R. Mugumo, E.O. Ichipi, S.M. Tichapondwa, E.M.N. Chirwa, Bandgap Tailoring of ZnO Using Metallic Sulphides for Enhanced Visible-light-active Photocatalytic Water Treatment, Chemical Engineering Transactions. 103 (2023) 829-834. doi:10.3303/CET23103139.