Synthèse, Caractérisation et Propriétés Photocatalytiques et Biologiques des Oxydes Mixtes à Base des Métaux divalents et trivalents.

BOUCHAL, Wissam (2024) Synthèse, Caractérisation et Propriétés Photocatalytiques et Biologiques des Oxydes Mixtes à Base des Métaux divalents et trivalents. Doctoral thesis, Université Mohamed Khider (Biskra - Algérie).

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Abstract

The water pollution is one of the major problems threatening the planet due to rapid industrial development, and the search for effective, economical, and environmentally friendly solutions has become a challenge for scientists, which is the main objective of this study. Rhodamine B, a difficult-to-degrade dye that causes harmful effects such as cancer and inflammation of the respiratory tract, is the subject of study by many scientists. In the aim to eliminate it from wastewater, Bi%-BaBiO3 powder (0%, 5%, 10%, 10%, 15%, and 20%) was synthesized using the sol-gel technique, where an excess of Bismuth nitrate was added to determine its effect, to verify its photocatalytic activity on one hand, and to study its biological properties as an antioxidant and antibacterial agent on the other hand, to create a compound,with multiple properties. X-ray results indicated the formation of a binary compound BaBiO3-,BaCO3. In photocatalytic tests, a high photocatalytic,activity of 73% was observed for the degradation of RhB under sunlight, and it was recycled for other cycles. In the study of,nantibacterial and antioxidant activity, the addition of an excess of bismuth nitrate enhanced the,antibacterial activity against Gram-positive and Gram-negative microorganisms such as S. aureus and E. coli, while 10% of Bi-BBO as an antioxidant agent had the most effective IC50n,bvalue of 2.5 mg/ml. In the second part of the study Bi4O7-Bi2O3 was synthesized using the solgel technique and treated at 500°C to study itsnphotocatalytic properties under visible light sunlight and artificial light (LED 16 W), and then its antioxidant properties. X-ray results showed that the binary composite Bi4O7-Bi2O3 was formed under tetragonal and triclinic structures respectively. The photocatalytic results were impressive, with degradation rates ofb Rhodamine B of 94.41% under sunlight for 120 minutes, and 83.10% under artificial light for 180 minutes, with a wavelength shift indicating progressive demethylation of Rhodamine B.

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