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알칼리 용제를 이용하여 제조한 셀룰로오스 겔의 카드뮴 흡착특성
황교정(Kyo-Jung Hwang),권구중(Gu-Joong Kwon),양지욱(Ji-Wook Yang),황원중(Won-Jung Hwang),황재현(Jae-Hyun Hwang),김대영(Dae-Young Kim) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.6
This study was carried out to investigate the characterization of cadmium adsorption by cellulose hydrogel and aerogel. Hydrogel and aerogel were made from ashless pulp dissolved in alkali hydroxide-urea aqueous solution and manufactured in film and bead types. After regeneration of cellulose, hydrogel went through the process of substitution of organic solvent and freeze-dry in order to make aerogel. SEM was used to analyze the microstructure of hydrogel and aerogel. Experiment was conducted in various concentrations and pH conditions to find out the characteristic of cadmium adsorption. After that, EDS was used to identify existence and distribution of cadmium in hydrogel and aerogel. The result from comparisons of cadmium adsorption shows that bead type aerogel has the maximum cadmium adsorption and film type hydrogel has the minimum cadmium adsorption.
거대억새 탈리그닌 처리에 있어서 무기물이 리그닌 분석에 미치는 영향
권구중(Gu-Joong Kwon),황교정(Kyo-Jung Hwang),양지욱(Ji-Wook Yang),황재현(Jae-Hyun Hwang),김대영(Dae-Young Kim) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.4
This study was carried out to the influence of inorganic compounds on the analysis of lignin when it comes to delignification by using Miscanthus sinensis which planted on the reclaimed land. Peracetic acid was conducted by using acetic acid and hydrogen peroxide for delignification. For washing raw material before any chemical treatment, we compared a general washing method with a washing method using the screen. In the case of the non-washing sample, there was no clear distinction between the content of the component parts. However, it showed that a quantity of inorganic compound in M. sinensis is affecting by analyzing the content of lignin and inorganic compound with various conditions. So it is considered to be effective to treat M. sinensis with delignification and distilled water with screen washing to get the pure cellulose and use it as bio-materials.
LiBr 수용액으로 용해시켜 제조한 거대억새 홀로셀룰로오스 용해 및 재생 필름특성
양지욱(Ji-Wook Yang),권구중(Gu-Joong Kwon),황교정(Kyo-Jung Hwang),황원중(Won-Jung Hwang),황재현(Jae-Hyun Hwang),김대영(Dae-Young Kim) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.6
In this study, dissolution characteristics of 60% LiBr aqueous solution for Miscanthus sinensis holocellulose in accordance with heating time and characteristics of regenerated films were analyzed. Miscanthus sinensis holocellulose was made by peracetic acid method. During the dissolution of 60% LiBr solution for the holocellulose, the dissolution was started from the tip of the cellulose fiber after about 7 minutes, and proceeded as it swollen like a balloon. A lot of Si was identified by analyzing hollocellulose regenerated film through SEM/EDS. Cross section of regenerated film as dissolution time till 40 minutes of dissolution showed multilayered structure and fiber orientation. But after 40 minutes, multilayered structure and fiber orientation was not observed. The crystal structure of the holecellulose was transformed cellulose I into cellulose II. Therefore, dissolution for 20 minutes with 60% LiBr solution in the condition of 190℃ hot plate was shown as an optimum condition to manufacture the holocellulose regenerated film.
LiOH/Urea 수용액을 이용하여 제조한 재생 셀룰로오스 겔의 공극분포 및 중금속 흡착 특성
권구중(Gu-Joong Kwon),양지욱(Ji-Wook Yang),황교정(Kyo-Jung Hwang),황재현(Jae-Hyun Hwang),황원중(Won-Jung Hwang),김대영(Dae-Young Kim) 한국펄프·종이공학회 2016 펄프.종이기술 Vol.48 No.4
This experiment was carried out to study the pore distribution of regenerated cellulose gel (RCG) prepared by using a LiOH/urea solution and the adsorption characteristics of a lead and cadmium. The specific surface area of RCG was higher in the 2% cellulose concentration with a higher number of beads type than the film type. In the case of pore distribution, they were between 50-150 nm of film type RCG. However, large pore, which are more than 150 nm also existed on the beads type RCG. The adsorption characteristics of cadmium and a lead showed the removal efficiency of the beads type RCG was superior to the film type RCG. The heavy metal removal, based on a pH value of 5-6, showed slightly higher efficiency. Moreover, the rate of removal of lead appeared highly comparable with that of cadmium. According of the FT-IR spectrum analysis, heavy metal adsorption of RCG appeared to be due to the absorption of heavy metals by the hydroxyl group within the cellulose.