| Project/Area Number |
12650761
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
反応・分離工学
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| Research Institution | Ishinomaki Senshu University |
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Principal Investigator |
YAMAZAKI Tatsuya Ishinomaki Senshu Univ., Faculty of Science and Engineering, Professor, 理工学部, 教授 (60174653)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2001: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2000: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Surface Control / Activated carbon / Infrared spectra / Adsorption / Physical adsorption / Lewis acid / 一酸化炭素 / ベンゼン / ピリジン / 表面官能基 / Lewis酸点 / 表面修飾 |
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| Research Abstract |
The purpose in the present work is to clarify the surface characteristics of modefied activated carbons using physisorbed species as probe molecule and to construct methodology of effective surface modification for activated carbons on the basis of the analyses.
Carbon monoxide and two monocyclic aromatic molecules adsorbed on activated carbons were selected as probe molecule, and the IR spectra were analyzed. The IR band of adsorbed CO at 123K can be deconvoluted into two peaks (2137cm^<-1> and 2155cm^<-1>), and they are assigned to adspecies on graphite sheets and on surface polar sites, respectively. The source of electric field was suggested to be surface oxide groups from IR and XPS analyses. IR spectra of benzene adsorbed at room temperature also revealed that the adsorption site for benzene is graphite sheet at low coverage, but polar site also interacts at high coverage with benzene molecule, electrically. Surface oxide groups (anhydride acids and lactones) were introduced onto the activated carbon surface by oxidation treatment, and the sites act as adsorption site for CO (or benzene) with weak interaction. The amount of sites can be discussed using the analyses in this study.
IR spectra of pyridine adsorbed on the activated carbons at room temperature showed the presence of small amount of weak Lewis acidic sites on the surfaces. The surface acid sites were increased by H_2O_2 treatment. On the other hand, a surface -NO_2 group was introduced by HNO_3 treatment. A part of functional groups was exposed on the activated carbon surface, and acts as effective adsorption site.
The analyses developed in the study make possible to discuss real adsorption sites on the activated carbons selectively. It is found that the analyses are useful to optimize treatment conditions of the carbon surfaces.
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