Characterization of Stone Powder/TiO2 Core/Shell Composite Particles Prepared from TiO2 Nanoparticles via Heterocoagulation in a Water System

Seong-Tae Hwang; Youn-Seop Byoun; Yoon Bong Hahn; Kee Suk Nahm; Youn-Sik Lee

Journal of Industrial and Engineering Chemistry, Vol.11, No.1, 110-116, January, 2005

Seong-Tae Hwang, Youn-Seop Byoun¹, Yoon Bong Hahn , Kee Suk Nahm , and Youn-Sik Lee^†

Division of Environmental and Chemical Engineering, Nanomaterials Research Center, Chonbuk National University, Chonju 561-756, Korea
¹Division of Environmental and Chemical Engineering, Howon University, Kunsan 573-718, Korea

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Stone powder (SP)/TiO2 core/shell composites were prepared from SP and nano-crystalline TiO2 sols as the core and shell particles, respectively, via heterocoagulation. The dispersion stability of the particles has been investigated, on the basis of the DLVO and heterocoagulation theories, as a function of the pH and concentration of surfactants. The core/shell composite particles were characterized as a function of the weight ratio of SP/TiO2 by various techniques, such as XRD, FE-SEM, N2 adsorption, ASC, and their photocatalytic activities for the decomposition of methylene blue (MB) in water. The optimum value of pH for the preparation of the SP/TiO2 core/shell particles was 3.5. The homogeneous TiO2 coating was obtained when the weight ratio of SP/TiO2 was 80/20. The ASC and BET surface area of the prepared SP/TiO2 (80/20) particles were 91% and 60.6 m2/g, respectively. THe SP/TiO2 core/shell particles, prepared by the heterocoagulation method, exhibited efficient photocatalytic activities toward the decomposition of MB, which was increased with respect to the UV irradiation time and the TiO2 loading.

Keywords:stone powder;nano-TiO2;core/shell composite;heterocoagulation

[References]

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Cheng P, Zheng M, Jin Y, Huang Q, Gu M, Mater. Lett., 57, 2989 (2003)
Lee MS, Lee GD, Hong SS, J. Ind. Eng. Chem., 9(4), 412 (2003)
Hanprasopwattana A, Srinivasan S, Sault AG, Datye AK, Langmuir, 12(13), 3173 (1996)
Castillo R, Koch B, Ruiz P, Delmon B, J. Mater. Chem., 4, 903 (1994)
Brinker CJ, Scherer GW, Sol-Gel Science, p. 216, Academic Press, San Diego (1990)
Kim KD, Kim HT, Colloids Surf. A: Physicochem. Eng. Asp., 207, 263 (2001)
Giesche H, J. Dispersion Sci. Technol., 19, 249 (1998)
Hwang ST, Jheong GR, Lee YS, Ko SB, Byoun YS, J. Ind. Eng. Chem., 10(6), 927 (2004)
Kim CK, Sohn JS, Kim BG, Sohn YU, A study on the utilization of stone powder sludge, Korea Institute of Geoscience and Mineral Resources (1996)
Shaw DJ, Introduction to Colloid & Surface Chemistry, 4th ed., p. 176, Butterworth Heinemann (1992)
Ohshima H, Furusawa K, Electrical Phenomena at Interfaces. Fundamentals, measurements, and applications, 2nd Edn., Marcel Dekker (1998)
Minerals & Materials Research Institute, Korea Resources Corporation, 53, 1 (1995)
Lee E, Chu JW, Hsu JP, J. Colloid Interface Sci., 209(1), 240 (1999)
Pierre AC, Introduction to sol-gel processing, p. 127, Kluwer Academic Publishers, Dordrecht (1998)

[Related Articles]

[1] vanGrieken R, Aguado J, Lopez-Munoz MJ, Marugan J, J. Photochem. Photobiol. A-Chem., 148, 315 (2002)

[2] Cheng P, Zheng M, Jin Y, Huang Q, Gu M, Mater. Lett., 57, 2989 (2003)

[3] Lee MS, Lee GD, Hong SS, J. Ind. Eng. Chem., 9(4), 412 (2003)

[4] Hanprasopwattana A, Srinivasan S, Sault AG, Datye AK, Langmuir, 12(13), 3173 (1996)

[5] Castillo R, Koch B, Ruiz P, Delmon B, J. Mater. Chem., 4, 903 (1994)

[6] Brinker CJ, Scherer GW, Sol-Gel Science, p. 216, Academic Press, San Diego (1990)

[7] Kim KD, Kim HT, Colloids Surf. A: Physicochem. Eng. Asp., 207, 263 (2001)

[8] Giesche H, J. Dispersion Sci. Technol., 19, 249 (1998)

[9] Hwang ST, Jheong GR, Lee YS, Ko SB, Byoun YS, J. Ind. Eng. Chem., 10(6), 927 (2004)

[10] Kim CK, Sohn JS, Kim BG, Sohn YU, A study on the utilization of stone powder sludge, Korea Institute of Geoscience and Mineral Resources (1996)

[11] Shaw DJ, Introduction to Colloid & Surface Chemistry, 4th ed., p. 176, Butterworth Heinemann (1992)

[12] Ohshima H, Furusawa K, Electrical Phenomena at Interfaces. Fundamentals, measurements, and applications, 2nd Edn., Marcel Dekker (1998)

[13] Minerals & Materials Research Institute, Korea Resources Corporation, 53, 1 (1995)

[14] Lee E, Chu JW, Hsu JP, J. Colloid Interface Sci., 209(1), 240 (1999)

[15] Pierre AC, Introduction to sol-gel processing, p. 127, Kluwer Academic Publishers, Dordrecht (1998)