Synthesis of N-F-codoped TiO2/SiO2 nanocomposites as a visible and sunlight response photocatalyst for simultaneous degradation of organic water pollutants and reduction of Cr (VI)
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A new N-F-codoped TiO2/SiO2 nanocomposite was prepared by simple sol-gel method, and strongly stabilized on a substrate used in a fabricated photoreactor. The prepared photocatalysts were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, diffuse reflectance UV/Vis, photoluminescence, field emission scanning electron microscope, energy dispersive X-ray, transmission electron microscope, and N2 adsorption/desorption methods. The effective parameters of pH, flow rate of the incoming current, and the photoreactor tubes angle against sunlight were optimized. The photocatalytic performance of prepared photocatalysts was evaluated by studying the simultaneous removal of a mixture containing three azo dyes and Cr (VI) in the fabricated continuous-flow photoreactor under visible and solar irradiation. The performance of the designed system was also proved under various outdoor climate conditions. Total organic carbon and flame atomic absorption spectroscopy analysis were performed on the treated sample to confirm the decontamination of the model pollutant mixture. It was found that doping N and F in TiO2/SiO2 nanoparticles caused least agglomeration, enhanced activity under visible and solar irradiation, and fully anatase crystalline structure in the as-synthesized nanoparticles.
N-F-codoped TiO2/SiO2 nanocomposites were synthesized using a simple sol-gel process.
The nanocomposites were stabilized on the glass beads’ surface by coupling two coating methods.
A photoreactor with adjustable effective parameters was fabricated.
The photoremovals were successfully tested on a mixture of some organic and inorganic pollutants.
Different outdoor climate conditions were efficaciously investigated.
KeywordsN-F-codoped Reduction of Cr (VI) Organic water pollutants Photocatalysis Titanium dioxide
We gratefully appreciate the hard work of the staff of Razi Lab Complex of Islamic Azad University, Science and Research Branch.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 2.Wu Y, Xing M, Tian B et al. (2010) Preparation of nitrogen and fluorine co-doped mesoporous TiO2 microsphere and photodegradation of acid orange 7 under visible light. Chem Eng J 162:710–717Google Scholar
- 3.Wang Q, Chen X, Yu K et al. (2013) Synergistic photosensitized removal of Cr(VI) and Rhodamine B dye on amorphous TiO2 under visible light irradiation. J Hazard Mater 246–247:135–144Google Scholar
- 4.Papadam T, Xekoukoulotakis NP, Poulios I, Mantzavinos D (2007) Photocatalytic transformation of acid orange 20 and Cr(VI) in aqueous TiO2 suspensions. J Photochem Photobiol A Chem 186:308–315Google Scholar
- 6.Zhang J, Zhou P, Liu J, Yu J (2014) New understanding of the difference of photocatalytic activity among anatase, rutile and brookite TiO2. Phys Chem Chem Phys 16:20382–20386Google Scholar
- 8.Dette C, Pérez-Osorio MA, Kley CS et al. (2014) TiO2 anatase with a bandgap in the visible region. Nano Lett 14:6533–6538Google Scholar
- 9.Bangkedphol S, Keenan HE, Davidson CM et al. (2010) Enhancement of tributyltin degradation under natural light by N-doped TiO2 photocatalyst. J Hazard Mater 184:533–537Google Scholar
- 10.Zhang G, Zhang YC, Nadagouda M et al. (2014) Visible light-sensitized S, N and C co-doped polymorphic TiO2 for photocatalytic destruction of microcystin-LR. Appl Catal B Environ 144:614–621Google Scholar
- 11.Asahi R, Morikawa T, Ohwaki T, Taga Y. (2001) Visible-light photocatalysis in nitrogen-doped titanium oxides. Science 293:269–271Google Scholar
- 12.Dozzi MV, Selli E (2013) Doping TiO2 with p-block elements: effects on photocatalytic activity. J Photochem Photobiol C Photochem Rev 14:13–28Google Scholar
- 13.Gombac V, De Rogatis L, Gasparotto A et al. (2007) TiO2 nanopowders doped with boron and nitrogen for photocatalytic applications. Chem Phys 339:111–123Google Scholar
- 14.Ding X, Song X, Li P et al. (2011) Efficient visible light driven photocatalytic removal of NO with aerosol flow synthesized B, N-codoped TiO2 hollow spheres. J Hazard Mater 190:604–612Google Scholar
- 15.Pol R, Guerrero M, Garcia-Lecina E et al. (2016) Ni-, Pt- and (Ni/Pt)-doped TiO2 nanophotocatalysts: a smart approach for sustainable degradation of Rhodamine B dye. Appl Catal B Environ 181:270–278Google Scholar
- 17.Khalilian H, Behpour M, Atouf V, Hosseini SN (2015) Immobilization of S, N-codoped TiO2 nanoparticles on glass beads for photocatalytic degradation of methyl orange by fixed bed photoreactor under visible and sunlight irradiation. Sol Energy 112:239–245Google Scholar
- 18.Yao N, Wu C, Jia L et al. (2012) Simple synthesis and characterization of mesoporous (N, S)-codoped TiO2 with enhanced visible-light photocatalytic activity. Ceram Int 38:1671–1675Google Scholar
- 19.Yu J, Zhou M, Cheng B, Zhao X (2006) Preparation, characterization and photocatalytic activity of in situ N,S-codoped TiO2 powders. J Mol Catal A Chem 246:176–184Google Scholar
- 20.Xie Y, Li Y, Zhao X (2007) Low-temperature preparation and visible-light-induced catalytic activity of anatase F-N-codoped TiO2. J Mol Catal A Chem 277:119–126Google Scholar
- 21.Pang D, Qiu L, Wang Y et al. (2015) Photocatalytic decomposition of acrylonitrile with N–F codoped TiO2/SiO2 under simulant solar light irradiation. J Environ Sci 33:169–178Google Scholar
- 22.Anderson C, Bard AJ (1995) An improved photocatalyst of TiO2/SiO2 prepared by a Sol-Gel synthesis. J Phys Chem 99:9882–9885Google Scholar
- 23.Mahesh KPO, Kuo DH, Huang BR et al (2014) Chemically modified polyurethane-SiO2/TiO2 hybrid composite film and its reusability for photocatalytic degradation of Acid Black 1 (AB 1) under UV light Appl Catal A Gen 475:235–241Google Scholar
- 24.Islam S, Rahman RA, Othaman Z et al. (2013) Preparation and characterization of crack-free sol-gel based SiO2-TiO2 hybrid nanoparticle film. J Sol-Gel Sci Technol 68:162–168Google Scholar
- 25.Yu JC, Yu J, Ho W et al. (2002) Effects of F- doping on the photocatalytic activity and microstructures of nanocrystalline TiO2 powders. Chem Mater 14:3808–3816Google Scholar
- 26.Schrank SG, Jose HJ, Moreira RFPM (2002) Simultaneous photocatalytic Cr(VI) reduction and dye oxidation in a TiO2 slurry reactor. J Photochem Photobiol A Chem 147:71–76Google Scholar
- 27.Yang Y, Wang G, Deng Q et al. (2014) Microwave-assisted fabrication of nanoparticulate TiO2 microspheres for synergistic photocatalytic removal of Cr(VI) and methyl orange. ACS Appl Mater Interfaces 6:3008–3015Google Scholar
- 28.Xie M, Jing L, Zhou J et al. (2010) Synthesis of nanocrystalline anatase TiO2 by one-pot two-phase separated hydrolysis-solvothermal processes and its high activity for photocatalytic degradation of rhodamine B. J Hazard Mater 176:139–145Google Scholar
- 29.File PD (1997) Card No. 21−1272. JCPDS-International Cent Diffr Data, SwartGoogle Scholar
- 30.Kaur N, Kaur S, Singh V (2016) Preparation, characterization and photocatalytic degradation kinetics of Reactive Red dye 198 using N, Fe codoped TiO2 nanoparticles under visible light. Desalin Water Treat 57:9237–9246Google Scholar
- 31.Hamadanian M, Reisi-Vanani A, Behpour M, Esmaeily AS (2011) Synthesis and characterization of Fe,S-codoped TiO2 nanoparticles: application in degradation of organic water pollutants. Desalination 281:319–324Google Scholar
- 33.Luo S, Xiao Y, Yang L et al. (2011) Simultaneous detoxification of hexavalent chromium and acid orange 7 by a novel Au/TiO2 heterojunction composite nanotube arrays. Sep Purif Technol 79:85–91Google Scholar
- 35.Konstantinou IK, Albanis TA (2004) TiO2-assisted photocatalytic degradation of azo dyes in aqueous solution: Kinetic and mechanistic investigations: a review. Appl Catal B Environ 49:1–14Google Scholar