Hydrothermal Synthesis of Bi₄Ti₃O₁₂/TiO₂ Composite

Abstract:

A hydrothermal processing technology was employed to synthesize Bi₄Ti₃O₁₂/TiO₂ composite by using TiO₂ and Bi(NO₃)₃ as reactor precursors, and KOH as mineralizer. The microstructure and composition of the as-synthesized samples were characterized by X-ray diffraction (XRD), scan electron microscopy (SEM), and the photocatalytic activity was studied. The results showed that Bi/Ti molar ratio, mass of the KOH and the hydrothermal parameters play important roles on the morphology and activities of the photocatalyst. We could obtain composites with good morphology and better performance with 200 °C hydrothermal treatment for 12 h, 0.01 mol/L of KOH, and 1:2 of mole ratio of Bi/Ti, as well as using good crystalline TiO₂ as the raw material. The as-prepared powder has a diameter of about 800nm, and the decolorized rate of methylene blue could reach 95 % after the UV-irradiation for 5 h.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 109-112
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.109
• Online since: July 2016
• Authors: Wei Zhao*, Nian Qi Liu, Hong Xing Wang, Yu Bo Zhang, Shi Meng Zhang, Ke Xin Gao, Xu Chen, Zhi Yun Fan
• Keywords: Bi₄Ti₃O₁₂/TiO₂, Hydrothermal, Methylene Blue, Photocatalyst

References

[1] E. Evgenidou, K. Fytianos, I. Poulios, Semiconductor-sensitized photodegradation of dichlorvos in water using TiO2 and ZnO as catalysts, Appl. Catal. B: Environ. 59 (2005) 81-89.

DOI: 10.1016/j.apcatb.2005.01.005

[2] J.S. Lee, K.H. You, C.B. Park. Highly photoactive, low band gap TiO2 nanoparticles wrapped by graphene, Adv. Mater. 24 (2012) 1084-1088.

DOI: 10.1002/adma.201104110

[3] H. Choi, E. Stathatos, D.D. Dionysiou, Sol–gel preparation of mesoporous photocatalytic TiO2 films and TiO2/Al2O3 composite membranes for environmental applications, Appl. Catal. B: Environ. 63 (2006) 60-67.

DOI: 10.1016/j.apcatb.2005.09.012

[4] J.S. Dalton, P.A. Janes, N.G. Jones, J.A. Nicholson, K.R. Hallam, G.C. Allen, Photocatalytic oxidation of NOx gases using TiO2: a surface spectroscopic approach, Environ. Pollut. 120 (2002) 415-422.

DOI: 10.1016/s0269-7491(02)00107-0

[5] Y.Y. Yao, C.H. Song, P. Bao, D. Su, X.M. Lu, J.S. Zhu Y.N. Wang, Doping effect on the dielectric property in bismuth titanate, J. Appl. Phys. 95 (2004) 3126-3130.

DOI: 10.1063/1.1649456

[6] Z.H. Zhao, J. Tian, D. Wang, X.L. Kang, Y.H. Sang, H, Liu, J.Y. Wang, S.W. Chen, R.I. Boughtond, H.D. Jiang, UV-visible-light-activated photocatalysts based on Bi2O3/Bi4Ti3O12/TiO2 double-heterostructured TiO2 nanobelts, J. Mater. Chem. 22 (2012).

DOI: 10.1039/c2jm34580c

[7] K.H. Xue, L.R.C. Fonseca, Y. Nishi, First-principles study of A-site substitution in ferroelectric bismuth titanate, J. Mater. Sci. 49 (2014) 6363-6372.

DOI: 10.1007/s10853-014-8363-4

[8] Y. Li, L.Y. Dang, L.F. Han, P.P. Li, J.S. Wang, Z.J. Li, Iodine-sensitized Bi4Ti3O12/TiO2 photocatalyst with enhanced photocatalytic activity on degradation of phenol, J. Mol. Catal. A: Chem. 379 (2013) 146-151.

DOI: 10.1016/j.molcata.2013.08.001

[9] T. Cao, Y. Li, C.H. Wang, Z.Y. Zhang, M.Y. Zhang, C.L. Shao, Y.C. Liu, Bi4Ti3O12 nanosheets/TiO2 submicron fibers heterostructures: in situ fabrication and high visible light photocatalytic activity, J. Mater. Chem. 21 (2011) 6922-6927.

DOI: 10.1039/c1jm10343a

[10] K.M.S. Khalil, A.A. Elsamahy, M.S. Elanany, Formation and characterization of high surface area thermally stabilized Titania/Silica composite materials via hydrolysis of titanium(IV) tetra-Isopropoxide in sols of spherical silica particles, J. Colloid Interface Sci. 249 (2002).

DOI: 10.1006/jcis.2002.8268

[11] W. Wang, P. Serp, P. Kalck, L.F. Joaquim, Photocatalytic degradation of phenol on MWNT and titania composite catalysts prepared by a modified sol-gel method, Appl. Catal. B: Environ. 56 (2005) 305-312.

DOI: 10.1016/j.apcatb.2004.09.018