Abstract
Photocatalytic reduction of two textile azo dyes, Naphthol Blue Black (NBB) and Disperse Blue 79 (DB79) has been carried out in colloidal WO3 and TiO2 suspensions. Under bandgap excitation of the semiconductor colloids these dyes undergo irreversible reduction as they react with the trapped electrons. The quantum efficiency for the photocatalytic reduction of these dyes were 5.4% and 4.8% for NBB and DB79 respectively. The kinetics and mechanism of the interfacial charge transfer in these colloidal suspension has been elucidated with transient absorption spectroscopy. The reaction between the dye and trapped electrons is diffusion limited and occurs with rate constants of 1.1×108 M−1s−1 and 4.0×107 M−1s−1 for NBB and DB79 respectively.
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References
A.A. Vaidya and K.V. Datye, Colourage 14, 3 (1982).
H. Zollinger, Color Chemistry: Synthesis, Properties and Applications of Organic Dyes and Pigments, VCH Publishers, New York, 1987.
W.C. Tincher, Textile Chemist and Colorist 21, 33 (1989).
M. Boeninger, DHHS (NIOSH), Publication No 80, 119 (1990).
K. Vinodgopal, I. Bedja, S. Hotchandani, and P.V. Kamat, Langmuir 10, 1767 (1994).
K. Vinodgopal and P.V. Kamat, J. Photochem. Photobiol., A: Chemistry 83, 141 (1994).
C. Nasr, K. Vinodgopal, S. Hotchandani, and P.V. Kamat, Rad. Phys. Chem. (1996), in press.
N. Serpone and E. Pelizzetti (Eds.), Photocatalysis, Fundamentals and Applications, John Wiley and Sons, New York, 1989.
M. Anpo, Res. Chem. Intermed. 11 67 (1989).
W.A. Zeltner, C.G. Hill, jr., and M.A. Anderson, Chem. Tech. 21 (1994).
K. Rajeshwar, J. Appl. Electrochem. 25, 1067 (1995).
M.R. Hoffman, S.T. Martin, W. Choi, and D.W. Bahnemann, Chem. Rev. 95, 69 (1995).
U. Stafford, K.A. Gray, and P.V. Kamat, Heterogeneous Chemistry Reviews 3, 77 (1996).
A.L. Linsebigler, G. Lu, and J.J.T. Yates, Chem. Rev. 95, 735 (1995).
P.V. Kamat. In: Molecular Level Artificial Photosynthetic Materials. Progress in Inorganic Chemistry Series, Vol. 44, J. Meyer (Ed.), John Wiley & Sons, Inc., New York, 1996, p. 273.
K. Vinodgopal and P.V. Kamat, CHEMTECH, April 18 (1996).
F. Mahadevi, T.C. Burton, and Y. Li, J. Org. Chem. 58, 744 (1993).
D. Schmelling, K.A. Gray, and P.V. Kamat, Environ. Sci. Technol. 30, 2547 (1996).
M.T. Nenadovic, T. Rajh, O.I. Micic, and A.J. Nozik, J. Phys. Chem. 88, 5827 (1984).
I. Bedja, S. Hotchandani, and P.V. Kamat, J. Phys. Chem. 97, 11064 (1993).
P.V. Kamat, I. Bedja, and S. Hotchandani, J. Phys. Chem. 98, 9137 (1994).
D. Bahnemann, A. Henglein, J. Lilie, and L. Spanhel, J. Phys. Chem. 88, 709 (1984).
C. Arbour, D.K. Sharma, and C.H. Langford, Photochemistry and Photophysics of Coordination Compounds, Springer Verlag, Berlin, 1987.
J.E. Evans, K.W. Springer, and J.Z. Zhang, J. Chem. Phys. 101, 6222 (1994).
P.V. Kamat and K. Vinodgopal. In: Fine Particles Science and Technology: From Micro to Nanoparticles, E. Pelizzetti (Ed.), Kluwer Academic Publishers, Dordrecht, The Netherlands, 1996, p. 303.
N. Serpone, d. Lawless, R. Khairutdinov, and E. Pelizzetti, J. Phys. Chem. 99, 16655 (1995).
I. Carmichael and G.L. Hug, J. Phys. Chem. Ref. Data 15, (1986).
D. Bahnemann, J. Cunningham, M.A. Fox, E. Pelizzetti, P. Pichat, and N. Serpone. In: Aquatic and Surface Chemistry, G.R. Helz, R.G. Zepp, and D.G. Crosby (Eds.), Lewis Publishers, Boca Raton, Florida, 1994, p. 261.
P.V. Kamat, Progr. React. Kinetics 19, 277 (1994).
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Nasr, C., Vinodgopal, K., Hotchandani, S. et al. Photocatalytic reduction of azo dyes Naphthol Blue Black and Disperse Blue 79. Res. Chem. Intermed. 23, 219–231 (1997). https://doi.org/10.1163/156856797X00439
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DOI: https://doi.org/10.1163/156856797X00439