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The adsorption of iodide on untreated bentonite and bentonites modified with organic cation (i.e., hexadecylpyridinium chloride monohydrate (HDP+)) was investigated, and the organobentonites were characterized using uptake measurements, ?XRD, and electrophoretic mobilities measurement. Uptake measurements indicate that bentonite has a high affinity for HDP+. Our ?XRD study indicates that organobentonites significantly expanded in basal spacing and organic cations were substantially intercalated into the interlayer spaces of bentonite. The electrophoretic mobility indicates that organobentonite tht is modified with organic cations in excess of the CEC of bentonite is completely different from untreated bentonite in the surface charge distribution. We found significant differences in adsorption capacities of iodide depending on the bentonite properties as follows: iodide adsorption capacities were 439 mmol/kg for the bentonite modified with HDP+ at an equivalent amount corresponding to 200% of the CEC of bentonite whereas no adsorption of iodide was observed for the untreated bentonite. The molecular environments of iodine adsorbed on organobentonites were further studied using I K-edge and LIII-edge x-ray absorption spectroscopy (XAS). The X-ray absorption near-edge structure (XANES) of iodine spectra from organobentonites was similar to that of KI reference solution. Linear combination fitting of EXAFS data suggests the fraction of iodine reacted with the organic compound increased with increasing loading of the organic compound on organobentonites. In this study, we observed significant differences in the adsorption environments of iodide depending on the modified property of bentonite and suggest that an organobentonite has potential as reactive barrier material around a nuclear waste repository containing anionic radioactive iodide.

유기양이온(hexadecylpyridinium chloride monohydrate (HDP+))으로 개질시킨 유기벤토나이트의 특성을 유기탄소함량 측정, 마이크로-X 선회절 분석, 전기영동 이동성 측정을 이용하여 관찰하고, 무처리 벤토나이트와 유기벤토나이트의 요오드에 대한 흡착성을 비교 조사하였다. 벤토나이트는 유기양이온인 HDP+에 대해서 높은 친화력을 보여주었다. 마이크로-X선 회절 분석 결과에 의하면 유기벤토나이트는 저면 간격에 있어서 현저하게 팽창을 하였고, 이는 유기 양이온이 벤토나이트의 층간에 충분히 삽입되었음을 의미한다. 전기영동 이동성 측정에 의하면벤토나이트의 양이온 교환 용량 이상의 유기 양이온으로 치환시킨 유기벤토나이트의 경우 무처리 벤토나이트와 전혀 다른 표면 전하분포를 나타냄을 알 수 있다. 요오드의 흡착능에 있어서, 무처리 벤토나이트는 요오드를 전혀 흡착하지 못한 반면, 벤토나이트의 양이온 교환용량의 200% 양으로 개질 시킨 유기벤토나이트의 경우 요오드 439 mmol/kg를 흡착하였다. 유기 벤토나이트에 흡착된 요오드의 분자 환경은 요오드 K-edge와 LIII-edge X-선 흡수 분광을 이용하여 연구하였다. 유기벤토나이트의 요오드 X선 흡수 변연 구조를 통해 유기벤토나이트에 흡착된 요오드의 경우 KI 표준용액의 구조와 유사함을 알 수 있었다. 광범위 X-선 흡수 미세구조의 선형 결합 분석결과는 유기 복합체와 반응한 요오드의 비율이 벤토나이트에 흡착된 유기 복합체의 양이 증가함에 따라 같이 증가함을 나타냈다. 본 연구를 통해, 벤토나이트의 개질 특성에 의해 요오드의 흡착 환경이 현저하게 달라짐을 관찰할 수 있었으며, 음이온성 방사성 요오드를 포함하는 핵폐기물 저장소 주변의 방어벽 물질로 유기벤토나이트의 적용 가능성을 살펴 볼 수 있었다.

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참고문헌 (59건) : 자료제공( 네이버학술정보 )

참고문헌 목록에 대한 테이블로 번호, 참고문헌, 국회도서관 소장유무로 구성되어 있습니다.
번호 참고문헌 국회도서관 소장유무
1 Soil transport and plant uptake of radio-iodine from near-surface groundwater 네이버 미소장
2 Iodide Retention by Metal Sulfide Surfaces:  Cinnabar and Chalcocite 네이버 미소장
3 Bonhoure, I., Scheidegger, A.M., Wieland, E., and Dahn, R. (2002) Iodine species uptake by cement and CSH studied by I K-edge X-ray absorption spectroscopy. Radiochim. Acta, 90, 647-651. 미소장
4 Bors, J., Dultz, S., and Riebe, B. (2000) Organophilic bentonites as adsorbents for radionuclides:I. Adsorption of ionic fission products. Appl. Clay Sci., 16, 1-13. 미소장
5 Iodide, caesium and strontium adsorption by organophilic vermiculite 네이버 미소장
6 Bors, J., Martens, R., and Kuhn, W. (1988) Studies on the role of natural and anthropogenic organic substances in the mobility of radio-iodine in soils. Radiochim. Acta, 44/45, 201-206. 미소장
7 Brown, G.E., Jr., Calas, G., Waychunas, G.A., and Petiau, J. (1988) X-ray absorption spectroscopy and its applications in mineralogy and geochemistry.In: Haqthorne, F.C. (Ed), Spectroscopic methodsin mineralogy and Geochemistry, Mineralogical society of America, Reviews in Mineralogy, Washington DC, 18, 431-512. 미소장
8 Spent Nuclear Fuel 네이버 미소장
9 Buraglio, N., Aldahan, A., Possnert, G., and Vintersved,I. (2001) I-129 from the nuclear reprocessing facilities traced in precipitation and runoff in northern Europe. Environ. Sci. Technol, 35,1579-1586. 미소장
10 Sorptive characteristics of tetraalkylammonium-exchanged smectite clays 네이버 미소장
11 Couture, R.A. and Seitz, M.G. (1983) Sorption of anions of iodine by iron oxides and kaolinite.Nucl. Chem. Waste Manage., 4, 301-306. 미소장
12 Biopolymer-Clay Nanocomposites Based on Chitosan Intercalated in Montmorillonite 네이버 미소장
13 Deng, Y. and Dixon, J.B. (2002) Soil organic matter and organic-mineral interaction. In: Dixon, J.B.and Schulze, D.G., Soil Mineralogy with Environmental Applications, Madison, Wisconsin,69-107. 미소장
14 Dultz, S., Riebe, B., and Bunnenberg, C. (2005) Temperature effects on iodine adsorption on organo-clay minerals: II. Structural effects. Appl.Clay Sci., 28, 17-30. 미소장
15 Geochemistry of iodine in relation to iodine deficiency diseases 네이버 미소장
16 Sorption of iodine on minerals investigated by X-ray absorption near edge structure (XANES) and 125I tracer sorption experiments 네이버 미소장
17 Gecol, H., Ergican, E., and Miakatsindila, P. (2005)Biosorbent for tungsten species removal from water: Effects of co-occurring inorganic species. J. Colloid Interface Sci., 292, 344-353. 미소장
18 Gradev, G.D. (1987) Sorption of iodide ions on cationic forms of clinoptilolite. J. Radioanal. Nucl.Chem., 116, 341-346. 미소장
19 Sorption of iodide on copper 네이버 미소장
20 Iodine-129 and Caesium-137 in Chernobyl contaminated soil and their chemical fractionation 네이버 미소장
21 Sorption and transport of iodine species in sediments from the Savannah River and Hanford Sites 네이버 미소장
22 Huie, Z., Zishu, Z., and Lanying, Z. (1988) Sorption of radionuclides technetium and iodine on minerals.Radiochim. Acta, 44/45, 143-145. 미소장
23 Ikeda, Y., Sazarashi, M., Tsuji, M., and Seki, R.(1994) Adsorption of I- ions on cinnabar for 129I waste management. Radiochim. Acta, 65, 195-198. 미소장
24 Johnston, C.T. (1996) Sorption of organic compounds on clay minerals: A surface functional group approach. In: B.L. Sawhney, (ed.), Organic Pollutants in the Environments, CMS Workshop Lectures, 8, The Clay Mineral Society, Boulder, Colorado, 1-44. 미소장
25 Comparison of sorption behavior of I- and TcO4- on Mg/Al layered double hydroxide 네이버 미소장
26 Iodide Sorption to Subsurface Sediments and Illitic Minerals 네이버 미소장
27 Speciation of iodine in solid environmental samples by iodine K-edge XANES: Application to soils and ferromanganese oxides 네이버 미소장
28 Koh, S.M. and Dixon, J.B. (2001) Preparation and application of organo-minerals as sorbents of phenol, benzene and toluene. Appl. Clay Sci., 18,111-122. 미소장
29 Krishna, B.S., Murty, D.S.R., and Jai Prakash, B.S.(2001) Surfactant-modified clay as adsorbent for chromate. Appl. Clay Sci., 20, 65-71. 미소장
30 Characterization of clays by organic compounds 네이버 미소장
31 Sorption of arsenic by surfactant-modified zeolite and kaolinite 네이버 미소장
32 Removal of anionic contaminants using surfactant-modified palygorskite and sepiolite 네이버 미소장
33 Maryuk, O., Pikus, S., Olszewska, E., Majdan, M.,Skrzypek, H., and Zieba, E. (2005) Benzyldimethyloctadecylammonium bentonite in chromates adsorption. Mater. Letters, 59, 2015-2017. 미소장
34 Mortland, M.M. (1986) Mechanisms of adsorption of non-humic organic species by clay. In: Huang,P.M. and Schnitzer, M. Interactions of Soil Minerals with Natural Organics and Microbes,Soil Science Society of America, Madison, Wisconsin.59-76. 미소장
35 Mortland, M.M., Shaobai, S., and Boyd, S.A. (1986)Clay-organic complexes as adsorbents for phenol and chlorophenols. Clays Clay Miner., 34, 581-585. 미소장
36 Özcan, A.S., Erdem, B., and Özcan, A. (2004) Adsorption of Acid Blue 193 from aqueous solutions onto Na-bentonite and DTMA-bentonite.J. Colloid Interface Sci., 280, 44-54. 미소장
37 Adsorption of Nitrate Ions onto Sepiolite and Surfactant-modified Sepiolite 네이버 미소장
38 Paradies, H.H. and Habben, F. (1993) Structure of N-hexadecylpyridinium chloride monohydrate. Acta Cryst., C49, 744-747. 미소장
39 Transformation of Iodide in Natural and Wastewater Systems by Fixation on Humic Substances 네이버 미소장
40 XANES fingerprinting of iodine species in solution and speciation of iodine in spent solvent from nuclear fuel reprocessing 네이버 미소장
41 Influence of temperature pre-treatment and high-molar saline solutions on the adsorption capacity of organo-clay minerals 네이버 미소장
42 Riebe, B., Dultz, S., and Bunnenberg, C. (2005) Temperature effects on iodine adsorption on organo-clay minerals I. Influence of pretreatment and adsorption temperature. Appl. Clay Sci., 28, 9-16. 미소장
43 Risher, J., Diamond, G., Swarts, S.G., and Amata, R.(2004) Toxicological profile for Iodine. Agency for Toxic Substances and Disease Registry(ATSDR), US Department of Health and Human Services, Washington DC, 1-9. 미소장
44 Schlegel, M.L., Reiller, P., Mercier-Bion, F., Barre,N., and Moulin, V. (2006) Molecular environment of iodine in naturally iodinated humic substances:Insight from X-ray absorption spectroscopy. Geochim.Cosmochim. Acta, 70, 5536-5551. 미소장
45 Removal of phenol from water by adsorption–flocculation using organobentonite 네이버 미소장
46 Cosorption of organic contaminants from water by hexadecyltrimethylammonium-exchanged clays 네이버 미소장
47 Chemical behaviour of iodine in organic and mineral soils 네이버 미소장
48 Superiority of K-edge XANES over LIII-edge XANES in the speciation of iodine in natural soils. 네이버 미소장
49 Benzene Transport through Landfill Liners Containing Organophilic Bentonite 네이버 미소장
50 Stipanicev, V. and Branica, M. (1996) Iodine speciation in the water column of the Rogoznica Lake(Eastern Adriatic Coast). Sci. Total Environ., 182,1-9. 미소장
51 Strickert, R., Friedman, A.M., and Fried, S. (1978) Sorption of technetium and iodine radioisotopes by various minerals. Trans. Am. Nucl. Soc, 28, ANS annual meeting, San Diego, CA, USA, 365-366. 미소장
52 Stumm, W. and Morgan, J.J. (1996) Aquatic Chemis-try: Chemical Equilibria and Rates in Natural Waters. John Wiley & Sons, New York, 1022p. 미소장
53 Theng, B.K.G. (1974) The chemistry of clay-organic reactions. Wiley, New York. 343p. 미소장
54 Adsorption of inorganic anionic contaminants on surfactant modified minerals 네이버 미소장
55 Cationic Surfactant Adsorption by Swelling and Nonswelling Layer Silicates 네이버 미소장
56 Cationic Surfactant Sorption to a Vermiculitic Subsoil via Hydrophobic Bonding. 네이버 미소장
57 Yamada, H., Kiriyama, T., Onagawa, Y., Hisamori, I.,Miyazaki, C., and Yonebayashi,K.(1999)Speciation of iodine in soils. Soil Sci. Plant Nutr., 45, 563-568. 미소장
58 Redox reaction of iodine in paddy soil investigated by field observation and the I K-Edge XANES fingerprinting method. 네이버 미소장
59 Zhu, L. and Zhu, R. (2007) Simultaneous sorption of organic compounds and phosphate to inorganic-organic bentonites from water. Separ. Purif. Tech- nol., 54, 71-76. 미소장