Possible degradation pathways of triclosan from aqueous systems via TiO2 assisted photocatalyis

Lucian Alexandru Constantin; Ines Nitoi; Nicolae Ionut Cristea; Mirela Alina Constantin

Journal of Industrial and Engineering Chemistry, Vol.58, 155-162, February, 2018

DOI10.1016/j.jiec.2017.09.020 Export Citation

Possible degradation pathways of triclosan from aqueous systems via TiO2 assisted photocatalyis

Lucian Alexandru Constantin^{1, †}, Ines Nitoi¹, Nicolae Ionut Cristea^{1, 2}, and Mirela Alina Constantin¹

¹National Research and Development Institute for Industrial Ecology, ECOIND, 71-73 Drumul Podu Dambovitei St., Bucharest-6, 060652, Romania
²Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Gheorghe Polizu St., Bucharest-1, 011061, Romania

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Triclosan (TCS) is an antimicrobial agent used for personal care products that cannot be removed by wastewater treatment classical processes. TCS persistence and toxicity is asking for alternative treatment methods such as TiO2 assisted photocatalyse. Due to the fact that within the literature are presented various pathways for TCS degradation via UV/TiO2 photocatalysis, some data being contradictory, research work aimed to propose a degradation mechanism supported by as many experimental data. TCS degradation pathways confirmed by experimental results were: addition of hydroxyl radicals at TCS non-phenolic ring, proton extraction by hydroxyl radicals and direct interaction with photo generated electrons.

Keywords:Triclosan;Photocatalyse;TiO2 anatase

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[1] Aranami K, Readman J, Chemosphere, 66, 1052 (2007)

[2] Sanchez-Prado L, Llompart M, Lores M, Garcia-Jares C, Bayona J, Cela R, Chemosphere, 65, 1338 (2006)

[3] Lindstrom A, Buerge I, Poiger T, Bergqvist P, Muller M, Buser, Environ. Sci. Technol., 36, 2322 (2002)

[4] Ying G, Kookana R, Environ. Int., 33, 199 (2007)

[5] Cantwell M, Wilson B, Zhu J, Wallace G, King J, Olsen C, Burgess R, Smith J, Chemosphere, 78, 347 (2010)

[6] Nitoi I, Oancea P, Raileanu M, Crisan M, Constantin L, Cristea I, J. Ind. Eng. Chem., 21, 677 (2015)

[7] Yang B, Ying GG, Zhao JL, Zhang LJ, Fang YX, Nghiem LD, J. Hazard. Mater., 186(1), 227 (2011)

[8] Pouran SR, Aziz ARA, Daud WMAW, J. Ind. Eng. Chem., 21, 53 (2015)

[9] Jung C, Son A, Her N, Zoh KJ, Cho J, Yoon Y, J. Ind. Eng. Chem., 27, 1 (2015)

[10] Khraisheh M, Kim J, Campos L, Al-Muhtaseb AH, Al-Hawari A, Ghouti MA, Walker GM, J. Ind. Eng. Chem., 20(3), 979 (2014)

[11] Rafqah S, Wong-Wah-Chung P, Nelieu S, Einhorn J, Sarakha M, Appl. Catal. B: Environ., 66(1-2), 119 (2006)

[12] Yu J, Kwong T, Luo Q, Cai Z, Chemosphere, 65, 390 (2006)

[13] Son HS, Ko G, Zoh KD, J. Hazard. Mater., 166(2-3), 954 (2009)

[14] Song Z, Wang N, Zhu L, Huang A, Zhao X, Tang H, Chem. Eng. J., 189-199, 379 (2012)

[15] Munoz M, de Pedro Z, Casas J, Rodriguez J, Chem. Eng. J., 198-199, 275 (2012)

[16] Gumy D, Giraldo SA, Rengifo J, Pulgarin C, Appl. Catal. B: Environ., 78(1-2), 19 (2008)

[17] Constantin L, Nitoi I, Cristea I, Oancea P, Orbeci C, Nechifor A, Rev. Chim., 66, 597 (2015)

[18] Zhang X, Zhang CX, Sun XM, Kang LY, Zhao Y, Int. J. Mol. Sci., 16(4), 8128 (2015)

[19] Li X, Cubbage J, Tetzlaff T, Jenks W, J. Org. Chem., 64, 8509 (1999)

[20] Mills G, Hoffmann M, Environ. Sci. Technol., 27, 1681 (1993)

[21] Chen C, Lei P, Ji H, Ma W, Zhao J, Environ. Sci. Technol., 38, 329 (2004)

[22] Hu C, Yu JC, Hao ZP, Wong PK, Appl. Catal. B: Environ., 42(1), 47 (2003)

[23] Wen S, Zhao J, Sheng G, Fu J, Peng P, Chemosphere, 50, 111 (2003)

[24] Ferrer I, Mezcua M, Gomez M, Thurman E, Aguera A, Hernandez M, Fernandez-Alba A, Rapid Commun. Mass Spectrom., 18, 443 (2004)