微型多孔材料
碳化
水合物
化学工程
吸附
多孔性
比表面积
化学
过氧化氢
扫描电子显微镜
无机化学
氧化剂
材料科学
碳纤维
有机化学
催化作用
复合材料
工程类
复合数
作者
Ljiljana Kljajević,Vladislava M. Jovanović,Sanja Stevanović,Ž. Bogdanov,Branka Kaludjerović
标识
DOI:10.2298/jsc100226112k
摘要
Active carbon hollow fibers were prepared from regenerated polysulfone hollow fibers by chemical activation using: disodium hydrogen phosphate 2-hydrate, disodium tetraborate 10-hydrate, hydrogen peroxide, and diammonium hydrogen phosphate. After chemical activation fibers were carbonized in an inert atmosphere. The specific surface area and porosity of obtained carbons were studied by nitrogen adsorption-desorption isotherms at 77 K, while the structures were examined with scanning electron microscopy and X-ray diffraction. The activation process increases these adsorption properties of fibers being more pronounced for active carbon fibers obtained with disodium tetraborate 10-hydrate and hydrogen peroxide as activator. The obtained active hollow carbons are microporous with different pore size distribution. Chemical activation with phosphates produces active carbon material with small surface area with but with both mesopores and micropores. X-ray diffraction shows that besides turbostratic structure typical for carbon materials, there are some peaks which indicate some intermediate reaction products when sodium salts were used as activating agent. Based on data from the electrochemical measurements the activity and porosity of the active fibers depend strongly on the oxidizing agent applied.
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