[1]佘敏,段钰锋,朱纯,等.CO2/H3PO4活化与NH4Br改性稻壳焦的脱汞性能实验研究[J].东南大学学报(自然科学版),2014,44(2):321-327.[doi:10.3969/j.issn.1001-0505.2014.02.017]
 She Min,Duan Yufeng,Zhu Chun,et al.Experimental study on mercury adsorption performances of rice husk chars activated by CO2/H3PO4 and modified by NH4Br[J].Journal of Southeast University (Natural Science Edition),2014,44(2):321-327.[doi:10.3969/j.issn.1001-0505.2014.02.017]
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CO2/H3PO4活化与NH4Br改性稻壳焦的脱汞性能实验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第2期
页码:
321-327
栏目:
环境科学与工程
出版日期:
2014-03-20

文章信息/Info

Title:
Experimental study on mercury adsorption performances of rice husk chars activated by CO2/H3PO4 and modified by NH4Br
作者:
佘敏段钰锋朱纯洪亚光周强王双群
东南大学能源热转换及其过程测控教育部重点实验室, 南京 210096; 东南大学能源与环境学院, 南京 210096
Author(s):
She Min Duan Yufeng Zhu Chun Hong Yaguang Zhou Qiang Wang Shuangqun
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
School of Energy and Environment, Southeast University, Nanjing 210096, China
关键词:
活化 改性 稻壳焦 脱汞 吸附剂
Keywords:
activation modification rice husk char mercury removal sorbent
分类号:
X511
DOI:
10.3969/j.issn.1001-0505.2014.02.017
摘要:
以生物质稻壳为原料,采用CO2,H3PO4活化方法,并经NH4Br溶液改性,分别制备了稻壳热解焦、活化焦和改性焦,并将其作为脱汞吸附剂.采用N2吸附/脱附、SEM-EDS、FTIR等方法研究吸附剂的微观物理化学特性,结果表明:CO2活化使稻壳焦的孔隙结构显著改善,增强了吸附剂对汞的物理吸附能力;H3PO4活化使稻壳焦表面生成大量酸性含氧官能团,有利于汞的化学吸附;NH4Br改性使Br元素有效负载到稻壳焦表面,促进了单质汞向氧化态汞的转化.固定床汞吸附实验结果表明:改性后的稻壳热解焦与活化焦的脱汞效率分别提高了60%与90%,实验120 min后,CO2,H3PO4活化改性焦的汞吸附效率仍分别保持在90%与80%以上.生物质稻壳经CO2/H3PO4活化和NH4Br溶液改性后可作为燃煤电厂烟气喷射脱汞的廉价高效吸附剂.
Abstract:
Rice husk was pyrolyzed, activated by CO2 and H3PO4 and modified by NH4Br separately to prepare rice husk char, rice husk activated char and rice husk modified char as sorbents for removal of mercury. Microstructures of the prepared rice husk chars were characterized based on instrumentations of nitrogen adsorption, SEM-EDS(scanning election microscope energy dispersive spectrometer)and FTIR(Fourier transform infrared). The experimental results indicate that CO2 activation benefits a more developed microporous structure with higher physisorption capacity; H3PO4 activation produces a large number of surface acidic oxygen functional groups on the surface of rice husk chars, which are beneficial for the mercury chemisorption; As shown in the EDS spectrum after treated by NH4Br, bromine is loaded on the rice husk char surface, indicating that elemental mercury will be easily transformed into the oxidized state. Mercury adsorption capacity was evaluated in a fixed bed. The results are summed as follows: after modification, the Hg0 removal efficiency of the rice husk pyrolyzed char is improved over 60% while the activated char is increased by 90%. The mercury adsorption efficiency of CO2 and H3PO4 activated cokes remains above 90% and 80%, respectively, after 120 min of adsorption. The modified CO2 and H3PO4 activated rice husk chars can be used as the high-efficient and low-cost sorbents for the demercuration process of activated carbon injection applied in coal-fired power plants.

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备注/Memo

备注/Memo:
收稿日期: 2013-07-01.
作者简介: 佘敏(1990—),女,博士生;段钰锋(联系人),男,博士,教授,博士生导师,yfduan@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51376046,51076030)、江苏省环保科研课题基金资助项目(201113)、江苏省产学研联合创新资金资助项目(BY2013073-10)、江苏省研究生科研创新计划资助项目(CXZZ13_0093)、中央高校基本科研业务费专项资金资助项目.
引用本文: 佘敏,段钰锋,朱纯,等.CO2/H3PO4活化与NH4Br改性稻壳焦的脱汞性能实验研究[J].东南大学学报:自然科学版,2014,44(2):321-327. [doi:10.3969/j.issn.1001-0505.2014.02.017]
更新日期/Last Update: 2014-03-20