| Abstrakt: |
This study examines at the synthesis of pristine TiO2 nanoparticles, cobalt (Co)-doped TiO2, and activated biocarbon (ABC)-Co-doped TiO2 using the green precipitation technique. ABC developed from lotus stems and was precipitated with lotus leaf extract. The products were the subject of extensive structural, optical, and morphological investigations of FT-IR, XRD, FE-SEM, EDX, HR-TEM, UV-DRS, PL, and XPS studies used to characterize the photocatalysts. XRD analysis demonstrated the presence of a tetragonal phase in the TiO2 nanoparticles. The existence of certain chemical bonds was demonstrated by the FT-IR study results. The spherical morphologies seen in the FE-SEM image were composed of aggregated, randomly distributed particles; the average size ranges of TiO2, Co-TiO2, and ABC-Co-TiO2 are 36.94, 23.23, and 21.85 nm. The band gap energies of TiO2, Co-TiO2, and ABC-Co-TiO2 are 3.08, 2.53, and 1.51 eV, respectively, which suggests that the nanocomposites have higher efficiency. Furthermore, the visible-light-driven photocatalytic efficacy of the samples was evaluated using BB dye as a model contaminant. It was discovered that the ABC-Co-TiO2 photocatalyst had a higher degradation rate constant (k) than Co-TiO2 and pristine TiO2. The spherical form of the ABC-Co TiO2 sample, which is similar to a lotus leaf, enhanced visible light absorption and decreased charge carrier recombination, leading to exceptional photocatalytic activity. This was made possible by the synergistic actions of the ABC and Co metal dopants. The effective charge separation of electrons and holes has been credited with the increased photocatalytic activity. The main active species, according to the mechanistic studies, are O2, h+, and •OH. A potential mechanism for the breakdown of BB dye is also suggested. The UV light irradiation response of BB dye was studied for virgin TiO2, Co-doped TiO2, and ABC-Co-doped TiO2 catalysts. After 140 min of irradiation, the photodegradation capacity of the pristine TiO2, Co-doped TiO2, and ABC-Co-doped TiO2 catalysts increased to 60.53%, 74.43%, and 92.16%, respectively. The study also confidently investigated the antibacterial effects of the samples on six bacterial species, revealing that the ABC-Co-doped TiO2 nanocomposite had the most enhanced inhibitory effects against gram-positive and gram-negative bacteria. These findings demonstrate the great potential of these nanocomposites in various practical applications. Consequently, using medical dressing materials with ABC-Co-TiO2 nanoparticles in them helps to promote early wound healing by preventing microbial contamination. [ABSTRACT FROM AUTHOR] |
Full text from SpringerLink