Open Access Open Access  Restricted Access Subscription Access

Synthesis of Ag-TiO2 nanomaterial for treatment of organic pollutants under visible light

Nguyen Thi Dieu Cam, Mai Hung Thanh Tung


In this study, the sol-gel synthesis method was employed for the preparation of silver-doped TiO2 nanomaterial from potassium fluorotitanate and silver nitrate. The silver can be incorporated by direct calcination of the sol-gel material decomposing silver nitrate to silver. The visible light absorption ability of Ag- TiO2 nanoparticles was investigated by means of UV-Vis measurement. Based on the UV-Vis spectra, the absorption in the visible light of the Ag-TiO2 was found to be improved and was shifted to longer wavelength. The XPS spectra indicated that the elements detected were titanium, oxygen, and silver. Titanium and oxygen presented as Ti4+ and O2 and silver Ag existed in Ag (0) form. It is attributed to the fact that the silver is homogeneously dispersed throughout the material. The experimental results showed that the photocatalytic efficiency of Ag-TiO2 was better than prepared TiO2 under the same conditions for the photodegradation of methylene blue.

Keywords. Potassium fluorotitanate, titanium dioxide, silver, photocatalysis, visible light.


Potassium fluorotitanate, titanium dioxide, silver, photocatalysis, visible light


Z. Xiong, H. Wang, N. Xu, H. Li, B. Fang, Y. Zhao, J. Zhang, C. Zheng. Photocatalytic reduction of CO2 on Pt2+-Pt0/TiO2 nanoparticles under UV/Vis light irradiation: A combination of Pt2+ doping and Pt nanoparticles deposition, International Journal of Hydrogen Energy, 40, 10049-10062 (2015).

A. V. Rosario, E. C. Pereira. The role of Pt addition on the photocatalytic activity of TiO2 nanoparticles: The limit between doping and metallization, Applied Catalysis B: Environmental, 144, 840-845 (2014).

C. X. Sun, Y. Wang, A. P. Jia, S.X. Chen, M. F. Luo, J. Q. Lu. Gas-phase epoxidation of 3,3,3-trifluoropropylene over Au/Cu-TiO2 catalysts with N2O as the oxidant, Journal of Catalysis, 312, 139-151 (2014).

L. Lin, W. Lin, Y. Zhu, B. Zhao, Y. Xie. Phosphor-doped titania - A novel photocatalyst active in visible light, Chemistry Letters, 34, 284-285 (2005).

R. Jaiswal, J. Bharambe, N. Patel, A. Dashora, D.C. Kothari, A. Miotello. Copper and Nitrogen co-doped TiO2 photocatalyst with enhanced optical absorption and catalytic activity, Applied Catalysis B: Environmental, 168-169, 333-341 (2015).

T. Liu, B. Liu, J. Wang, L. Yang, X. Ma, H. Li, Y. Zhang, S. Yin, T. Sato,T. Sekino, and Y. Wang. Smart window coating based on F-TiO2-KxWO3 nanocomposites with heat shielding, ultraviolet isolating, hydrophilic and photocatalytic performance, Sci. Rep., 6, 27373 - 27382 (2016).

T. Ohno, M. Akiyoshi, T. Umebayashi, K. Asai, T. Mitsui, and M. Matsumura. Preparation of S-doped TiO2 photocatalysts and their photocatalytic activities under visible light, Applied Catalysis A, 1(265), 115-121 (2004).

T. Tachikawa, S. Tojo, K. Kawai, Masayuki Endo, Mamoru Fujitsuka, Teruhisa Ohno, Kazumoto Nishijima, Zenta Miyamoto and Tetsuro Majima. Photocatalytic oxidation reactivity of holes in the sulphur-and carbon-doped TiO2 powders studied by time-resolved diffuse reflectance spectroscopy, Journal of Physical Chemistry B, 50(108), 19299-19306, (2004).

X. Chen. S.S. Mao. Titanium dioxide nanomaterials synthesis, properties, modifications and applications, Chemical Reviews, 107, 2891-2959 (2007).

P.N. Paulino, V.M.M. Salim, N.S. Resende. Zn-Cu promoted TiO2 photocatalyst for CO2 reduction with H2O under UV light, Applied Catalysis B: Environmental, 185, 362-370 (2016).

R. Jaiswal, N. Patel, A. Dashora, R. Fernandes, M. Yadav, R. Edla, R. S. Varma, D. C. Kothari, B. L. Ahuja, A. Miotello. Efficient Co-B-codoped TiO2 photocatalyst for degradation of organic water pollutant under visible light, Applied Catalysis B: Environmental, 183, 242-253 (2016).

M. M. Mohamed, M. S. Al-Sharif. Visible light assisted reduction of 4-nitrophenol to 4-aminophenol on Ag/TiO2 photocatalysts synthesized by hybrid templates, Applied Catalysis B: Environmental, 142-143, 432-441 (2013).

X. Hu, Q. Zhu, X. Wang, N. Kawazoe, Y. Yang, Nonmetal-metal-semiconductor-promoted P/Ag/Ag2O/Ag3PO4/TiO2 photocatalyst with superior photocatalytic activity and stability, Journal of Materials Chemistry A, 3, 17858-17865 (2015).

T. Whang, H. Huang, M. Hseih, J. Chen. Laser induced silver nanoparticles on Titanium dioxide for photocatalytic degradation of methylene blue, International Journal of Molecular Sciences, 10, 4707 - 4718, (2009).

H. Wang, H. Lin, C. Kuo, Y. Cheng, Y. Yeh. Synthesis and photocatalysis of mesoporous anatase TiO2 powders incorporated Ag nanoparticles, Journal of Physics and Chemistry of Solids, 69, 633-636 (2008).

Binyu Yu, Kar Man Leung, Qiuquan Guo, Woon Ming Lau and Jun Yang. Synthesis of Ag-TiO2 composite nano thin film for antimicrobial application, Nanotechnology, 22, 115603-115612 (2011).

P. Falaras, I. M. Arabatzis, T. Stergioulos, M. C. Bernard. Enhanced activity of silver modified thin-film TiO2 photocatalysts, International Journal of Photoenergy, 5, 123-130 (2003).

J. Panpranot, K. Kontapakdee, P. Praserthdam. Effect of TiO2 crystalline phase composition on the physicochemical and catalytic properties of Pd/TiO2 in selective acetylene hydrogenation, Journal of Physical Chemistry B, 110, 8019-8024 (2006).

Full Text: PDF


  • There are currently no refbacks.