Enhanced Eosin Mineralization in Presence of Au(III) Ions in Aqueous Solutions Containing TiO2 as Suspension
DOI:
https://doi.org/10.6000/1929-5030.2017.06.01.3Keywords:
TiO2, Photolysis, Au(III) ions, Eosin, Gold nanoparticles, Mineralization.Abstract
Photo-catalytic mineralization of eosin in aerated 0.1% (w/v) TiO2 suspended aqueous systems with and without Au3+using 350 nm photo light was carried out. Eosin mineralization rate was significantly faster in 2×10-4 M Au3+containing systems in contrast to sole TiO2 systems, which is due to the participation of Au3+and it’s in situ generated various reduced intermediates including gold nanoparticles during mineralization. Furthermore, pulse radiolysis (a well known transient measurement technique) was adopted to analyze the reaction intermediates (eosin-OH adducts and/or eosin radical cation) produced in mineralization by generating in situ •OH and N3• species. The reaction rates for •OH and N3• reactions with eosin evaluated respectively 5.4×109 and 3.0×109 dm3 mol-1 s-1 for the formation of radical cations were slower than the eosin-OH adduct formation rate (reaction rate = 1.4×1010 dm3 mol-1 s-1). Furthermore, it is proposed that the initially generated eosin-•OH/hole adduct is undergoing mineralization in the presence of air/oxygen.
References
[1] Eosin as carcinogen: http://www.ihcworld.com/royellis/ ABCSafe/chemicals/eosin-y.htm accessed on 24 June 2016
[2] Eosin hazard: http://cameochemicals.noaa.gov/chemicals/ 20332 accessed on 24 June 2016
[3] Bahenmann DW. in Pelizzetti E, Schiavello M, Eds. Photochemical conversion and storage of solar energy, Kluwer, Dordrecht 1991; p. 251.
[4] Hoffmann MR, Martin ST, Choi W, Bahenmann DW. Applications of semiconductor photocatalysis. Chem Rev 1995; 95: 69-96. https://doi.org/10.1021/cr00033a004
[5] Spinks JWT, Woods RJ, Eds. An Introduction to Radiation Chemistry, 3rd edn., Wiley, New York 1990.
[6] Tabata Y, Ed. Pulse Radiolysis, CRC Press, Boca Raton 1991.
[7] Yin M, Li Z, Kou J, Zou Z. Mechanism Investigation of Visible light-Induced Degradation in a Heterogeneous TiO2/Eosin Y/Rhodamine B System. Environ Sci Technol 2009; 43: 8361-8366. https://doi.org/10.1021/es902011h
[8] Zhang F, Zhao J, Shen T, Hidaka H, Pelizzetti E, Serpone N. TiO2-assisted photodegradation of dye pollutants II. Adsorption and degradation kinetics of eosin in TiO2 dispersions under visible light irradiation. Appl Catal B Environ 1998; 15: 147-156. https://doi.org/10.1016/S0926-3373(97)00043-X
[9] Ayati A, Ahmadpour A, Bamoharram FF, Tanhaei B, Mänttäri M, Sillanpäa M. A review on catalytic applications of Au/TiO2 nanoparticles in the removal of water pollutant. Chemosphere 2014; 107: 163-174. https://doi.org/10.1016/j.chemosphere.2014.01.040
[10] Padikkaparambil S, Narayanan B, Yaakob Z, Viswanathan S, Tasirin SM. Au/TiO2 reusable photocatalysts for dye degradation. Internat. J Photoener 2013; Article ID 752605,10 pages.
[11] Dey GR, Belapurker AD, Kishore K. Photoreduction of carbon dioxide to methane using TiO2 as suspension in water. J Photochem Photobiol A Chem 2004; 163: 503-508. https://doi.org/10.1016/j.jphotochem.2004.01.022
[12] Liang H. Study on the Effects of the Preparation Conditions on the Combination of Eosin Dye and TiO2. Appl Mech Mater 2014; 526: 86-90. https://doi.org/10.4028/www.scientific.net/AMM.526.86
[13] Li B, Wang X, Yan M, Li L. Preparation and characterization of nano-TiO2 powder. Mater Chem Phys 2002; 78: 184-188. https://doi.org/10.1016/S0254-0584(02)00226-2
[14] Gao Y, Fan X-B, Zhang W-F, Zhao Q-S, Zhang G-L, Zhang F-B, Li Y. Enhanced photocatalytic degradation of methyl orange by Au/TiO2 nanotubes. Mater Lett 2014; 130: 1-4. https://doi.org/10.1016/j.matlet.2014.05.076
[15] Doremus RH. Optical Properties of Small Gold Particles. J Chem Phys 1964; 40: 2389-2396. https://doi.org/10.1063/1.1725519
[16] Belapurkar AD, Kamble VS, Dey GR. Photooxidation of ethylene in gas phase and methanol and formic acid in liquid phase on synthesized TiO2 and Au/TiO2 catalysts. Mater Chem Phys 2010; 123: 801-805. https://doi.org/10.1016/j.matchemphys.2010.05.063
[17] Dey GR. Effects of metal ions on H2 generation during photolysis of suspended TiO2 in aqueous systems under different ambient conditions. J Appl Sol Chem Model 2015; 4: 63-71. https://doi.org/10.6000/1929-5030.2015.04.01.5
[18] Choi HC, Jung YM, Kim SB. Size effects in the Raman spectra of TiO2 nanoparticles. Vib Spec 2005; 37: 33-38. https://doi.org/10.1016/j.vibspec.2004.05.006
[19] Kamat PV. Photochemistry on Nonreactive and Reactive (Semiconductor) Surface. Chem Rev 1993; 93: 267-300. https://doi.org/10.1021/cr00017a013
[20] Dey GR. Significant roles of oxygen and unbound • OH radical in phenol formation during photocatalytic degradation of benzene on TiO2 suspension in aqueous system. Res Chem Intermed 2009; 35: 573-587. https://doi.org/10.1007/s11164-009-0066-0
[21] Guha SN, Moorthy PN, Kishore K, Naik, DB, Rao KN. One electron reduction of thionine studied by pulse radiolysis. Proc Indian Acad Sci (Chem Sci) 1987; 99: 261-271.
[22] Buxton GV, Stuart CR. Re-evaluation of the thiocyanate dosimeter for pulse radiolysis. J Chem Soc Faraday Trans. 1995; 91: 279-281. https://doi.org/10.1039/ft9959100279
[23] Buxton GV, Greenstock CL, Helman WP, Ross AB. Critical review of rate constants for reactions of hydrated electron, hydrogen atoms and hydroxyl radicals (OH/O- ) in aqueous solution. J Phys Chem Ref Data 1988; 17: 513-886. https://doi.org/10.1063/1.555805
[24] Grossweiner LI, Rodde AF, Sandberg JG, Chrysochoos J. Pulse Radiolysis of Aqueous Eosin. Nature 1966; 210: 1154- 1156. https://doi.org/10.1038/2101154a0
[25] Chrysochoos J, Ovadia J, Grossweiner LI. Pulse Radiolysis of Aqueous Eosin. J Phys Chem 1967; 71: 1629-1636. https://doi.org/10.1021/j100865a014
[26] Dey GR, Hermann R, Naumov S, Brede O. Encounter geometry determines product characteristics of electron transfer from 4-hydroxythiophenol to n-butyl chloride radical cations. Chem Phys Let 1999; 310:137-144. and reference therein.
[27] Subramanian V, Wolf EE, Kamat PV. Effect of metal particle size on the fermi level equilibration. J Am Chem Soc 2004; 126: 4943-4950. https://doi.org/10.1021/ja0315199
[28] Kamat PV. Photoinduced transformations in semiconductor– metal nanocomposite assemblies. Pure Appl Chem 2002; 74: 1693-1706. https://doi.org/10.1351/pac200274091693
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2017-04-01
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Dey, G., & Singh, P. (2017). Enhanced Eosin Mineralization in Presence of Au(III) Ions in Aqueous Solutions Containing TiO2 as Suspension. Journal of Applied Solution Chemistry and Modeling, 6(1), 28–36. https://doi.org/10.6000/1929-5030.2017.06.01.3
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