共查询到18条相似文献,搜索用时 156 毫秒
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超大比表面积活性炭纤维对氮的多段吸附机理 总被引:8,自引:0,他引:8
研究了超大比表面积ACF(K-ACF)对氮的多吸附机理。通过各样品孔径结构(基于DFT)和吸附过程(DR曲线描述)比较分析,探讨不同孔径结构对K-ACF的多段吸附的影响,结合前人工作提出了超大比表面积ACF的多段充填机理,并重点分析了极微孔中的吸附过程(第一吸附段),解释了K-ACF的DR曲线偏离理想DR曲线的原因。 相似文献
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SO2在含氮沥青基活性炭纤维上的脱除:Ⅰ含氮沥青基活性炭纤维的脱 … 总被引:12,自引:1,他引:11
由水和氨混合物活化制得的不同比表面积及氮含量的含氮沥青基活性炭纤维(PACF(NH3))在O2和H2O存在下脱除SO2的能力进行了研究。XPS结果表明,PACF(NH3)表面的含氮官能团主要为类吡咯氮,类吡啶氮及铵盐,它们的主要作用是增强对水的吸附,当比表面积相近,氮含量增加时或者氮含量相近,比表面积增大时,均导致PACF(NH3)的脱硫能力增强,这与PACF(NH3)对水的吸附量增加有关。 相似文献
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活性炭纤维的制备及其对硫醇的吸附脱除性能 总被引:5,自引:0,他引:5
研究了沥青基活性炭纤维(PACF)的制备条件,如活化温度、活化时间对产品收率、比表面积以及对正充醇吸附性能的影响。结果表明,单纯的PACF不能吸附己烷中的正丁硫醇,PACF负载钴盐后,可用于脱除硫醇,用于负载钴盐的PACF的活化温度对脱除硫醇效果无影响,但活化时间必须在90min以上,才能使硫醇含量降到10ppm以下。 相似文献
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活性碳纤维吸附的研究:Ⅱ—磷酸活化活性碳纤维的制备工艺与吸附性能… 总被引:5,自引:1,他引:4
本文研究了磷酸活化ACF的得率,比表面积和吸附性能的关系,发现磷酸活化ACF得率高,对有机蒸汽有较好的吸附能力,但对水溶液中亚甲基兰的吸附量很低,研究了一些改善的工艺,发现采用不气气二次活化处理磷酸活化ACF的方法,可获得率较高,比表面积较大,对有机蒸汽的吸附量高,而且对亚甲基兰的吸附量显著提高等综合性能良好的ACF。 相似文献
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活性炭纤维对NH3的吸附研究:ⅠPAN—ACF孔径结构对NH3静态吸附的影响 总被引:5,自引:3,他引:2
探讨了在较高氨分压下,活性炭纤维(ACF)对于极性吸附质氨的吸附过程,证明在此过程中,ACF孔径结构的重要性。初步讨论了不同的孔径结构下的不同的吸附行为。 相似文献
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Static Adsorption of Xenon on ACF at 257K 总被引:1,自引:0,他引:1
Haitao ZHANG Yalong WANG Xuhui WANG Lixing ZHANG Liyun CHENNorthwest Institute of Nuclear Technology Xi''''an China 《材料科学技术学报》2002,18(6):522-526
The static adsorption of xenon on active carbon fiber(ACF) at 257K was measured with ASAP2010 specific surface area and pore diameter distribution instrument by changing the working gas from nitrogen to xenon.Compared with grain activated carbon(GAC),the results were as follows(1)The adsorption performance of Viscose-based ACF(VACF-As)was the best among all absorbents tested.VACF-A3 was the superior xenon absorbent.The performance of pitch-based ACF(PACF-Cs)approached that of GAC,(2) Due to the difference of aperture distribution ,the adsorption performances of ACF with different radices were different under the same experiment conditions even though the specific surface area was similar,(3)There were some differences of adsorptive capacity among ACF absorbents which had the same radic,however there was not definite relationship between their specific surface area and adsorptive capacity,(4)The adsorption of xenon on all kinds of ACF agrees with Langmuir equation.(5)The adsorptiov curves can be fitted with a binomial equation. 相似文献
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改性PAN—ACFs对甲醛吸附性能的初步研究 总被引:18,自引:3,他引:15
聚丙烯腈(PAN-polyacrylonitrile)活性炭纤维(ACF-Activated carbon fiber)经浸渍处理后,通过低温氮气吸附法测定了其吸附等温线,并通过BET方法计算了比表面积SBET,用Dubinin-Astakhjov方程计算了微孔表面积Smic和微孔容积Vmic,用Horvath-Kawazoe方程计算了微孔容积Vmic和平均孔径D,发现处理后样品的比表面积、微孔容积均小于未经处理的原样,而其对甲醛的静态与动态吸附容量都大于未经过处理的原样品,比表面积太小的样品均小于未经处理的原样,而其对甲醛的静态与动态吸附容量都大于未经过处理的原样品,比表面积太小的样品对甲醛的吸附容量小于较高比表面积的样品的吸附容量,部分被吸附物于150℃不能够完全脱除,经推知,所发生的吸附既有物理吸附又有化学吸附,是其表面官能团与孔结构共同作用的结果,样品的无素分析结果表明,处理后样品的C、N含量均增加,O含量降低,吸附过程中含N官能团的作用较显著,浸渍后的样品经热处理,其吸附容量高于未经热处理的样品,说明热处理可以脱除样品表面的杂原而在PAN-ACFs表面留下许多活性位。 相似文献
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高温热处理对活性炭纤维微孔及表面性能的影响 总被引:14,自引:6,他引:14
研究了1173K高温改性处理对沥青基活性炭纤维吸附性能、孔径分布、微孔结构和表面化学的影响。低温(77K)N2吸附结果表明热处理后活性炭纤维比表面积略有下降,通过密度函数理论解析活性炭纤维全孔范围的孔分布得出活性炭纤维表面孔径大于1.0nm的微孔明显减少,微孔孔径更加集中于0.5nm~1.0nm,从而提高了活性炭纤维的碘吸附值。X射线衍射分析表明活性炭纤维是乱层石墨结构,热处理使活性炭纤维类石墨微晶碳层面的层间距下降,X光电子能谱分析表明热处理后活性炭纤维表面的含氧官能团C=O和COOH的含量变化不大,而呈碱性酚羟基C—OH含量的明显下降使活性炭纤维表面碱性降低。 相似文献
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以沥青基炭纤维为原料,用水蒸气活化的方法制备了三种不同比表面积的活性炭纤维,并采用氮吸附法和拉曼光谱对活性炭纤维进行了表征。本文研究了活性炭纤维在常温下对模拟空气中50 ppm NO的催化氧化性能,结果表明,活性炭纤维可将NO部分催化转化为NO2,较低比表面积的活性炭纤维因为其较窄的孔径分布和较大的类石墨微晶有利于对NO的催化氧化。 相似文献
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Yaping Chen Liang Peng Qingru Zeng Yang Yang Ming Lei Huijuan Song Liyuan Chai Jidong Gu 《Clean Technologies and Environmental Policy》2015,17(1):49-57
The Manganese oxide/active carbon fiber (MO/ACF) was prepared and its electrosorptive properties of Cd(II) in aqueous solution were investigated. The structure of MO/ACF was characterized with transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. Furthermore, the Cd(II) electrosorptive properties of MO/ACF electrodes with different bias potentials, ionic strengths, and loaded amount of manganese oxides were measured and the electrosorption isotherm and kinetics were investigated. The Cd(II) electrosorptive capacity of MO/ACF was 6 times higher than that of pure ACF. The optimal adsorptive bias voltage was 1.5 V and the optimal electrolyte concentration of NaCl was 0.1 mol/L. The adsorption isotherm was agreed well with the Freundlich adsorption model and its maximum electrosorption capacity was 14.88 mg/g by Langmuir model. The higher adsorptive capacity of MO/ACF than that of pure ACF is attributed to higher capacitance and more adsorptive sites of MO/ACF. 相似文献
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In this paper, several kinds of silver supporting activated carbon fibers (ACF-Ag) were prepared by the reduction adsorption
on activated carbon fiber (ACF) activated with steam or H3PO4 using sisal, viscose and pitch fiber as precursors. Their pore structure and surface chemistry were characterized using nitrogen
adsorption, XPS, WXRD and ICP quantitative analysis. Their antibacterial activities were tested. The results showed that metallic
silver particle in micron or nano-scale size could be easily and dispersedly supported onto the surface of ACF using reduction
property of ACF without largely decreasing their specific surface area. The ACF-Ag showed strong antibacterial activity against
Escherichia coli and Staphylococcus aureus. The antibacterial activity has closed relationship with the precursors, the method of activation, silver content and the
specific surface area of the ACFs. Generally, higher silver content and higher specific surface area provide the materials
stronger antibacterial activity. ACF activated with phosphoric acid, due to the presence of certain amount of organic phosphoric
groups on the surface, showed stronger antibacterial activity than those activated with steam. The antibacterial materials
can be easily regenerated without decreasing their antibacterial activity and without releasing large amount of silver from
the solid phase. 相似文献