1. UNIVERSITY OF ABDELHAMID IBN BADIS – MOSTAGANEM FACULTY OF SCIENCE 1 Option : Process Engineering By Miss BENYAMINA Imane, Miss B. BENALIOUA, Mr A. BENTOUAMI July 2015 A poster presented at the 17th International Conference on Chemical and Biological Engineering Bismuth doped ZnO for Photo- Catalytic discoloration Efficiency of Indigo Carmine Under Visible Light

2. 2 Heterogeneous photocatalysis one of advanced oxidation processes, it is used in the field of water pollution. Its principle is based on the excitation of a semi-conductor by ultraviolet radiation.

3. 3 Material and Method Solution A Solution B Solution C White suspension vigorous stirringDrying White Powder Bi-ZnO washed Filtration Calcination at 550°C Yellow Powder

4. 4 Results and discussion 1. CHARACTERIZATION OF PREPARED MATERIALS 1- XRD 2- UV-visible DRS

5. Kinetics Study of Photodegradation Indigo carmine at different concentrations in the presence of ZnO and Bi-ZnO. 5 Photo-catalytic degradation kinetics of indigo carmine by ZnO and Bi-ZnO at different concentrations (a), canning Indigo Carmine 20 mg / L after photodegradation in the presence of ZnO and (Bi-ZnO) 550 °C 1 g / L under the irradiation of visible light (b). (a) (b)

6. 6  The efficiency of visible light in the degradation of indigo carmine.  The total discoloration of indigo carmine at 20 mg/L was obtained after 70 and 120 min in the presence of Bi-ZnO and ZnO 40 min with Bi-ZnO 120 min with ZnO