Photocatalytic Study of some Common Allergens and Harmful Ingredients used in Everyday Products
J. Environ. Nanotechnol., Volume 5, No 3 (2016) pp. 01-08
Abstract
The photocatalytic degradation of allergens such as triclosan on various semiconductor photocatalysts like TiO2, ZnO, WO3, Ag/TiO2 and Pd/TiO2 and isothiazolin-3-ones on WO3 in aqueous suspensions under different illumination conditions has been investigated. The degradation of triclosan was monitored by TOC disappearance, carbon dioxide evolution and chloride ion formation. It is shown that TiO2 exhibited the best photocatalytic efficiency compared to the other catalysts studied. Silver loaded TiO2 performed better than PdO/ TiO2. The photocatalytic degradation of isothiazolin-3-ones on WO3 was followed by UV-Vis spectrophotometry, total organic carbon (TOC), Gas chromatography (GC), High Pressure Liquid Chromatography (HPLC) and Ion Chromatography techniques. The degradation reaction is fast under suntest and then UV lamp, when it is compared to fluorescent lamps. The reaction proceeds faster in the presence of O2 than in other atmospheric conditions such as air, H2O2. The photocatalytic activity of WO3 is compared with TiO2 and ZnO. This study proves the viability of photocatalytic degradation of triclosan and isothiazolin-3-ones in an aqueous medium.
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Reference
Crow, W.D. and Gosney, I., Isothiazole chemistry. VI. Reactions of carbanions with N-ethyl-3-isothiazolone, Aust. J. Chem., 22(4), 765-774(1969).
https://doi.org/10.1071/CH9690765
Ge, M. Cao, C. Huang, J. Li, S. Chen, Z. Zhang, K.Q. Al-Deyab, S.S. and Lai, Y., A review of one dimensional TiO2 nanostructured materials for environmental and energy applications, J. Mater. Chem. A., 4(18), 6772-6801(2016).
https://doi.org/10.1039/C5TA09323F
Jerschow, E. Hostynek, J.J. and Maibach, H.I., Allergic Contact dermatitis elicitation thresholds of potent allergens in humans, Food and Chem. Toxicol., 39(11), 1095-1108(2001).
https://doi.org/10.1016/S0278-6915(01)00059-x
Kolpin, D.W. Furlong, E.T. Meyer, M.T. Thurman, E.M. Zaugg, S.D. Barber, L.B. and Buxton, H.T., Pharmaceuticals, hormones, and other organic waste water contaminants in US streams, 1999-2000: A national reconnaissance, Envi. Sci. Technol., 36(6) 1202-1211(2002).
https://doi.org/10.1021/es011055j
Kormann, C. Bahnemann, D. and Hoffmann, M.R., Photocatalytic production of hydrogen peroxides and organic peroxides in aqueous suspensions of Titanium dioxide, zinc oxide and desert sand, Environ. Sci. Technol., 22(7) 798-806(1988).
https://doi.org/10.1021/es00172a009
Latch, D. E. Packer, J. L. Arnold, W. A. and McNeill, K., Photochemical conversion of triclosan to 2,8-dichlorodibenzo-p-dixoin in aqueous solution, J. Photochem. Photobiol. A: Chem., 158(1), 63-66(2003).
https://doi.org/10.1016/S1010-6030(03)00103-5
Lindstrom, A. Buerge, I.J. Poiger, T. Bergqvist, P. Muller, M. D. and Buser, H. R., Occurrence and environmental behavior of the bactericide Triclosan and its methyl derivatives in surface waters and in waste water, Envi. Sci. Technol., 36(11) 2322-2329(2002).
https://doi.org/10.1021/es0114254
Pastore, M. and Etieene, T. and De Angelis, F., Structural and electronic properties of dye sensitized TiO2 for solar cell applications: from single moelcules to self-assembled monolayers, J. Mater. Chem. C, 4(20), 4346-4373(2016).
https://doi.org/10.1039/C6TC00554C
Tanaka, K. Padermpole, K.and Hisanaga, T., Photocatalytic degradation of commercial azo dyes, Water. Res., 34(1), 327-333(2000).
https://doi.org/10.1016/S0043-1354(99)00093-7
Tixier, C. Singer, H. P. Canonica, S. and Muller. S. R., Phototransformation of Triclosan in surface waters: A relevant elimination process for this widely used biocide-Laboratory studies, Field Measurements and Modeling, Envi. Sci. Technol., 36(16), 3482-3489(2002).
