검색결과

검색조건
좁혀보기
검색필터
결과 내 재검색

간행물

    분야

      발행연도

      -

        검색결과 13

        1.
        2020.02 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Increasing demand for fossil fuels is associated with massive atmospheric CO2 levels. Considering that numerous studies have been published with CO2 capturing techniques, utilizing techniques are yet in early stage with financial or technical issues. As a part of chemical conversion in CO2 utilization, this paper investigated the performance of a CO2 and H2O mixture (CHM) onto activated carbon fibers (ACF) for surface modification. CHM-treated ACF samples were prepared at a pressure of 20 bar with 100 °C of water vapor and 750 μL of CO2 for 1 h through the gas-phase, and labeled as C-ACF850. For the control sample, N-ACF850 was also prepared by the impregnation of nitric acid. Physiochemical analyses revealed that the overall characteristics of C-ACF850 lay between ACF850 and N-ACF850. C-ACF850 experienced minimized surface area decrement (21.92% better than N-ACF850), but increased surface functional groups (50.47% better than ACF850). C-ACF850 also showed preferable adsorption efficiency on selected metals, in which case both physical and chemical properties of adsorbent affect the overall adsorption efficiency. In this regard, a novel applicability of CHM may present an appealing alternative to traditionally used strong acids.
        4,000원
        2.
        2019.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Fibrous adsorbents, such as activated carbon fibers (ACF) have acknowledged advantages of rapid adsorption rate and ease of modification compared with granular and powdered adsorbents. Based on the surface modification of lyocell-based ACF, we observed different surface characteristics of ACF samples with variation in the mixing ratio and impregnation time of H3PO4, NaCl, and KMnO4 solution. For an engineering application, we also explored the adsorption characteristics of thusproduced ACF samples onto volatile organic compounds (VOCs). Isothermal adsorption experiments were performed using toluene and benzene as adsorbates. Results indicate that both physical and chemical surface properties have an effect on the adsorption of volatile organic compounds (VOCs).
        4,000원
        7.
        2001.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        4,600원
        11.
        1990.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Two perforated plates(a square plate and a rectangular plate having an as야ct ratlO 1.57(L,=11, L,= 7)) are taken as analysis examples. Each of these plates is given some changes in the boundary ∞nditions. The size of cutouts as well as their locations are also changed in order to examine the variation of two eigenvalues corresponding to the fundamental mode. The relationship between two eigenvalues is estab!ished by changing the magnitude of edge thrust
        4,300원