List of Articles Suherman Suherman Article 1 - Doping TiO2 by Cr from tannery wastewater for improving its activity under visible light in the dye degradation 10.30495/ijc.2023.1973955.1980 Endang Wahyuni Sri Wahyuni Mandrea Nora Novianti Lestari Suherman Suherman Iranian Journal of Catalysis , Issue 2 , Year , Spring 2023