共查询到19条相似文献,搜索用时 62 毫秒
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PAN基活性炭纤维的表面及其孔隙结构解析 总被引:5,自引:0,他引:5
通过氮吸附等温线、X射线光电子能谱以及扫描电子显微镜(SEM)对聚丙烯腈(PAN-Polyacrylonitrile)-基活性炭纤维(ACF-Activated Carbon Fiber)的表面和孔隙结构进行了分析,结果表明吸附测量可以提供有关碳质吸附剂的孔结构复杂性;通过XPS对PAN基ACF的表面官能团的种类及含量进行了表征,由SEM对PAN基ACF的表面以及断面的孔隙结构进行了直接观察,提供了有关孔隙结构的直接证据。 相似文献
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活性炭纤维对挥发性有机物的吸附及其等温线的拟合 总被引:11,自引:0,他引:11
空气中挥发性有机化合物(VOC)严重危害人的身体健康,因而研究VOC的去除具有重要意义。本文研究了不同比表面积粘胶基活性炭纤维(ACF)对低浓度VOC,丁酮和苯的吸附,并用Freundilch方程和DR方程对吸附等温线进行了拟合。结果表明:当丁酮的浓度高于100ppm时,比表面积高的ACF吸附容量高;当浓度低于100ppm时,情形正好相反。在实验浓度范围,较高比表面积的活性炭纤维对苯的吸附表现出了较高的吸附容量。Freundlich方程和DR方程能很好地拟合吸附等温线。 相似文献
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In this paper, the adsorption characteristics of sodium tetraphenylborate(NaBPh4) on activated carbon at 298.2,303.2,308.2,313..2 and 323.2 K was studied.The results show that the adsorption isotherm of NaBPh4 on activated carbon at different temperatures could be described using Langrnuir equation. Furthermore, the standard Gibbs energy, enthalpy, entropy and hydrophobic interaction Gibbs energy for the adsorption of NaBPh4 on activated carbon were studied, and the result shows that the hydrophobic interaction of BPh4^- ion plays the most important role for the transfer of NaBPh4 from water to activated carbon surface. 相似文献
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活性炭纤维孔结构控制和表面改性 总被引:23,自引:0,他引:23
活性炭纤维(ACF-ActivatedCarbonFiber)是本世纪七十年代发展起来的纤维状吸附剂[1]。其吸附性能与表面积、细孔直径、细孔分布等物理结构密切相关,同时与其表面化学结构密不可分,本文综述介绍ACF的孔结构控制方法和表面化学改性与吸附性能的关系。 相似文献
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改性活性炭纤维吸附二甲胺水溶液的研究 总被引:2,自引:0,他引:2
采用气相氧化法制备改性ACF,以二甲胺水溶液为吸附对象,在静态吸附条件下研究了吸附时间、温度、ACF用量对吸附效果的影响,获得了吸附等温线;在动态吸附条件下测定了动态穿透曲线,并研究了ACF的再生方法。在ACF优化用量0.6g/100mL溶液条件下,对初始浓度256mg/L二甲胺溶液的吸附率为85%;吸附饱和的ACF用5%盐酸溶液进行再生时,再生率接近100%。 相似文献
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1.INTRODUCTIONDyewastewaterisakindofseriouspollutionsource.InthetraditionaltreatmentmethodsfordyewastewatergenerallytherearefourapproachesincludingelectricchargeneutraliZationofgelparticles,complexation(chelatation),redoxreaction,andbiochemicalcoagulationII~31.Recently,dyewastewaterhasbecomemoreconcentrated,moredifficulttodegradedbiochemically,andmorepoisonous,whichbringsaboutagreatchallengeforwatertreatment.AlthoughtheCOD(chemicaloxygendemand)mayfitthequalitystandardofwastewaterdischar… 相似文献
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活性碳纤维对银离子还原吸附能力的改进 总被引:8,自引:0,他引:8
活性碳纤维不仅对有机物有高的吸附容量,对贵金属离子也具有强的还原吸附能力,可将Pd(Ⅱ),Ag(Ⅰ),Au(Ⅲ)等离子还原为金属单质。因而可用于提取矿液或加收废液中的贵金属。由此,提高或改善贵金属在活性碳纤维上的还原吸附容量或分布形成,显得非常重要。本文研究了活性碳纤维制备条件、表面氧化改性、以有负载有机物等对活性碳纤维还原能力的影响。结果表明,(1)制备条件对剑麻基活性碳纤维的还原能力有很大的影响。用H3PO4或ZnCl2活化的活性碳纤维对银离子具有更高的还原吸附容量,分别可达250和700mg/g,约为水蒸汽活化剑麻基活性碳纤维对银离子还原吸附容量的2倍和5倍。(2)过氧化氢、高锰酸钾、或硝酸等无机氧化剂对活性碳纤维进行表面改性,也能提高活性碳纤维的还原能力。结果表明,虽然改性活性碳纤维的比表面积和孔体积下降10-20%左右,但基表面含氧量及含氧基团的种类发生了改变。这些改性活性碳纤维对Ag(NH3)2^ 的还原吸附量大幅度提高,可达550mg/g以上。推断表面改性在活性碳纤维表面创造了更多有利于碱性条件下发生氧化还原的活性点。(3)在活性碳纤维表面负载适当的有机物如亚甲基蓝、苯胺或对硝基苯酚,也能显著提高活性碳纤维对Ag(NH3)2^ 的还原吸附能力。 相似文献
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CHEN Shuixia JIN Ying LIANG Jin ZENG Hanmin Materials Science Institute Zhongshan University Guangzhou China Key Laboratory for Polymeric Composite Functional Materials of Education Ministry 《Chinese Journal of Reactive Polymers》2002,(2)
1. INTRODUCTION The adsorption and concentration of xenon has practical application interest in the purification of radioactive waste gas released from nuclear plant operation. Moreover, the monitor of xenon isotopic, derived from nuclear explosion or nu… 相似文献
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The adsorption of xenon from air has an interest in the monitoring of nuclear explosion oraccident, or in the treatment of nuclear waste gas. In this paper, the pore structure of several series ofactivated carbon fibers has been characterized. The adsorption properties of xenon on theseactivated carbon fibers under different temperatures have been studied in details. The results showthat the xenon adsorption amount on activated carbon fibers do not increase with specific surfacearea of adsorbents, but are closely related to their pore size distribution. Pores whose radius equal toor narrow than 0.4nm would be more advantageous to the adsorption of xenon. 相似文献
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CHEN Shuixia ZHANG Xiaoping ZENG Hanmin Key Laboratory for Polymeric Composite Functional Materials of Ministry of Education Materials Science Institute Zhongshan University Guangzhou China Department of Environmental Science Engineering South China University of Technology Guangzhou P. R. China 《Chinese Journal of Reactive Polymers》2002,(2)
1. INTRODUCTION Xenon isotopics are products of nuclear fission. The nuclear plant operation may release radioactive xenon to environment, thus result in serious damage to the environment and human health. Therefore, the adsorption and concentrating of x… 相似文献
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A series of sisal based activated carbon fibers were preqared with steam activation at temperature from 750℃ to 900℃.Their pore structures were characterized through their nitrogen adsorption isotherms at 77K using different theories.The results showed that t-plot method and DR-plot method could suitably be used to characterize the mesopore structure and the multi-stage distribution of pore size of activated carbon fibers.It also showed that the pore size widens with the increase of activation temperature. 相似文献
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活性碳纤维的结构修饰及其吸附氙性能的研究 总被引:3,自引:0,他引:3
活性炭纤维对氙的吸附容量与其孔结构密切相关,为了提高活性炭纤维对氙气的吸附容量,本文分别用亚甲基蓝、对硝基苯酚等有机物,或氯化钠、碘等无机化合物填充的方法修饰活性炭纤维的孔结构;以及利用高锰酸钾或硝酸等氧化处理修饰活性炭纤维的表面化学性质,同时,利用低温氮等温吸附表征了这些改性活性炭纤维的孔结构,以及通过光电子能谱表征了改性活性炭纤维的表面化学结构,上述化合物充填或氧化改性活性炭纤维对氙的吸附性能的研究结果表明,适量化合物填充,或合适浓度硝酸对活性炭纤维的表面处理,可以有效地修饰活性炭纤维的孔结构或改变活性炭纤维表面对氙的亲和力。因而可有效地提高改性活性炭纤维对氙的吸附容量。 相似文献