Abstract
A natural Kutch bentonite was modified using hexadecyl trimethyl ammonium (HDTMA) bromide and dioctadecyl dimethyl ammonium (DODMA) chloride to obtain two different types of organo bentonites viz., HDTMA-bentonite and DODMA-bentonite to study their sorption capacities for sorption of organic contaminants. The natural bentonite and the modified clays were characterized by X-ray diffraction, Fourier transform spectroscopy, thermal analysis, and BET-surface area techniques. The studies revealed that the organic cations in both the modified bentonites are intercalated and assumed pseudo tri layer configuration. The differential scanning calorimetry studies have established that the modified clays are thermally stable up to about 200 °C. The adsorption capacity, in terms of total organic carbon (TOC), increases with increase in the concentration of the organic contaminant up to 500 mg/l for both the modified clays. However the maximum sorption capacity for DODMA-bentonite was found to be higher and reached a maximum value of about 9.0 mg/g whereas and it was 7.8 mg/g for HDTMA-bentonite. The TOC sorption capacity of unmodified bentonite was far less and was about 1 mg/g. Even though the TOC sorption efficiencies were similar for both the organo bentonites, they were not in direct proportion to the amount of organic carbon attached to the clay.
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References
Acar YB, Hamidon A, Field SD, Scott L (1985) The effect of organic fluids on hydraulic conductivity of compacted kaolinite. Hydraulic barriers in soil and rock. Am Soc Test Mater Spec Tech Publ STP 874:171–187
Boldt-Leppin BEJ, Haug MD, Headley JV (1996) Use of organo clay in sand bentonite as a barrier to diesel fuel, Canadian. Geotech J 33:705–719
Bowders JJ, Daniel DE (1987) Hydraulic conductivity of compacted clay to dilute organic chemicals. J Geotech Eng ASCE 113(12):1432–1449
Boyd SA, Mortland MM, Chiou CT (1988) Sorption characteristics of organic compounds on hexadecyltrimethylamonium—smectites. J Soil Soc Am 52:652–657
Fernandez F, Quigley RM (1985) Hydraulic conductivity of natural clays permeated with simple liquid hydrocarbons. Can Geotech J 22:205–214
Fernandez F, Quigley RM (1988) Viscosity and dielectric constant controls on the hydraulic conductivity of clayey soils permeated with water-soluble organics. Can Geotech J 25:582–589
Foreman DE, Daniel DE (1986) Permeation of compacted clay with organic chemicals. J Geotech Eng ASCE 112(7):669–681
Gates WP, Nefiodovas A, Paul P (2004) Permeability of an organo-modified bentonite to ethanol-water solutions. Clays Clay Miner 52(2):192–203
He H, Zhou Q, Martens W, Kloprogge TJ, Yuan P, Xi Y, Zhu J, Frost RL (2006) Microstructure of HDTMA+-modified montmorillonite and its influence on sorption characteristics. Clays Clay Miner 63(6):689–696
Jaynes WF, Boyd SA (1990) Trimethyl phenyl ammonium smectite as effective adsorbents for water soluble aromatic hydrocarbons. J Air Waste Manag Assoc 40(3):1649–1653
Jordan JW (1949) Organophilic bentonites I swelling in organic liquids. J Phys Colloid Chem 53:294–306
Lagaly G (1984) Characterization of clays by organic compounds. Clay Miner 16:1–21
Lee S, Oren AH, Benson CH, Dovantizs K (2012) Organoclays as variably permeable reactive barrier media to manage NAPLs in ground water. J Geotech Geoenviron Eng ASCE 138:115–127
Li LY, Denham WT (2000) The hydraulic conductivity and adsorptivity of organoclay in a sand-bentonite barrier to hydrophobic organic chemicals. Environ Sci Technol 21:1429–1443
Lo IMC, Mak RKM, Lee SCH (1997) Modified clays for waste containment and pollutant attenuation. J Environ Eng ASCE 123(1):25–32
Lo IMC (2001) Organoclay with soil-bentonite admixture as waste containment barriers. J Environ Eng ASCE 127(8):756–759
Lo IMC, Lee CH, Liljetrand HM (1996) Tricaprylmethyl ammonium bentonite complexes as adsorbent for benzene toluene ethyl benzene and xylene. Water Sci Technol 33(8):319–325
Mitchell JK, Madsen FT (1987) Chemical effects on clay hydraulic conductivity. Geotechnical Practices for Waste Disposal ASCE, New York, pp 87–107
Rakhshandehroo GR, Wallace RB, Boyd SA, Voice TC (1998) Hydraulic characteristics of organo modified soils for use in sorptive zone applications. J Soil Sci Soc Am 62:5–12
Soule NM, Burns SE (2001) Effects of organic cation structure on behavior of organo bentonites. J Geotech Geoenviron Eng ASCE 127:363–370
Theng BKG (1974) The chemistry of clay–organic reactions. Adam Hilger, London
Uppot OJ, Stephenson WR (1989) Permeability of clays under organic permenents. J Geotech Eng ASCE 115:115–131
Xie W, Gao Z, Liu K, Pan WP, Vaia R, Hunter D, Singh A (2001) Thermal characterization of organically modified montmorillonite. Thermochim Acta 367–368:339–350
Zhao Q, Burns SE (2012) Molecular dynamics simulation of secondary sorption behavior of montmorillonite modified by single chain quaternary ammonium cations. Environ Sci Technol ACS 46:3999–4007
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Sreedharan, V., Sivapullaiah, P.V. Effect of Organic Modification on Adsorption Behaviour of Bentonite. Indian Geotech J 42, 161–168 (2012). https://doi.org/10.1007/s40098-012-0014-6
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DOI: https://doi.org/10.1007/s40098-012-0014-6