles were used to remove mercury,Hg⁰ was adsorbed in the nanoparticles physically and Hg⁰ can be desorbed at high temperature. Fe₃O₄-Ag nanoparticles were also reproducible since they had high mercury removal efficiency after several times of desorption.

Key words: Fe₃O₄, Ag compound, nanoparticles, sorbents, fixed-bed, mercury removal

中图分类号:

X701

孙青柯, 黄亚继, 王靓, 关正文, 李睦, 周军, 王烨. 磁性Fe₃O₄-Ag复合纳米颗粒吸附剂脱汞性能实验研究[J]. 化工进展, 2017, 36(03): 1101-1106.

SUN Qingke, HUANG Yaji, WANG Liang, GUAN Zhengwen, LI Mu, ZHOU Jun, WANG Ye. Experimental study on mercury removal efficiencies of magnetic Fe₃O₄-Ag composite nanoparticles[J]. Chemical Industry and Engineering Progress, 2017, 36(03): 1101-1106.

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磁性Fe₃O₄-Ag复合纳米颗粒吸附剂脱汞性能实验研究

Experimental study on mercury removal efficiencies of magnetic Fe₃O₄-Ag composite nanoparticles

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