Construction of Oxygen Vacancy Defects of γ-Al2O3 and Application of UV-Vis Spectrophotometry in Its Performance Detection
Year: 2024
Type: article
Abstract: In this paper, the precursor of γ-Al2O3 was prepared by hydrothermal method, AlOOH (pseudo-thin aluminium water), further mixed with melamine, calcined into oxygen-deficient γ-Al2O3 (OV-γ-Al2O3) by one-step pyrolysis method in an air atmosphere, and the morphology and structure of the samples were characterized by a series of characterization methods such as SEM and XRD. Ultraviolet-Vis spectrophotometry was used to determine the degradation efficiency of the catalyst to methylene blue. By controlling the annealing rate of melamine (CM) and g-C3N4(CN) after calcination of γ-Al2O3 precursors, the products of melamine thermal decomposition were investigated to form g-C3N4 or oxygen vacancies formed by γ-Al2O3. The results show that when the annealing rate is 5°C/min, g-C3N4 is formed, and when the annealing rate is 1°C/min, g-C3N4 decomposes to construct the oxygen vacancy of the carrier. When the doping ratio is 1.2:1, the total degradation effect of OV-γ-Al2O3 can reach 89%, which is 2.8 times that of ordinary Al2O3 and 1 times higher than that of γ-Al2O3. The stability of OV-γ-Al2O3 was proved by five cycle experiments and the degradation of different concentrations of MB solution, and the data were analyzed and discussed, in order to provide a theoretical basis and research ideas for the treatment of actual sewage. Finally, combined with various characterization and test results, the main active species of OV-γ-Al2O3 in the degradation process were predicted •OH.
Institution: Shijiazhuang University
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4402425192