Construction of Oxygen Vacancy Defects of γ-Al2O3 and Application of UV-Vis Spectrophotometry in Its Performance Detection
1. Environmental Catalysis and Clean Technology Research and Innovation Center, Shijiazhuang Key Laboratory of Low Carbon Energy Materials, School of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, China
2. Shijiazhuang Ke Jia Architectural Engineering Technology co., ltd, Shijiazhuang 050035, China
| 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. |
| Keywords: | Melamine; OV-γ-Al2O3; UV-Vis Spectrophotometry; Methylene Blue; Degradation |
| DOI: | 10.57237/j.mater.2024.05.001 |
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Received: 14 July 2024
Accepted: 28 August 2024
Published Online: 9 September 2024
Funding
| 1. | 石家庄学院2024年大学生创新创业训练计划项目 (SCXM0062) |
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