共查询到20条相似文献,搜索用时 52 毫秒
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研究了活性炭纤维的H3PO4活化法,用碘值、苯值测定了活性炭纤维的吸附性能。制备出了比表面积为1578.64m^2/g,孔容为0.55mL/g,平均孔径为0.697nm的优质活性炭纤维。 相似文献
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利用水蒸气活化法、KOH活化法、H3PO4活化法制备聚丙烯腈基活性炭纤维,并对用不同活化方法所制得的活性炭纤维进行吸附性能测试和比较。结果表明,在较佳工艺条件下化学活化法制备的活性炭纤维的吸附性能强于水蒸气活化法制备的活性炭纤维。 相似文献
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熔纺氨纶的制备方法及性能 总被引:5,自引:1,他引:5
简要介绍了熔融纺丝法生产氨纶的优点,着重介绍了国内外氨纶熔融纺丝生产工艺以及熔纺氨纶结构与性能关系方面的研究动态,并对如何改善熔纺氨纶的力学性能提出了几点设想。 相似文献
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采用磷酸活化木质素磺酸钠(Na-Ls)制备活性炭,考查磷酸浓度和活化温度对活性炭碘吸附值及得率的影响,优化制备条件.利用扫描电镜对活性炭进行了形貌表征.结果表明,活性炭制备的最佳条件为:磷酸浓度为34wt%,活化温度800℃.所得活性炭的孔结构呈裂隙状,碘吸附值为1 259.3 mg/g.利用热失重和傅里叶变换红外光谱等方法,研究了磷酸活化木质素的热分解过程和发生的物质变化.结果表明,磷酸在Na-Ls的热分解中涉及交联、催化、氧化反应;磷酸的加入改变Na-Ls热解途径的同时提高了其高温热稳定性;磷酸浓度和活化温度是影响活性炭成孔及吸附性能的重要因素. 相似文献
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粘胶基活性炭纤维结构突出,性能优越,吸附量大,制备得率高,便于加工控制和改性处理,因而其产量最多,应用最广泛.介绍了粘胶基活性炭纤维材料的结构特点,性能多样性、加工制备过程和化学改性的国内外研究状况,并对其应用前景进行了展望. 相似文献
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以磷酸法木质素基活性炭为原料,三聚氰胺为氮源、KOH为活化剂,采用同步掺杂方式制备了氮掺杂活性炭(NAC)。通过BET、XRD、拉曼光谱和XPS表征手段测试了改性后活性炭的结构及其组分,并通过电化学表征手段,测试了其作为超级电容器电极材料在几种不同性质电解液中的性能,初步探究了电解液对电极材料电化学性能的影响机制。实验结果表明:改性后的活性炭具有丰富的孔结构,比表面积达到2 332 m2/g,微孔孔容为1.37 cm3/g,中孔孔容为0.74 cm3/g,平均孔径为2.79 nm,含氮元素7.5%,其中类石墨型氮(N-Q)结构达到34.6%。丰富的孔结构和氮含量大幅提升了活性炭的电化学性能,其在水系电解液中展现出了高比电容,在1 A/g的电流密度下比电容最高可达424 F/g;在有机系电解液中,尽管其在1 A/g的电流密度下比电容最高仅为87 F/g,由于其工作电压窗口更宽(0~2.5 V),因此具备了更高的能量密度。对结果进行分析,发现:活性炭电极材料在水系电解液中的性能主要受电解液水合离子半径影响,而在有机系电解液中... 相似文献
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以碱木质素和杉木屑为原料,磷酸为活化剂,制备碱木质素基成型活性炭,考察了碱木质素质量分数、浸渍比、活化温度、活化时间等对活性炭性能的影响。研究结果表明:碱木质素复配杉木屑(碱木质素质量分数50%)后,复配料的表面润湿性显著提高,瞬时水接触角由133.2°(碱木质素)降低至86.6°(复配料);热膨胀系数显著降低,膨胀温度区间的热膨胀系数由2 365μm/(m·℃)(碱木质素)降低至45μm/(m·℃)(复配料)。在最佳工艺条件即碱木质素质量分数50%、浸渍比1.5∶1(纯磷酸与复配料质量比)、活化温度500℃、活化时间90 min下,制备的成型活性炭得率41.76%,碘吸附值1 070 mg/g,亚甲基蓝吸附值255 mg/g,强度90%,比表面积1 646 m2/g,总孔容积为0.795 cm3/g,其中孔径小于5 nm的孔容积占总孔容积的97.2%。 相似文献
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活性碳纤维 总被引:3,自引:2,他引:1
廷璋 《高科技纤维与应用》1999,(4)
简要介绍了国内外活性碳纤维(ACF)的发展史、主要产品的应用动向,并重点介绍了三家公司的产品发展概况和新工艺技术,最后对ACF今后的发展作了展望. 相似文献
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中孔活性碳纤维及其吸附特性 总被引:10,自引:0,他引:10
活性碳纤维具有丰富的有效吸附孔,孔径分布窄,吸脱行程短,吸脱速度快,吸附容量大。是,一般活性碳纤维的孔径较小,限制了对大分子的吸附,使其应用受到一定限制,近年来,科学工作者进行了中孔型活性炭纤维的研制,以拓宽其应用领域,本文着重阐述了中孔活性碳纤维的制造方法及其吸附特性。 相似文献
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Ju-Hwan Kim Sang-Chul Jung Hye-Min Lee Byung-Joo Kim 《International journal of molecular sciences》2022,23(7)
This study presents the first investigation of cellulose-based activated carbon fibers (RACFs) prepared as electrode materials for the electric double-layer capacitor (EDLC) in lieu of activated carbon, to determine its efficacy as a low-cost, environmentally friendly enhancement alternative to nanocarbon materials. The RACFs were prepared by steam activation and their textural properties were studied by Brunauer–Emmett–Teller and non-localized density functional theory equations with N2/77K adsorption isotherms. The crystallite structure of the RACFs was observed by X-ray diffraction. The RACFs were applied as an electrode material for an EDLC and compared with commercial activated carbon (YP-50F). The electrochemical performance of the EDLC was analyzed using galvanostatic charge/discharge curves, cyclic voltammetry, and electrochemical impedance spectroscopy. The results show that the texture properties of the activated carbon fibers were influenced by the activation time. Crucially, the specific surface area, total pore volume, and mesopore volume ratio of the RACF with a 70-min activation time (RACF-70) were 2150 m2/g, 1.03 cm3/g and 31.1%, respectively. Further, electrochemical performance analysis found that the specific capacitance of RACF-70 increased from 82.6 to 103.6 F/g (at 2 mA/cm2). The overall high specific capacitance and low resistance of the RACFs were probably influenced by the pore structure that developed outstanding impedance properties. The results of this work demonstrate that RACFs have promising application value as performance enhancing EDLC electrode materials. 相似文献
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Chiaki Ishii Takaomi Suzuki Norifumi Shindo Katsumi Kaneko 《Journal of Porous Materials》1997,4(3):181-186
Pitch (PIT) and cellulose (CEL)-based activated carbon fibers (ACFs) were heated at 1473–3173 K under an Ar atmosphere. The N2 adsorption, X-ray diffraction (XRD), and magnetic susceptibility of the heat-treated ACFs were measured. The specific surface area of ACF samples was determined by the subtracting pore effect (SPE) analysis using the N2 adsorption isotherm.Both stacking height, Lc and stacking width, La of ACFs began to increase remarkably above 2000 K. The amounts of N2 adsorption on PIT and CEL became nil by heating above 1773 K and 2073 K, respectively. The relationships between the heating temperature and the magnetic susceptibility of ACFs near room temperature were divided into three regions: below 1773 K, from 1773 K to 2473 K, and above 2473 K.The results from gas adsorption, X-ray diffraction and magnetic susceptibilities have been explained with respect to the changes taking place in these three regions. 相似文献