Kinetic model of photocatalytic oxidation of dye (Orange II) by superoxide radicals
Abstract
The kinetics of photocatalytic decomposition of dye (Orange II) in the presence of titanium (IV) dioxide was studied. A presented kinetic model takes into account the active forms of particles involved in the process of photocatalytic oxidation. By adding various scavengers, it was found that superoxide radicals (O2•-) play the most significant role in dye photodegradation. Tert-butanol (t-BuOH), ammonium oxalate (OA), sodium azide (NaN3), 4-hydroxy-TEMPO (TEMPOL) and dimethyl sulfoxide (DMSO) were used as scavengers with a final concentration of 10 mM of hydroxide radicals (•OH), holes (h+), singlet oxygen (1O2), superoxide radicals (O2•-) and electrons (e-) in 40 ml of Orange II solution. The proposed kinetic model includes the following stages: photogeneration of particles, formation of superoxide radicals and their interaction with organic dye, products and inactive surfaces. Studies were conducted to determine the kinetic parameters of the reaction, particularly the order of Orange II photodegradation, showed that the reaction follows a pseudo-first-order kinetics, which is consistent with the proposed kinetic model. The resulting linear dependence of ln(C0/C) with time shows that the photodecomposition reaction of Orange II is a pseudo-first order reaction, the rate constant of which is (35.1 ± 1.3).10-3 min-1.
References
2 Miranda-García N, Suárez S, Sánchez B, Coronado JM, Malato S, Maldonado MI (2011) Appl Catal B-Environ 103:294-301. Crossref
3 Carp O (2004) Prog Solid State Chem 32:33-177. Crossref
4 Wang Y, Wang Q, Zhan X, Wang F, Safdar M, He J (2013) Nanoscale 5:8326-8339. Crossref
5 Guo Q, Zhou C, Ma Z, Yang X (2019) Adv Mater 31:e1901997. Crossref
6 Magalhães P, Andrade L, Nunes OC, Mendes A (2017) Rev Adv Mater Sci 51(2):91-129
7 Chen C, Ma W, Zhao J (2010) Chem Soc Rev 39:4206-4219. Crossref
8 Martin ST, Lee AT, Hoffmann MR (1995) Environ Sci Technol 29(10):2567-2573. Crossref
9 Lawless D, Serpone N, Meisel D (1991) J Phys Chem 95(13):5166-5170. Crossref
10 Serpone N, Texier I, Emeline AV, Pichat P, Hidaka H, Zhao J (2000) J Photoch Photobio A 136:145-155. Crossref
11 Pastrana-Martínez LM, Faria JL, Doña-Rodríguez JM, Fernández-Rodríguez C, Silva AMT (2012) Appl Catal B-Environ 113-114:221-227. Crossref
12 Hoffmann MR, Martin ST, Choi W, Bahnemann DW (1995) Chem Rev 95:69-96. Crossref
13 Daneshvar N, Rabbani M, Modirshahla N, Behnajady MA (2004) J Photoch Photobio A 168:39-45. Crossref
14 Meng A, Zhang L, Cheng B, Yu J (2019) Adv Mater 31(30):1807660. Crossref
15 Abdullah H, Khan MMR, Ong HR, Yaakob Z (2017) J CO2 Util 22:15-32. Crossref
16 Shayegan Z, Lee C, Haghighat F (2018) Chem Eng J 334:2408-2439. Crossref
17 Beranek R, Kisch H (2007) Electrochem Commun 9:761-766. Crossref
18 Konstantinou IK, Albanis TA (2003) Appl Catal B-Environ 42:319-335. Crossref
19 Tulebekov Y, Orazov Z, Satybaldiyev B, Snow D, Schneider R, Uralbekov B (2023) Molecules 28:6451. Crossref
20 Al-Ekabi H, Serpone N (2002) J Phys Chem 92:5726-5731. Crossref
21 Chan Y, Chen J, Lu M (2001) Chemosphere 45:29-35. Crossref
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