Abstract
Single-crystal-like TiO2 is claimed to be a very promising material among various catalysts. In this study, the (N,F)-co-doped single-crystal-like TiO2 was prepared by a new molten mixing process in which the mixed nitrates were used both as a morphology modifier and an N-doping agent at the same time. The prepared samples also had well-developed (001) facet due to the addition of HF. The HF can also be an F doping agent to the material. The co-doping of N and F can diminish the band gap of TiO2 from 3.05 to 2.93 eV, therefore visible light can be used effectively by the material. In addition, NO and fluorine ions existing on the surface of the sample can also help its photocatalyticity. Therefore, the photocatalytic performance of the as-prepared sample was effectively improved.
Similar content being viewed by others
References
A. Fujishima and K. Honda: Electrochemical photocatalysis of water at semiconductor electrode. Nature 238, 37–38 (1972).
J.H. Carey, J. Lawrence, and H.M. Tosine: Photodechlorination of PCB’S in the presence of titanium dioxide in aqueous suspensions. Bull. Environ. Contam. Toxicol. 16, 697 (1976).
S.N. Frank and A.J. Bard: Heterogeneous photocatalytic oxidation of cyanide and sulfite in aqueous solutions at semiconductor powders. J. Phys. Chem. 81, 1484 (1977).
E. Perez, L. Vittorio, M.F. Torres, E. Sham, and E. Pérez: Nitrogen doped TiO2 photoactive in visible light. Mater.-Rio De Janeiro 20, 561 (2015).
A. Primo and H. Garcia: Solar photocatalysis for environment remediation. New Future Dev. Catal. 6, 145 (2013).
A. Fujishima and X. Zhang: Titanium dioxide photocatalysis: Present situation and future approaches. C. R. Chim. 9, 750 (2006).
A. Fujishima, T.N. Rao, and D.A. Tryk: Titanium dioxide photocatalysis. J. Photochem. Photobiol. Chem. 1, 1 (2000).
O.K. Varghese, M. Paulose, T.J. La Tempa, and C.A. Grimes: High-rate solar photocatalytic conversion of CO2 and water vapor to hydrocarbon fuels. Nano Lett. 9, 731 (2009).
J. Yu, Y. Wang, and W. Xiao: Enhanced photoelectrocatalytic performance of SnO2/TiO2 rutile composite films. J. Mater. Chem. A 1, 10727 (2013).
J. Yang, X. Zhang, B. Li, H. Liu, P. Sun, C. Wang, L. Wang, and Y. Liu: Photocatalytic activities of heterostructured TiO2-graphene porous microspheres prepared by ultrasonic spray pyrolysis. J. Alloys Compd. 584, 180 (2014).
B. Qiu, M. Xing, and J. Zhang: Mesoporous TiO2 nanocrystals grown in situ on graphene aerogels for high photocatalysis and lithium-ion batteries. J. Am. Chem. Soc. 136, 5852 (2014).
C. Burda, Y. Lou, X. Chen, A.C.S. Samia, J. Stout, and J. Gole: Enhanced nitrogen doping in TiO2 nanoparticles. Nano Lett. 3, 1049 (2003).
H.W. Huang, X.W. Li, J. Wang, F. Dong, P.K. Chu, T. Zhang, and Y.H. Zhang: Anionic group self-doping as a promising strategy: Band-gap engineering and multi-functional applications of high-performance CO32-doped Bi2O2CO3. ACS Catal. 5, 4094 (2015).
Z. Mesgari and J. Saien: Pollutant degradation over dye sensitized nitrogen doped titanium substances in different configurations of visible light helical flow photoreactor. Sep. Purif. Technol. 185, 129 (2017).
Q.J. Xiang, J.G. Yu, and M. Jaroniec: Tunable photocatalytic selectivity of TiO2 films consisted of flower-like microspheres with exposed {001} facets. Chem. Commun. 47, 4532 (2011).
Z.C. Lai, F. Peng, Y. Wang, H. Wang, H. Yu, P. Liub, and H. Zhao: Low temperature solvothermal synthesis of anatase TiO2 single crystals with wholly {100} and {001} faceted surfaces. J. Mater. Chem. 22, 23906 (2012).
L. Sun, Z. Zhao, Y. Zhou, and L. Liu: Anatase TiO2 nanocrystals with exposed {001} facets on graphene sheets via molecular grafting for enhanced photocatalytic activity. Nanoscale 4, 613 (2012).
J. Zhang, L. Zhang, Y. Shi, G. Xu, E. Zhang, H. Wang, Z. Kong, J. Xi, and Z. Ji: Anatase TiO2 nanosheets with coexposed {101} and {001} facets coupled with ultrathin SnS2 nanosheets as a face-to-face n–p–n dual heterojunction photocatalyst for enhancing photocatalytic activity. Appl. Surf. Sci. 420, 839 (2017).
Y. Cao, L. Zong, Q. Li, C. Li, J. Li, and J. Yang: Solvothermal synthesis of TiO2 nanocrystals with {001} facets using titanic acid nanobelts for superior photocatalytic activity. Appl. Surf. Sci. 391, 311 (2017).
D. Li, F. Chen, D. Jiang, W. Shi, and W. Zheng: Enhanced photocatalytic activity of N-doped TiO2 nanocrystals with exposed {001} facets. Appl. Surf. Sci. 390, 689 (2016).
H.G. Yang, C.H. Sun, S.Z. Qiao, J. Zou, G. Liu, S.C. Smith, H.M. Cheng, and G.Q. Lu: Anatase TiO2 single crystals with a large percentage of reactive facets. Nature 453, 638 (2008).
H.G. Yang, G. Liu, S.Z. Qiao, C.H. Sun, Y.G. Jin, S.C. Smith, J. Zou, H.M. Cheng, and G.Q. Lu: Solvothermal synthesis and photoreactivity of anatase TiO2 nanosheets with dominant {001} faces. J. Am. Chem. Soc. 131, 4078 (2009).
Y. Alivov and Z.Y. Fan: A method for fabrication of pyramid-shaped TiO2 nanoparticles with a high {001} facet percentage. J. Phys. Chem. C 113, 12954 (2009).
G. Liu, C.H. Sun, H.G. Yang, S.C. Smith, L. Wang, G.Q. Lu, and H.M. Cheng: Nanosized anatase TiO2 single crystals for enhanced photocatalytic activity. Chem. Commun. 46, 755 (2010).
S.W. Liu, G.Y. Yu, and M. Jaroniec: Tunable photocatalytic selectivity of hollow TiO2 microspheres composed of anatasepolyhedra with exposed {001} facets. J. Am. Chem. Soc. 132, 11914 (2010).
Q.F. Zhang, C.S. Dandeneau, X.Y. Zhou, and G.Z. Cao: ZnO nanostructures for dye-sensitized solar cells. Adv. Mater. 21, 4087 (2009).
J.S. Chen, Y.L. Tan, C.M. Li, Y.L. Cheah, D. Luan, S. Madhavi, F.Y. Boey, L.A. Archer, and X.W. Lou: Constructing hierarchical spheres from large ultrathin anatase TiO2 nanosheets with nearly 100% exposed (001) facets for fast reversible lithium storage. J. Am. Chem. Soc. 132, 6124 (2010).
X. Zheng, Q. Kuang, K. Yan, Y. Qiu, J. Qiu, and S. Yang: Mesoporous TiO2 single crystals: Facile shape-, size-, and phase-controlled growth and efficient photocatalytic performance. ACS Appl. Mater. Interfaces 5, 11249 (2013).
V. Sivaram, E.J.W. Crossland, T. Leijtens, N.K. Noel, J. Alexander-Webber, P. Docampo, and H.J. Snaith: Observation of annealing-induced doping in TiO2 mesoporous single crystals for use in solid state dye sensitized solar cells. J. Phys. Chem. C 118, 1821 (2014).
C. Li, G. Chen, J. Sun, J. Rao, Z. Han, Y. Hu, and Y. Zhou: A novel mesoporous single-crystal-like Bi2WO6 with enhanced photocatalytic activity for pollutants degradation and oxygen production. ACS Appl. Mater. Interfaces 7, 25716 (2015).
C.X. Li, Z.Y. Zhao, H.S. Lomboleni, H.W. Huang, and Z.J. Peng: Enhanced visible photocatalytic activity of nitrogen doped single crystal-like TiO2 by synergistic treatment with urea and mixed nitrates. J. Mater. Res. 32, 737 (2017).
H. Yu, R. Shi, Y. Zhao, T. Bian, Y. Zhao, C. Zhou, G.I.N. Waterhouse, L. Wu, C. Tung, and T. Zhang: Alkali-assisted synthesis of nitrogen deficient graphitic carbon nitride with tunable band structures for efficient visible-light-driven hydrogen evolution. Adv. Mater. 29, 1605148–1605156 (2017).
Y. Zhao, B. Zhao, J. Liu, G. Chen, R. Gao, S. Yao, M. Li, Q. Zhang, L. Gu, J. Xie, X. Wen, L. Wu, C. Tung, D. Ma, and T. Zhang: Oxide-modified nickel photocatalysts for the production of hydrocarbons in visible light. Angew. Chem. Int. Ed. 55, 4215 (2016).
Y. Zhao, G. Chen, T. Bian, C. Zhou, G.I.N. Waterhouse, L. Wu, C. Tung, L.J. Smith, D. O’Hare, and T. Zhang: Defect-rich ultrathin znal-layered double hydroxide nanosheets for efficient photoreduction of CO2 to CO with water. Adv. Mater. 27, 7824 (2015).
L. Zheng, X. Yu, M. Long, and Q. Li: Humic acid-mediated visible-light degradation of phenol on phosphate-modified and Nafion-modified TiO2 surfaces. Chin. J. Catal. 38, 2076 (2017).
H.W. Huang, K. Xiao, Y. He, T. Zhang, F. Dong, X. Du, and Y.H. Zhang: In situ assembly of BiOI@Bi12O17Cl2 p–n junction: Charge induced unique front-lateral surfaces coupling heterostructure with high exposure of BiOI {001} active facets for robust and nonselective photocatalysis. Appl. Catal. B Environ. 199, 75 (2016).
H.W. Huang, Y. He, X. Li, M. Li, C. Zeng, F. Dong, X. Du, T. Zhang, and Y.H. Zhang: Bi2O2(OH)(NO3) as a desirable [Bi2O2](2+) layered photocatalyst: Strong intrinsic polarity, rational band structure and {001} active facets co-beneficial for robust photooxidation capability. J. Mater. Chem. A 3, 24547 (2015).
Z. Lyu, B. Liu, R. Wang, and L. Tian: Synergy of palladium species and hydrogenation for enhanced photocatalytic activity of {001} facets dominant TiO2 nanosheets. J. Mater. Res. 32, 2781 (2017).
X. Cheng, X. Yu, Z. Xing, and L. Yang: Enhanced visible light photocatalytic activity of mesoporous anatase TiO2 codoped with nitrogen and chlorine. Int. J. Photoenergy 2012, 1 (2012).
X. Wang, S. Shen, Z. Feng, and C. Li: Time-resolved photoluminescence of anatase/rutile TiO2 phase junction revealing charge separation dynamics. Chin. J. Catal. 37, 2059 (2016).
S.K. Kassahun, Z. Kiflie, D.W. Shin, S.S. Park, W.Y. Jung, and Y.R. Chung: Facile low temperature immobilization of N-doped TiO2 prepared by sol–gel method. J. Sol-Gel Sci. Technol. 83, 698 (2017).
T.C. Jagadale, S.P. Takale, R.S. Sonawane, H.M. Joshi, S.I. Patil, B.B. Kale, and S.B. Ogale: N-doped TiO2 nanoparticle based visible light photocatalyst by modified peroxide sol–gel method. J. Phys. Chem. C 112, 14595 (2008).
B. Naik, S.Y. Moon, S.H. Kim, and J.Y. Park: Enhanced photocatalytic generation of hydrogen by Pt-deposited nitrogen-doped TiO2 hierarchical nanostructures. Appl. Surf. Sci. 354, 347 (2015).
M.S. Jyothi, P.D. Souza Laveena, R. Shwetharani, and G.R. Balakrishna: Novel hydrothermal method for effective doping of N and F into nano titania for both, energy and environmental applications. Mater. Res. Bull. 74, 478 (2016).
H.W. Huang, K. Liu, K. Chen, Y.L. Zhang, Y.H. Zhang, and S.C. Wang: Ce and F comodification on the crystal structure and enhanced photocatalytic activity of Bi2WO6 photocatalyst under visible light irradiation. J. Phys. Chem. C 118, 14379 (2014).
X.G. Han, Q. Kuang, M.S. Jin, Z. Xie, and L. Zheng: Synthesis of titania nanosheets with a high percentage of exposed (001) facets and related photocatalytic properties. J. Am. Chem. Soc. 131, 3152 (2009).
Z.Y. Wang, K.L. Lv, G.H. Wang, K. Deng, and D. Tang: Study on the shape control and photocatalytic activity of high-energy anatase titania. Appl. Catal., B 100, 378 (2011).
Y. Liu, L. Tian, X. Tan, X. Li, and X. Chen: Synthesis, properties, and applications of black titanium dioxide nanomaterials. Sci. Bull. 62, 431 (2017).
F. Li, T. Han, H. Wang, X. Zheng, J. Wan, and B. Ni: Morphology evolution and visible light driven photocatalysis study of Ti3+ self-doped TiO2−x nanocrystals. J. Mater. Res. 32, 1563 (2017).
S. Shet, K. Ahn, T. Deutsch, H.L. Wang, N. Ravindra, Y.F. Yan, J. Turner, and M. Al-Jassim: Synthesis and characterization of band gap-reduced ZnO:N and ZnO:(Al,N) films for photoelectrochemical water splitting. J. Mater. Res. 25, 69 (2010).
J. Prochazka, L. Kavan, M. Zukalova, P. Janda, J. Jirkovsky, Z.V. Zivcova, A. Poruba, M. Bedu, M. Döbbelin, and R. Tena-Zaera: Dense TiO2 films grown by sol–gel dip coating on glass, F-doped SnO2, and silicon substrates. J. Mater. Res. 28, 385 (2013).
J. Wen, X. Li, W. Liu, Y. Fang, J. Xie, and Y. Xu: Photocatalysis fundamentals and surface modification of TiO2 nanomaterials. Chin. J. Catal. 36, 2049 (2015).
K.I. Ishibashi, A. Fujishima, T. Watanabe, and K. Hashimoto: Detection of active oxidative species in TiO2 photocatalysis using the fluorescence technique. Electrochem. Commun. 2, 207 (2000).
J. Zhu, S. Wang, Z. Bian, S. Xie, C. Cai, J. Wang, H. Yang, and H. Li: Solvothermally controllable synthesis of anatase TiO2 nanocrystals with dominant {001} facets and enhanced photocatalytic activity. CrystEngComm 12, 2219 (2010).
J.G. Yu, G.P. Dai, Q.J. Xiang, and M. Jaroniec: Fabrication and enhanced visible-light photocatalytic activity of carbon self-doped TiO2 sheets with exposed {001} facets. J. Mater. Chem. 21, 1049 (2011).
H.W. Huang, R.R. Cao, S. Yu, K. Xu, W. Hao, Y. Wang, F. Dong, T. Zhang, and Y.H. Zhang: Single-unit-cell layer established Bi2WO6 3D hierarchical architectures: Efficient adsorption, photocatalysis and dye-sensitized photoelectrochemical performance. Appl. Catal. B Environ. 219, 526 (2017).
H.W. Huang, K. Xiao, T. Zhang, F. Dong, and Y.H. Zhang: Rational design on 3D hierarchical bismuth oxyiodides via in situ self-template phase transformation and phase-junction construction for optimizing photocatalysis against diverse contaminants. Appl. Catal. B Environ. 203, 879 (2017).
J. Xie, L. Bian, L. Yao, Y.J. Hao, and Y. Wei: Simple fabrication of mesoporous TiO2 microspheres for photocatalytic degradation of pentachlorophenol. Mater. Lett. 91, 213 (2013).
H.W. Huang, X. Han, X. Li, S. Wang, P.K. Chu, and Y.H. Zhang: Fabrication of multiple heterojunctions with tunable visible-light-active photocatalytic reactivity in BiOBr–BiOl full-range composites based on microstructure modulation and band structures. ACS Appl. Mater. Interfaces 7, 482 (2015).
K. Selvam, S. Balachandran, R. Velmurugan, and M. Swaminathan: Mesoporous nitrogen doped nano titania—A green photocatalyst for the effective reductive cleavage of azoxy benzenes to amines or 2-phenyl indazoles in methanol. Appl. Catal., A 413, 213 (2012).
Y. Yan, T. Chen, Y. Zou, and Y. Wang: Biotemplated synthesis of Au loaded Sn-doped TiO2 hierarchical nanorods using nanocrystalline cellulose and their applications in photocatalysis. J. Mater. Res. 31, 1383 (2016).
K. Qi, B. Cheng, J. Yu, and W. Ho: A review on TiO2-based Z-scheme photocatalysts. Chin. J. Catal. 38, 1936 (2017).
C.D. Valentin, E. Finazzi, and G. Pacchioni: Density functional theory and electron paramagnetic resonance study on the effect of N-F codoping of TiO2. Chem. Mater. 20, 3706 (2008).
H.W. Huang, K. Xiao, N. Tian, F. Dong, T. Zhang, X. Du, and Y.H. Zhang: Template-free precursor-surface-etching route to porous, thin g-C3N4 nanosheets for enhancing photocatalytic reduction and oxidation activity. J. Mater. Chem. A 5, 17452 (2017).
F. Wu, X. Li, W. Liu, and S. Zhang: Highly enhanced photocatalytic degradation of methylene blue over the indirect all-solid-state Z-scheme g-C3N4–RGO–TiO2 nanoheterojunctions. Appl. Surf. Sci. 405, 60 (2017).
X. Li, T. Xia, C. Xu, J. Murowchick, and X. Chen: Synthesis and photoactivity of nanostructured CdS–TiO2 composite catalysts. Catal. Today 225, 64 (2014).
F. Wu, W. Liu, J. Qiu, J. Li, W. Zhou, Y. Fang, S. Zhang, and X. Li: Enhanced photocatalytic degradation and adsorption of methylene blue via TiO2 nanocrystals supported on graphene-like bamboo charcoal. Appl. Surf. Sci. 358, 425 (2015).
H.W. Huang, Y. He, Z. Lin, L. Kang, and Y.H. Zhang: Two novel Bi-based borate photocatalysts: Crystal structure, electronic structure, photoelectrochemical properties, and photocatalytic activity under simulated solar light irradiation. J. Phys. Chem. C 117, 22986 (2013).
H.W. Huang, S.C. Tu, C. Zeng, T. Zhang, A.H. Reshak, and Y.H. Zhang: Macroscopic polarization enhancement promoting photo- and piezoelectric-induced charge separation and molecular oxygen activation. Angew. Chem., Int. Ed. 56, 11860 (2017).
L. Tian, J. Xu, A. Alnafisah, R. Wang, X. Tan, N.A. Oyler, L. Liu, and X. Chen: A novel green TiO2 photocatalyst with a surface charge-transfer complex of Ti and hydrazine groups. Chem. Eur. J. 23, 5345 (2017).
F. Liu, X. Yan, X. Chen, L. Tian, Q. Xia, and X. Chen: Mesoporous TiO2 nanoparticles terminated with carbonate-like groups: Amorphous/crystalline structure and visible-light photocatalytic activity. Catal. Today 264, 243 (2016).
L. Liu and X. Chen: Titanium dioxide nanomaterials: Self-structural modifications. Chem. Rev. 114, 9890 (2014).
J.Y. Cheng, J. Chen, W. Lin, Y.D. Liu, and Y. Kong: Improved visible light photocatalytic activity of fluorine and nitrogen co-doped TiO2 with tunable nanoparticle size. Appl. Surf. Sci. 332, 573 (2015).
J.L. Zhang, Y.M. Wu, M.Y. Xing, S.A.K. Leghari, and S. Sajjad: Development of modified N doped TiO2 photocatalyst with metals, nonmetals and metal oxides. Energy Environ. Sci. 3, 715 (2010).
X. Li, H.L. Liu, D.L. Luo, J.T. Li, Y. Huang, H.L. Li, Y.P. Fang, Y.H. Xu, and L. Zhu: Adsorption of CO2 on heterostructure CdS (Bi2S3)/TiO2 nanotube photocatalysts and their photocatalytic activities in the reduction of CO2 to methanol under visible light irradiation. Chem. Eng. J. 180, 151 (2012).
ACKNOWLEDGMENTS
This project is financially supported by the Fundamental Research Funds for the Central Universities of China No. 2652017150, and the innovative experiment projects of China University of Geosciences (Beijing) Nos. 2017BXY033 and 2017BXY034.
Author information
Authors and Affiliations
Corresponding authors
Supplementary Material
43578_2018_33101411_MOESM1_ESM.doc
Supporting information for Molten-salt fabrication of (N, F)-codoped single-crystal-like titania with high exposure of (001) crystal facet for highly efficient degradation of Methylene Blue (MB) under visible light irradiation (approximately 710 KB)
Rights and permissions
About this article
Cite this article
Zhao, Z., Feng, M., Peng, Z. et al. Molten-salt fabrication of (N,F)-codoped single-crystal-like titania with high exposure of (001) crystal facet for highly efficient degradation of methylene blue under visible light irradiation. Journal of Materials Research 33, 1411–1421 (2018). https://doi.org/10.1557/jmr.2018.106
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/jmr.2018.106