فهرس المقالات Congo red dye حرية الوصول المقاله صفحة الملخص نص كامل 1 - Doping TiO2 by Cr from tannery wastewater for improving its activity under visible light in the dye degradation Endang Wahyuni Sri Wahyuni Mandrea Nora Novianti Lestari Suherman Suherman 10.30495/ijc.2023.1973955.1980