References

1. Y. Cong, J. Zhang, F. Chen, M. Anpo, Synthesis and characterization of nitrogen-doped TiO₂ nanophotocatalyst with high visible light activity, J. Phys. Chem., 111 (2007) 6976–6982.
2. M. Ghorbanpour, M. Yousofi, S. Lotfiman, Photo catalytic decolorization of methyl orange by silica-supported TiO₂ composites, J. Ultrafine Grained Nanostruct. Mater., 50 (2017) 43–50.
3. Z. Chen, C. Lu, Humidity sensors: a review of materials and mechanisms, Sensor Let., 3 (2005) 274–295.
4. S.G. Kumar, L.G. Devi, Review on modified TiO₂ photocatalysis under UV/visible light: selected results and related mechanisms on inter facial charge carrier transfer dynamics, J. Phys. Chem., 115 (2011) 13211–13241.
5. G. Colon, M. Maicu, M.S. Hidalgo, J.A. Navio, Cu-doped TiO₂ systems with improved photo catalytic activity, Appl. Catal. B., 67 (2006) 41–51.
6. I. Ganesh, P.P. Kumar, I. Annapoorna, J.M. Sumliner, M. Ramakrishna, N.Y. Hebalkar, G. Padmanabham, G. Sundararajan, Preparation and characterization of Cu-doped TiO₂ materials for electrochemical, photoelectrochemical, and photocatalytic applications, Appl. Surf. Sci., 293 (2014) 229–247.
7. H. Arami, M. Mazloumi, R. Khalifehzadeh, S.K. Sadrnezhaad, Sonochemical preparation of TiO₂ nanoparticles, Mater. Lett., 61 (2007) 4559–4561.
8. X.J. Yang, W.A. Shu, H.M. Sun, X.B. Wang, J.S. Lian, Preparation and photocatalytic performance of Cu-doped TiO₂ nanoparticles, Trans. Nonferrous Met. Soc. China, 25 (2015) 504–509.
9. X.H. Xia, Y. Gao, Z. Wang, Z.J. Jia, Structure and photocatalytic properties of copper-doped rutile TiO₂ prepared by a low-temperature process. J. Phys. Chem. Solids, 69 (2008) 2888–2893.
10. M. Ghorbanpour, S. Lotfiman, Solid-state immobilisation of titanium dioxide nanoparticles onto nanoclay, Micro Nano Lett., 11 (2016) 684–687.
11. S. Lotfiman, M. Ghorbanpour, Antimicrobial activity of ZnO/silica gel nanocomposites prepared by a simple and fast solid-state method. Surf. Coat. Technol., 310 (2017) 129–133.
12. R. Payami, M. Ghorbanpour, A.P. Jadid, Antibacterial silver-doped bioactive silica gel production using molten salt method, J. Nanostruct. Chem., 6 (2016) 215–221.
13. M. Ghorbanpour, M. Moghimi, S. Lotfiman, Silica-supported copper oxide nanoleaf with antimicrobial activity against Escherichia coli, J. Water Environ. Nanotechnol., 2 (2017) 112–117.
14. A. Zaleska, Doped-TiO₂: a review. Recent Patents Eng., 2 (2008) 157–164.
15. T. Luttrell, S. Halpegamage, J. Tao, A. Kramer, E. Sutter, M. Batzill, Why is anatase a better photo catalyst than rutile? Model studies on epitaxial TiO₂ films, Sci. Rep., 4 (2014) 1–8.
16. M.A. Behnajady, H. Taba, N. Modirshahla, M. Shokri, Photocatalytic activity of Cu doped TiO₂ nanoparticles and comparison of two main doping procedures, Micro Nano Lett., 8 (2013) 345–348.
17. P. Dhiman, M. Naushad, K.M. Batoo, A. Kumar, G. Sharma, A.A. Ghfar, G. Kumar, M. Singh, Nano Fe_xZn−O_x as a tuneable and efficient photo catalyst for solar powered degradation of bisphenol A from aqueous environment, J. Clean. Prod., 165 (2017) 1542–1556.
18. D. Bu, H. Zhuang, Synthesis, characterization, and photocatalytic studies of copper-doped TiO₂ hollow spheres using rape pollen as a novel biotemplate, Catal. Commun., 29 (2012) 24–28.
19. M. Hamadanian, S. Karimzadeh, V. Jabbari, D. Villagrán, Synthesis of cysteine, cobalt and copper-doped TiO₂ nano photocatalysts with excellent visible-light-induced photo catalytic activity, Mater. Sci. Semicond. Process., 41 (2016) 168–176.