[1] Stephen, G. and Martin, R.T. (1995) Definition of Clay and Clay Minerals: Joint Report of the Aipea Nomenclature and CMS Nomenclature Committees. Clay and Clay Minerals, 43, 255-256.
http://dx.doi.org/10.1346/CCMN.1995.0430213
[2] Grim, R.E. and Güven, N. (1978) Bentonites, Geology, Mineralogy, Properties and Uses, Development in Sedimentology. Vol. 24, Elsevier, Amsterdam.
[3] Murray, H.H. (1991) Some Application of Clay Minerals. Applied Clay Science, 5, 379-395.
http://dx.doi.org/10.1016/0169-1317(91)90014-Z
[4] Pauling, L. (1967) The Nature of the Chemical Bond. Cornell University Press, New York.
[5] Murray, H.H. (2000) Traditional and New Applications for Kaolin, Smectite Andpalygorskite: A General Overview. Applied Clay Science, 17, 207-221. http://dx.doi.org/10.1016/S0169-1317(00)00016-8
[6] Ayari, F., Srasra, E. and Trabelsi-Ayadi, M. (2005) Characterization of Bentonitic Clays and Theiruse as Adsorbent. Desalination, 185, 391-397. http://dx.doi.org/10.1016/j.desal.2005.04.046
[7] Murray, H.H. (1999) Applied Clay Mineralogy Today and Tomorrow. Clay Miner, 34, 39-49.
http://dx.doi.org/10.1180/000985599546055
[8] Christidis, G.E., Scott, P.W. and Dunham, A.C. (1997) Acid Activation and Bleaching Capacity of Bentonitesfrom the Islands of Milos and Chios, Aegean, Greece. Applied Clay Science, 12, 329-347.
http://dx.doi.org/10.1016/S0169-1317(97)00017-3
[9] Joshi, R.C., Achari, G., Horfield, D. and Nagaraj, T.S. (1994) Effect of Heat Treatment on Strength of Clays. Journal of Geotechnical Engineering, 120, 1080-1088, http://dx.doi.org/10.1061/(ASCE)0733-9410(1994)120:6(1080)
[10] Juang, R.-S., Lin, S.-H. and Tsao, K.-H. (2002) Mechanism of the Sorption of Phenols from Aqueous Solutions into Surfactant-Modified Montmorillonite. Journal of Colloid and Interface Science, 254, 234-241. http://dx.doi.org/10.1006/jcis.2002.8629
[11] Noyan, H., Önal, M. and Sarikaya, Y. (2007) The Effect of Sulfuric Acid Activation on Crystallinity, Surface Area, Porosity, Surface Acidity and Bleaching Power of a Bentonite. Food Chemistry, 105, 156-163. http://dx.doi.org/10.1016/j.foodchem.2007.03.060
[12] Hassan, M.S. and Abdel-Khalek, N.A. (1998) Beneficiation and Applications of an Egyptian Bentonite. Applied Clay Science, 13, 99-115. http://dx.doi.org/10.1016/S0169-1317(98)00021-0
[13] Jovanovic, N. and Janackovic, J. (1991) Pore Structure and Adsorption Properties of an Acid Activated Bentonite. Applied Clay Science, 6, 59-68. http://dx.doi.org/10.1016/0169-1317(91)90010-7
[14] Komadel, P., Schmidt, D., Madejova, J. and Cicel, B. (1990) Alteration of Smectites by Treatments with Hydrochloric Acid and Sodium Carbonate Solutions. Applied Clay Science, 5, 113-122.
http://dx.doi.org/10.1016/0169-1317(90)90017-J
[15] Banat, F.A., Al-Bashir, B., Al-Asheh, S. and Hayajneh, O. (2000) Adsorption of Phenol by Bentonite. Environmental Pollution, 107, 391-398. http://dx.doi.org/10.1016/S0269-7491(99)00173-6
[16] Tyagi, B., Chudasama, C.D. and Jasra, R.V. (2006) Determination of Structural Modification in Acid Activated Montmorillonite Clay by FT-IR Spectroscopy. Spectrochimica Acta Part A, 64, 273-278.
[17] Van Olphen, H. and Fripiat, J.J. (1979) Data Handbook for Clay Materials and Other Non-Metallic Minerals. Pergamon Press, Oxford.
[18] Novak, I. and Cicel, B. (1978) Dissolution of Smectites in Hydrochloric Acid: II Dissolution Rate as a Function of Crystallochemical Composition. Clays and Clay Minerals, 26, 341-344.
[19] Önal, M., Sarikaya, Y. and Alemdaroglu, T. (2002) The Effect of Acid Activation on Some Physicochemical Properties of a Bentonite. Turkish Journal of Chemistry, 26, 409-416.
[20] Park, S.J., Seo, D.I. and Lee, J.R. (2002) Surface Modification of Montmorillonite on Surface Acid-Base Characteristics of Clay and Thermal Stability of Epoxy/Clay Nanocomposites. Journal of Colloid and Interface Science, 251, 160-165. http://dx.doi.org/10.1006/jcis.2002.8379
[21] Venaruzzo, J.L., Volzone, C., Rueda, M.L. and Ortiga, J. (2002) Modified Bentonitic Clay Minerals as Adsorbents of CO, CO2 and SO2 Gases. Microporous and Mesoporous Materials, 56, 73-80. http://dx.doi.org/10.1016/S1387-1811(02)00443-2
[22] Carrado, K.A. and Komadel, P. (2009) Bentonites-Versatile Clays: Acid Activation of Bentonites and Polymer-Clay Nanocomposites. Elements, 5, 111-116.
[23] Amari, A., Chlendi, M., Gannouni, A. and Bellagi, A. (2010) Optimised Activation of Bentonite for Toluene Adsorption. Applied Clay Science, 47, 457-461. http://dx.doi.org/10.1016/j.clay.2009.11.035
[24] Diaz, F.C. and Sanctos, P.S. (2001) Studies on the Acid Activation of Brazilian Smectitic Clays. Química Nova, 24, 345-353.
[25] Pesquera, C., Gonzalez, F., Benito, I., Blanco, C., Mendioroz, S. and Pajares, J. (1992) Passivation of a Montmorillonite by the Silica Created in Acid Activation. Journal of Materials Chemistry, 2, 907-912. http://dx.doi.org/10.1039/jm9920200907
[26] Temuujin, J., Jadamobaa, T., Burmaa, G., Erdenechimeg, S., Amarsanaa, J. and Mackenzie, K.J.D. (2004) Characterization of Acid Activated Montmorillonite from Tuulant (Mongolia). Ceramics International, 30, 251-255. http://dx.doi.org/10.1016/S0272-8842(03)00096-8
[27] Önal, M. and Sarikaya, Y. (2007) Preparation and Characterization of Acid-Activated Bentonite Powders. Powder Technology, 172, 14-18. http://dx.doi.org/10.1016/j.powtec.2006.10.034
[28] Kashani Motlagh, M.M., Youzbashi, A.A. and Amiri Rigi, Z. (2011) Effect of Acid Activation on Structural and Bleaching Properties of Bentonite. Iranian Journal of Materials Science and Engineering, 8, 50-56.
[29] Zorica, P.T., Svetlana, B.A., Biljana, M.B., Vesna, A.P., Aleksandar, R.Ð. and Svjetlana, B.C. (2011) Modification of Smectite Structure by Sulphuric Acid and Characteristics of the Modified Smectite. Journal of Agricultural Sciences, 56, 25-35.
[30] Kumar, P., Jasra, R.V. and Bhat, T.S.G. (1995) Evolution of Porosity and Surface Acidity in Montmorillonite Clay on Acid Activation. Industrial & Engineering Chemistry Research, 34, 1440-1448.
http://dx.doi.org/10.1021/ie00043a053
[31] Emmerich, K., Madsen, F.T. and Kahr, G. (1999) Dehydroxylation Behavior of Heat-Treated and Steam-Treated Homoionic CIS-Vacant Montmorillonites. Clays and Clay Minerals, 47, 591-604.
http://dx.doi.org/10.1346/CCMN.1999.0470506
[32] Steudel, A., Batenburgm, L.F., Fisher, H.R., Weidler, P.G. and Emmerich, K. (2009) Alteration of Swelling Clays by Acid Treatment. Applied Clay Science, 44, 105-115. http://dx.doi.org/10.1016/j.clay.2009.02.002
[33] Madejová, J., Bujdák, J., Janek, M. and Komadel, P. (1998) Comparative FT-IR Study of Structural Modifications during Acid Treatment of Dioctahedral Smectites and Hectorite. Spectrochimica Acta Part A, 54, 1397-1406.
[34] Madejovà, J. (2003) FTIR Techniques in Clay Mineral Studies. Vibrational Spectroscopy, 31, 1-10. http://dx.doi.org/10.1016/S0924-2031(02)00065-6
[35] Kooli, F. and Liu, Y. (2013) Chemical and Thermal Properties of Organoclays Derived from Highly Stable Bentonite in Sulfuric Acid. Applied Clay Science, 83-84, 349-356.
http://dx.doi.org/10.1016/j.clay.2013.07.022
[36] Morgan, D.A., Shaw, D.B., Sidebottom, T.C., Soon, T.C. and Taylor, R.S. (1985) The Function of Bleaching Earths in the Processing of Palm, Palm Kernel and Coconut Oils. Journal of the American Oil Chemists’ Society, 62, 292-299. http://dx.doi.org/10.1007/BF02541394
[37] Kheok, S.C. and Lim, E.E. (1982) Mechanism of Palm Oil Bleaching by Montmorillonites Clay Activated at Various Acid Concentrations. Journal of the American Oil Chemists’ Society, 59, 129-131.
http://dx.doi.org/10.1007/BF02662259