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백기현,김동호,윤승락 ( Ki Hyon Paik,Dong Ho Kim,Seung Lak Yoon ) 한국환경농학회 1996 한국환경농학회지 Vol.15 No.3
The pretreatment of bark powder with sodium hydroxide and formalin showed the most excellent adsorption ratio, but this method could not practically be used because of the occurrence of dark-colored pigments in filtrates during pretreatment. Instead, acid and formalin were the most affirmative and effective among the pretreatment methods tested, and could be used for this purpose. Among tested species, Quercus acutissima and Robinia pseudo-accacia showed the largest amount of metal adsorption, and Pb^(2+) was the best(83 to 96%) among the four heavy metals tested. The order of adsorption ratios other metals was as follows; Cu^(2+) $gt; Zn^(2+) $gt; Cd^(2+), and the ratio was approximately 45 to 55%. In addition, as the substrate amount increased, the amount of adsorbed heavy metals in subtrates gradually increased, but the adsorbed amount was not proportional to the substrate amount. The order of heavy metal adsorption was as follows; Pb^(2+) $gt; Cu^(2+) $gt; Cd^(2+) $gt; Zn^(2+). Depending on flow rate and column size, pine bark power adsorbed more heavy metals in the 5㎖/min flow rate and 3.5㎝ column size rather than the 10㎖/min and 2.0㎝. However, oak bark power showed contrary results compared with pine bark powder, The adsorption of Pb^(2+) occurred rapidly in the incipient stagte. Even though bark powders were repeatedly used three times, there was no change in the adsorption ratio(45%), but after four times, the adsorption ratio was significantly reduced to 35%.
수피에 의한 중금속 흡착시 경금속의 영향과 중금속간의 흡착 경쟁
백기현,김동호,최돈하 ( Ki Hyon Paik,Dong Ho Kim,Don Ha Choi ) 한국환경농학회 1997 한국환경농학회지 Vol.16 No.2
When the light metals such as Ca^(++) and Mg^(++) were added to heavy metal solution, the adsorption of heavy metals was increased by 20 to 30% more, but there were no differences between species. Pb^(++) was the most adsorbed metal(99.5%), and the adsorption ratio of Cd^(++) was significantly improved. In addition, when the light metal concentration was increased to 100ppm, the adsoption ratios of all four heavy metals were reached to 92 to 99%, while coniferous barks showed only 85 to 92%. On the mixture of four heavy metals, the adsorbed amount of each metal was significantly reduced, compared with that of one heavy metal, while Zn^(++) showed the adsorption improvement to 95%. On the column experiment, Pb^(++) was almost completely adsorbed in the upper part of column, and the adsorbed amount of Cu^(++) was gradually decreased depending on column depth. However, Cd^(++) and Zn^(++) were not influenced by column height, and constantly adsorbed on various column height. Based on the above results, each heavy metal had different adsorption mechanism.
여러 가지 보류시스템에서 탄산칼슘의 보류와 종이의 기계적 , 광학적 특성의 비교
백기현,안병준,손상돈 ( Ki Hyon Paik,Byoung Jun Ahn,Sang Don Shon ) 한국공업화학회 1996 공업화학 Vol.7 No.2
본 실험에서는 보류향상제의 첨가량과 중질 탄산칼슘 첨가량에 따른 탄산칼슘 보류량(회분함량)을 조사하였으며, 동일 회분량에서 종이의 기계적·광학적 특성을 비교하였다. 각 보류시스템 모두 보류향상제 첨가량을 증가시키면 중질 탄산칼슘(입자평균직경 3.2㎛) 보류, 즉 종이의 회분량은 증가한다. 이 경우 보류향상제와 중질 탄산칼슘 첨가량을 조절하여 이미 예정된 회분량이 함유된 종이를 초지할 수 있다. 종이의 인장지수, 파열지수, 인열지수 및 내부결합강도는 종이의 회분량이 증가됨에 따라 직선적으로 감소한다. 특히 동일 회분량에서 비교하면, 콤포질 시스템에 의한 종이에서 제반 강도가 높고, 듀알 폴리머 시스템에서는 강도가 낮다. 불투명도는 회분량 증가에 따라 함께 증가하며, 하이드로콜 시스템에서 가장 높고 역시 듀알 폴리머에서 가장 낮다. 동일 불투명도에서 종이의 강도는 콤포질, 하이드로콜, 듀알 폴리머 시스템 순으로 감소한다. 그러나 보류향상제의 우열을 판단하기 위해서는 충전제의 보류량과 종이의 강도 이외에도 적정 생산조건 및 적정 공정조건과 같은 여러 가지 다른 요인들도 고려되어야 한다. In this paper, we investigated the retention amounts(ash contents) according to the addition amounts of retention aid and calcium carbonate and compared the mechanical and optical properties of sheets under the same ash content. As the addition amounts of retention aid increase, the retention of calcium carbonate, that is, ash contents of sheets increase in all retention system. In this case, the sheets included ash content as already expected is produced by adjusting the addition amounts of retention aid and calcium carbonate. Tensile index, burst index, tear index, internal bonding strength of sheets straightly decrease as the ash content of sheets increases. Especially, in the same ash content, all sorts of strength are high in compozil system, low in dual polymer system. Opacity increases along with according to the increase of ash content, and is high in hydrocol system, the worst in dual polymer system. In equal opacity, the strength of paper decreases compozil, hydrocol, and dual polymer system in order. But to judge the superiority or inferiority of retention aids, it should consider the various factors such as the optimum production and process conditions besides the retention amounts of filler and the sheet strength.
백기현,김동호,윤승락,Paik, Ki-Hyon,Kim, Dong-Ho,Yoon, Seung-Lak 한국환경농학회 1996 한국환경농학회지 Vol.15 No.3
The pretreatment of bark powder with sodium hydroxide and formalin showed the most excellent adsorption ratio, but this method could not practically be used because of the occurrence of dark-colored pigments in filtrates during pretreatment. Instead, acid and formalin were the most affirmative and effective among the pretreatment methods tested, and could be used for this purpose. Among tested species, Quercus acutissima and Robinia pseudo-accacia showed the largest amount of metal adsorption, and $Pb^{2+}$ was the best(83 to 96%) among the four heavy metals tested. The order of adsorption ratios other metals was as follows; $Cu^{2+}$ > $Zn^{2+}$ > $Cd^{2+}$, and the ratio was approximately 45 to 55%. In addition, as the substrate amount increased, the amount of adsorbed heavy metals in subtrates gradually increased, but the adsorbed amount was not proportional to the substrate amount. The order of heavy metal adsorption was as follows; $Pb^{2+}$ > $Cu^{2+}$ > $Cd^{2+}$ > $Zn^{2+}$. Depending on flow rate and column size, pine bark power adsorbed more heavy metals in the 5ml/min flow rate and 3.5cm column size rather than the 10ml/min and 2.0cm. However, oak bark power showed contrary results compared with pine bark powder. The adsorption of $Pb^{2+}$ occurred rapidly in the incipient stagte. Even though bark powders were repeatedly used three times, there was no change in the adsorption ratio(45%), but after four times, the adsorption ratio was significantly reduced to 35%.