Photodegradation of tartrazine dye favored by natural sunlight on pure and (Ce, Ag) co-doped ZnO catalysts oleh Tayeb Bouarroudj, Lamine Aoudjit, Lerari Djahida, Beddiaf Zaidi, Maamar Ouraghi, Djamila Zioui, Sarah Mahidine, Chander Shekhar, Khaldoun Bachari