**Author details**

Izunna Stanislaus Okeke1,2\*, Priscilla Yahemba Aondona1 , Amoge Chidinma Ogu1 , Eugene Echeweozo<sup>3</sup> and Fabian Ifeanyichukwu Ezema1,4,5

1 Faculty of Physical Sciences, Department of Physics and Astronomy, University of Nigeria Nsukka, Nigeria

2 National Biotechnology Development Agency, FCT Abuja, Nigeria

3 Department of Physics with Electronics, Evangel University Akaeze, Akaeze, Ebonyi State, Nigeria

4 Nanosciences African Network (NANOAFNET), iThemba LABS-National Research, Western Cape Province, South Africa

5 UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa

\*Address all correspondence to: okekestannie@gmail.com

© 2022 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

*Role of Surface Defects and Optical Band-gap Energy on Photocatalytic Activities… DOI: http://dx.doi.org/10.5772/intechopen.106253*
