Yang Cheol-Min, Kaneko Katsumi
Graduate School of Science and Technology, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan.
J Colloid Interface Sci. 2002 Feb 1;246(1):34-9. doi: 10.1006/jcis.2001.8012.
Iodine-doped activated carbon fibers (ACFs) were prepared by the iodine immersion method on pitch-based ACF. Then iodine-doped ACFs were heated in argon at 523 K for 4 h and at 673 K for 2 h. The iodine structure of the resultant iodine-doped ACFs was examined using X-ray photoelectron spectroscopy. The micropore structures were determined by N(2) adsorption at 77 K. The surface area and micropore volume of iodine-doped ACFs are less than those of pristine ACFs. However, the pore width does not change with the iodine doping. The effects of iodine doping on adsorption properties of ACFs for H(2)O and NO at 303 K were examined. The iodine doping affected remarkably the adsorptivities of ACFs for H(2)O and NO. In particular, iodine-doped ACFs treated at 673 K show enhanced adsorptivities for H(2)O and NO. This result suggests that iodine molecules doped on the micropores should be charged by heat treatment at 673 K.
采用碘浸渍法在沥青基活性炭纤维上制备了碘掺杂活性炭纤维。然后将碘掺杂活性炭纤维在氩气中于523 K加热4 h，再于673 K加热2 h。使用X射线光电子能谱对所得碘掺杂活性炭纤维的碘结构进行了检测。通过在77 K下的N₂吸附测定微孔结构。碘掺杂活性炭纤维的表面积和微孔体积小于原始活性炭纤维。然而，孔径不会随碘掺杂而改变。研究了碘掺杂对活性炭纤维在303 K下对H₂O和NO吸附性能的影响。碘掺杂显著影响了活性炭纤维对H₂O和NO的吸附率。特别是，在673 K处理的碘掺杂活性炭纤维对H₂O和NO的吸附率有所提高。该结果表明，掺杂在微孔上的碘分子应通过在673 K下的热处理而带电。
