新型改性吸附剂制备、表征及脱除单质汞的实验研究
Synthesis and characterization of novel modified sorbents and their performance for elemental mercury removal
查看参考文献19篇
|
文摘
|
采用KBr和KI对高岭土、沸石、膨润土和壳聚糖进行改性,利用VM3000在线测汞仪作为检测手段,在固定床台架上进行脱Hg~0实验.采用N_2吸附/脱附、X射线荧光探针(XRF)和傅里叶变换红外光谱(FTIR)等分析仪对吸附剂进行表征.分析发现改性后吸附剂的孔隙和比表面积降低;碘离子进入了膨润土的内部,碘、硫酸和壳聚糖中的氨基发生了化学反应.脱汞实验表明,与高岭土和沸石相比,膨润土因其独特结构而具有良好的脱汞效果.适量硫酸的加入可以极大地提高壳聚糖类吸附剂的脱汞效率;与溴改性吸附剂相比,碘改性吸附剂更能够大大提高吸附剂的脱汞效率;适当提高吸附温度可以提高其脱汞效率;因改性膨润土和壳聚糖不同的物理化学特性,水蒸气的加入使得它们的脱汞效率出现相反的趋势. |
|
其他语种文摘
|
Adsorption experiments of vapor-phase elemental mercury were carried out by using bromine (Br) - and iodine (I) -modified kaolin, zeolite, bentonite and chitosan (CTS) in a laboratory-scale fixed-bed reactor.VM3000 online mercury analyzer was used to detect the inlet and outlet Hg~0 concentrations.The characterizations of the sorbents were analyzed by using the method of nitrogen (N_2) adsorption/desorption, X-ray fluorescence (XRF) technique and Fourier transform infra-red spectroscopy (FTIR).It was observed that the porosity and specific surface area decreased after modification.The FTIR spectra demonstrated that iodine was found in the internal layer of bentonite, and the chemical reactions of iodine and sulfate ion with the amide of CTS occurred.Fixed-bed adsorber tests showed that compared with kaolin and zeolite, the modified bentonite exhibited excellent mercury capture because of its unique structure.Mercury removal efficiency of CTS sorbents could be significantly enhanced when an appropriate amount of H_2SO_4 was added.Generally, the iodine-modified sorbents demonstrated higher mercury capture efficiency than that of bromine-modified sorbents.The mercury removal efficiencies of these sorbents increased with temperature.Bentonite' s capacity for mercury uptake decreased with the presence of moisture while chitosan's capacity for mercury uptake exhibited an opposite tendency due to their absolutely different physicochemical properties. |
|
来源
|
化工学报
,2009,60(6):1546-1553 【核心库】
|
|
关键词
|
壳聚糖
;
膨润土
;
脱汞
;
碘
;
改性
|
|
地址
|
华中科技大学, 煤燃烧国家重点实验室, 湖北, 武汉, 430074
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
0438-1157 |
|
学科
|
化学工业 |
|
基金
|
国家自然科学基金
;
国家教育部新世纪优秀人才支持计划
|
|
文献收藏号
|
CSCD:3506209
|
参考文献 共
19
共1页
|
|
1.
Uddin M A. Role of SO_2 for elemental mercury removal from coal combustion flue gas by activated carbon.
Energy & Fuels,2008,22(1):2284-2289
|
被引
19
次
|
|
|
|
|
2.
Lee S S. Novel sorbents for mercury emissions control from coal-fired power plants.
Journal of the Chinese Institute of Chemical Engineering,2008,39(22):137-142
|
被引
12
次
|
|
|
|
|
3.
郭欣. 300MW煤粉锅炉烟气中汞形态分析的实验研究.
中国电机工程学报,2004,24(6):185-188
|
被引
54
次
|
|
|
|
|
4.
王起超. 中国燃煤汞排放量估算.
中国环境科学,1999,19(4):318-321
|
被引
121
次
|
|
|
|
|
5.
任建莉. 新型吸附剂脱除烟气中气态汞的试验研究.
中国电机工程学报,2007,27(2):48-53
|
被引
41
次
|
|
|
|
|
6.
任建莉. 钙基类吸附剂脱除烟气中气态汞的试验研究.
燃料化学学报,2006,34(5):557-561
|
被引
22
次
|
|
|
|
|
7.
Zeng H C. Removal of elemental mercury from coal combustion flue gas by choride-impregnated activated carbon.
FUEL,2004,83(1):143-146
|
被引
35
次
|
|
|
|
|
8.
Vidic R D. Vapor-phase elemental mercury adsorption by activated carbon impregnated with chloride and chelating agents.
CARBON,2001,39(1):3-14
|
被引
21
次
|
|
|
|
|
9.
Lee S J. Removal of gas-phase elemental mercury by iodine-and choride-impregnated activated carbon.
Atmosphere Environment,2004,38(29):4887-4893
|
被引
34
次
|
|
|
|
|
10.
Liu W. Optimization of sulfur impregnation protocol for fixed-bed application of activated carbon-based sorbents for gas-phase mercury removal.
Environmental Science and Technology,1998,32(4):531-538
|
被引
16
次
|
|
|
|
|
11.
Jurng J S. Mercury removal from incineration flue gas by organic and inorganic adsorbents.
CHEMOSPHERE,2002,47(9):907-913
|
被引
11
次
|
|
|
|
|
12.
Guijarro M I. Effect of morphology of sulfurized materials in the retention of mercury from gas streams.
Industrial and Engineering Chemistry Research,1998,37(3):1088-1094
|
被引
1
次
|
|
|
|
|
13.
蒋挺大.
甲壳素,2003
|
被引
87
次
|
|
|
|
|
14.
Eren E. An investigation of Cu(Ⅱ)adsorption by raw and acid-activated bentonite:a combined potentiometric,thermodynamic,XRD,IR,DTA study.
Journal of Hazardous Materials,2008,151(2/3):682-691
|
被引
20
次
|
|
|
|
|
15.
朱再盛. Hg~(2+)-交联壳聚糖配合物的合成与表征.
化学通报,2007,70(5):388-391
|
被引
5
次
|
|
|
|
|
16.
Hutson N D. Mercury capture on fly ash and sorbents:the effects of coal properties and combustion conditions.
Water Air Soil Pollution:Focus,2008,8(3/4):323-331
|
被引
4
次
|
|
|
|
|
17.
王声宇. 壳聚糖硫酸酯的合成及其抑菌作用.
功能高分子学报,2007,19/20(4):440-442
|
被引
5
次
|
|
|
|
|
18.
Huggins F E. XAFS characterization of mercury captured from combustion gases on sorbents at low temperatures.
Fuel Processing Technology,2003,82(2/3):167-196
|
被引
15
次
|
|
|
|
|
19.
Gale T K. Mechanisms governing the fate of mercury in coal-fired power systems.
Fuel Processing Technology,2008,89(2):139-151
|
被引
13
次
|
|
|
|
|
了解气象卫星更多信息，请访问