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Received May 3, 2017
Accepted June 24, 2017
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Purification of textile wastewater by using coated Sr/S/N doped TiO2 nanolayers on glass orbs
Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, P. O. Box 87317-51167, Kashan, Iran 1Department of Chemistry, University of Zabol, P. O. Box 98615-538, Zabol, Islamic Republic of Iran
Korean Journal of Chemical Engineering, July 2018, 35(7), 1441-1449(9), 10.1007/s11814-017-0176-0
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Abstract
Simultaneous doping of TiO2 nanoparticles with three elements including Sr, S, and N is reported. The resulting material shows superior photocatalytic performance toward degradation of textile waste under visible and sunlight. The pure and doped TiO2 nanolayers were prepared by sol-gel method and were fixed on a bed of glass orbs. The immobilized TiO2 were characterized by a variety of techniques: X-ray diffraction (XRD), scanning electron microscopy (SEM), spectroscopy diffusion reflection (DRS), energy dispersive X-ray spectrometry (EDS) and elemental analysis (CHNS). The photocatalytic activity of the prepared fixed-bed materials toward degradation of the textile wastes was determined by using ultraviolet-visible spectroscopy (UV-Vis) and measurement of the chemical oxygen demand testing (COD). The best photocatalytic activity was observed with the use of Sr/S/N-TiO2 nano-layers. Afterwards, the experimental conditions were optimized by tuning reaction parameters, including amount of doped metal ion on photocatalyst structure, sample solution pH and photoreactor output flow rate. The results confirmed that at natural pH 5.9 of sample solution, maximum decomposition of 91-99% of azo dyes was obtained in 8 h under visible irradiation. Finally, the experiments were repeated under 1.5 AM sunlight with high volume of reactants in order to confirm the cost-effectiveness of the designed photocatalyst.
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References
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Suzuki H, Araki S, Yamamoto H, J. Water. Proc. Eng., 7, 54 (2015)
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Malengreaux CM, Leonard GML, Pirard SL, Cimieri I, Lambert SD, Bartlett JR, Heinrichs B, Chem. Eng. J., 243, 537 (2014)
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Sonawane RS, Kale BB, Dongare MK, Mater. Chem. Phys., 85(1), 52 (2004)
Zahedi F, Behpour M, Ghoreishi SM, Khalilian H, Sol. Energy, 120, 287 (2015)
Behpour M, Atouf V, Appl. Surf. Sci., 258(17), 6595 (2012)
Pelaez M, Nolan NT, Pillai SC, Seery MK, Falaras P, Kontos AG, Dunlop PSM, Hamilton JWJ, Byrne JA, O'Shea K, Entezari MH, Dionysiou DD, Appl. Catal. B: Environ., 125, 331 (2012)
Zhang J, Zhou P, Liu J, Yu J, Phys. Chem. Chem. Phys., 16, 20382 (2014)
Ma LQ, Xu WC, Zhu SL, Cui ZD, Yang XJ, Inoue A, Mater. Chem. Phys., 170, 186 (2016)
Macwan DP, Dave PN, Chaturvedi S, J. Mater. Sci., 46(11), 3669 (2011)
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Rattanakam R, Supothina S, Res. Chem. Intermed., 35, 263 (2009)
Mamane H, Horovitz I, Lozzi L, Di Camillo D, Avisar D, Chem. Eng. J., 257, 159 (2014)
Sood S, Umar A, Mehta SK, Sinha ASK, Kansal SK, Ceram. Int., 41, 3533 (2015)
Zahedi F, Behpour M, Ghoreishi SM, Khalilian H, Sol. Energy, 120, 287 (2015)
Konstantinou IK, Albanis TA, Appl. Catal. B: Environ., 49(1), 1 (2004)
Hsieh SH, Chen WJ, Wu CT, Appl. Surf. Sci., 340, 9 (2015)
