[39] S. Mukhopadhyay, P.P. Das, S. Maity, P. Ghosh, P.S. Devi, Solution grown ZnO rods: synthesis, characterization and defect mediated photocatalytic activity,Appl. Catal. B 165 (2015) 128–138.

[40] S. Girish Kumar, K.S.R. Koteswara Rao, Zinc oxide based photocatalysis:tailoring surface-bulk structure and related interfacial charge carrier dynamics for better environmental applications, RSC Adv. 5 (2015)3306–3351.

[41] Y.X. Wang, Y.Q. Yang, L.M. Xi, X.D. Zhang, M.H. Jia, H.M. Xu, H.G. Wu, A simple hydrothermal synthesis of flower-like ZnO microspheres and their improvedphotocatalytic activity, Mater. Lett. 180 (2016) 55–58.

[42] K. Hou, Z.W. Gao, M. Da, Z.M. Li, H.M. Sun, J.L. Li, Y.H. Xie, T.Y. Kang, A. Mijit,Oriented growth of urchin-like zinc oxide micro/nano-scale structures in aqueous solution, Mater. Res. Bull. 47 (2012) 1010–1015.

[43] F. Xu, Y.T. Shen, L.T. Sun, H.B. Zeng, Y.N. Lu, Enhanced photocatalytic activity of hierarchical ZnO nanoplate-nanowire architecture as environmentally safe and facilely recyclable photocatalyst, Nanoscale 3 (2011) 5020–5025.

[44] A. Umar, M.S. Akhtar, A. Al-Hajry, M.S. Al-Assiri, G.N. Dar, M. Saif Islam,Enhanced photocatalytic degradation of harmful dye and phenyl hydrazine chemical sensing using ZnO nanourchins, Chem. Eng. J. 262 (2015) 588–596.