Colloidal stability of bentonite clay considering surface charge properties as a function of pH and ionic strength

Min Hoon Baik; Seung Yeop Lee

Journal of Industrial and Engineering Chemistry, Vol.16, No.5, 837-841, September, 2010

DOI10.1016/j.jiec.2010.05.002 Export Citation

Colloidal stability of bentonite clay considering surface charge properties as a function of pH and ionic strength

Min Hoon Baik^†, and Seung Yeop Lee

Radioactive Waste Technology Development Division, Korea Atomic Energy Research Institute, Daedeokdaero 1045, Yuseong-Gu, Daejeon 305-353, Republic of Korea

E-mail:

Surface charge properties of bentonite colloids were investigated to study their colloidal stability in a solution as a function of the pH and ionic strength. Potentiometric titrations and zeta potential measurements for the bentonite colloids depending upon the pH and ionic strength were performed to investigate the surface charge properties. It was observed from the potentiometric titrations that a zero net proton adsorption occurred at about pH 8.2 (pHPNZPC ~ 8.2). Surface charges of the bentonite colloids mainly carrying structural negative charges revealed a very small dependency on the pH. The same behavior was also observed in the zeta potential measurements. The zeta potential measurements for the bentonite colloid showed that the bentonite colloids were stable at lower ionic strengths of 0.01 and 0.001 M NaClO4 but unstable at a higher ionic strength of 0.1 M NaClO4 within the whole pH range studied. Therefore, it can be concluded that bentonite colloids would be stable in most of the considered fresh groundwater conditions, i.e., pH from 6 to 10 and an ionic strength from 0.001 to 0.01 M, and then they can be mobilized along a flowing groundwater.

Keywords:Colloidal stability;Bentonite colloids;Surface charge;Zeta potential;Coagulation

[References]

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Kraepiel AML, Keller K, Morel FMM, Environ. Sci. Technol., 32, 2829 (1998)
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Horikawa Y, Murray RS, Quirk JP, Colloids Surf., 32, 181 (1988)
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[2] Kim SS, Baik MH, Kang KC, Kwon SH, Choi JW, J. Ind. Eng. Chem., 14(6), 739 (2008)

[3] Mo¨ ri A, Alexander WR, Geckeis H, Hauser W, Scha¨ fer T, Eikenberg J, Fierz T, Degueldre C, Missana T, Colloids Surf. A., 217, 33 (2003)

[4] Baik MH, Cho WJ, Hahn PS, Eng. Geol., 9, 229 (2007)

[5] Grindrod P, Peletier M, Takase H, Eng. Geol., 54, 159 (1999)

[6] Pusch P, Stability of Bentonite Gels in Crystalline Rock.Physical Aspects, SKBF/KBS Technical Report 83-04, Swedish Nuclear Fuel and Waste Management Co., Stockholm (1983)

[7] Pusch R, Erlstro¨m M, Bo¨ rgesson L, Piping and Erosion Phenomena in Soft Clay Gels, SKB Technical Report 87-09, Swedish Nuclear Fuel and Waste Management Co., Stockholm (1987)

[8] Van Olphen H, An Introduction to Clay Colloid Chemistry, Wiley Interscience, Van Olphen, An Introduction to Clay Colloid Chemistry, Wiley Interscience, (1977)

[9] Johnston CT, Tomba´ cz E, in: Dixon JB, Schulze DG (Eds.), Soil Mineralogy with Environmental Applications, Soil Science Society of America, Madison, 37 (2002)

[10] Tomba´ cz E, Szekeres M, Appl. Clay Sci., 27, 75 (2004)

[11] Lagaly G, Ziesmer S, Adv. Colloid Interf. Sci., 100, 105 (2003)

[12] Shin YC, Lee DK, Lee KT, Ahn KH, Kim BS, J. Ind. Eng. Chem., 14(4), 515 (2008)

[13] Joo HH, Lee HY, Guan YS, Kim JC, J. Ind. Eng. Chem., 14(5), 608 (2008)

[14] Missana T, Adell A, J. Colloid Interface Sci., 230(1), 150 (2000)

[15] Avena MJ, Cabrol R, De Pauli CP, Clays Clay Miner., 38, 356 (1990)

[16] Delgado A, Gonza´ lez-Caballero F, Bruque JM, J. Colloid Interf. Sci., 113, 203 (1986)

[17] Duran JDG, Ramos-Tejada MM, Arroyo FJ, Gonzalez-Caballero F, J. Colloid Interface Sci., 229(1), 107 (2000)

[18] Niriella D, Carnahan RP, J. Disper. Sci. Technol., 27, 123 (2006)

[19] Janek M, Lagaly G, Appl. Clay Sci., 19, 121 (2001)

[20] Luckham PF, Rossi S, Adv. Colloid Interf. Sci., 82, 43 (1999)

[21] Penner D, Lagaly G, Clays Clay Miner., 48, 246 (2000)

[22] Baik MH, Park JH, Cho WJ, J. Kor. Soc. Soil Groundwater Environ., 11, 12 (2006)

[23] Cho WJ, Lee JO, Chun KS, Appl. Clay Sci., 14, 47 (1999)

[24] Baeyens B, Bradbury MH, J. Contam. Hydrol., 27, 199 (1997)

[25] Tournassat C, Greneche JM, Tisserand D, Charlet L, J. Colloid Interface Sci., 273(1), 224 (2004)

[26] Hiemenz PC, Rajagopalan R, Principles of Colloid and Surface Chemistry, Marcel Dekker, New York (1997)

[27] Thompson DW, Butterworth JT, J. Colloid Interf. Sci., 151, 236 (1992)

[28] Tomba´ cz E, A´ braha´m I, Gilde M, Sza´nto F, Colloids Surf., 49, 71 (1990)

[29] Kraepiel AML, Keller K, Morel FMM, Environ. Sci. Technol., 32, 2829 (1998)

[30] Avena MJ, De Pauli CP, J. Colloid Interface Sci., 202(1), 195 (1998)

[31] Horikawa Y, Murray RS, Quirk JP, Colloids Surf., 32, 181 (1988)

[32] Secor RB, Radke CJ, J. Colloid Interf. Sci., 103, 237 (1985)

[33] Lagary G, Appl. Clay Sci., 4, 105 (1989)