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The effect of fluorine functional groups on carbonization of cellulose fibers
김민일,김도영,김민지,임지선,이영석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Fluorine functional groups in cellulose fibers were introduced by fluorination for increasing of carbonization yield. The surface functional groups and thermal properties of fluorinated cellulose fibers were analyzed by X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA), respectively. Carbonization of fluorinated cellulose fibers was accomplished in N<sub>2</sub> gas at 800 °C for 1h, and the carbonization yield was measured. The content of fluorine functional groups in fluorinated cellulose fibers was increased according to increasing of fluorination temperature. However in high fluorination temperature (at 180 °C), the content of fluorine functional groups was decreased by the high heat energy during fluorination. Introduced fluorine functional groups increases the carbonization yield of cellulose fibers by increasing of double bond (C=C bond). The carbonization yield was increased 52.5% compared to pure cellulose fibers by fluorination at 120 °C.
Effect of electron beam irradiation on carbonization yield of lyocell fibers
김민일,정진영,이다영,이영석 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
The lyocell fibers were treated by electron beam (E-beam) irradiation to improve carbonization yield. The properties of E-beam irradiated lyocell fibers were analyzed by SEM, FT-IR, XPS and TGA. The E-beam irradiated lyocell fibers were carbonized at 800°C during 1 h and the carbonization yield was measured. The lyocell fibers were decomposed at the same time and cross-linked by E-beam irradiation. The decomposition and crosslinking degree of lyocell fibers was increased as increasing E-beam absorbed dose. Therefore, initial decomposition temperature of lyocell fibers was decreased and the carbonization yield was increased as increasing E-beam absorbed dose. The carbonization yield of lyocell fibers by 1500 kGy E-beam irradiation were increased by 25.6% than that of pure lyocell fibers.
Preparation of pitch-based activated carbon with surface-treated fly ash for SO2 gas removal
김민일,임지선,서상완,조정훈,이영석,김상진 한국탄소학회 2020 Carbon Letters Vol.30 No.4
Fly ash consists of various metal oxides which can remove SO2 gas by the catalyst efect. When fy ash is added in the prepa�ration process of pitch-based activated carbon, the pitch particles aggregate and fy ash is embedded in the activated carbon. To increase SO2 gas removal performance, activated carbon was prepared by surface-treated fy ash and petroleum-based pitch. Carboxyl groups were introduced into the fy ash by malic acid treatment. The introduced carboxyl groups acted as an activation agent to create micropore around the fy ash, and created micropores were exposed to the fy ash outside of the activated carbon. The exposed fy ash increased removal amount of SO2 gas by a catalytic efect of the metal oxides. The SO2 gas removal performance improved by 34% because of the catalyst efect of the exposed fy ash and improvement in the micropore structure in the activated carbon.