Novel CuO–SiO2 nanocomposites: synthesis, kinetics, recyclability, high stability and photocatalytic efficiency for Rose Bengal dye removal

• Published in: Transition metal chemistry (Weinheim) Vol. 49; no. 3; pp. 195 - 213
• Main Authors: Gharbi, Ahlam Hacine, Hemmami, Hadia, Laouini, Salah Eddine, Bouafia, Abderrhmane, Ben Amor, Ilham, Zeghoud, Soumeia, Gherbi, Mohammed Taher, Ben Amor, Asma, Alharthi, Fahad, Abdullah, Johar Amin Ahmed
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 2024; Springer Nature B.V
• Subjects: Catalysis; Catalytic activity; Chemistry; Chemistry and Materials Science; Copper oxides; Dyes; Inorganic Chemistry; Light irradiation; Nanocomposites; Nanoparticles; Organometallic Chemistry; Photocatalysis; Photodegradation; Physical Chemistry; Recyclability; Silicon dioxide; Synthesis
• ISSN: 0340-4285; 1572-901X
• DOI: 10.1007/s11243-024-00574-x

A novel CuO–SiO 2 nanoadsorbent, incorporating copper oxide (CuO) and silicon dioxide (SiO 2 ), has been successfully synthesized using three distinct preparation processes: Mode-A (solution and solution), Mode-B (solution and nanoparticles), and Mode-C (nanoparticles and nanoparticles). The investigation focuses on evaluating the efficiency of the CuO–SiO 2 nanoadsorbent, considering its synthesis process, reusability, and sustained performance over time, particularly in the removal of Rose Bengal dye. Characterization results revealed the formation of CuO–SiO 2 nanocomposites structure irregular shapes morphology across all three-preparation processes. The average particle sizes for Mode-A, Mode-B, and Mode-C nanocomposites were determined as 18.1 nm, 15.6 nm, and 14.8 nm, respectively. Furthermore, the band gap energies of the CuO–SiO 2 nanocomposites were measured at 2.2 eV, 1.8 eV, and 3.29 eV for Mode-A, Mode-B, and Mode-C, respectively. Remarkably, the CuO–SiO 2 nanocomposite prepared using Mode-B demonstrated superior photocatalytic activity in degrading the anionic dye Rose Bengal, achieving a degradation coefficient of 84.8%. In comparison, CuO NPs, tested under the same experimental conditions (120 min contact time, pH = 7, temperature of 25 °C, and solar light irradiation), achieved a degradation coefficient of 78.8%. These findings highlight the potential of the CuO–SiO 2 nanoadsorbent, particularly when synthesized via Mode-B, for effective and environmentally friendly dye degradation applications.