γ-Al2O3的氧空位缺陷构建及紫外-可见分光光度法在其性能检测中的应用
1. 石家庄学院, 化工学院, 石家庄市低碳能源材料重点实验室, 环境催化及清洁技术研究创新中心, 河北石家庄 050035
2. 石家庄科佳建筑工程技术有限公司, 河北石家庄 050035
| 摘 要： | 本文利用水热法制备γ-Al2O3的前驱体AlOOH（拟薄水铝），与三聚氰胺进一步混合，在空气氛围下，用一步热解法煅烧成氧缺陷型γ-Al2O3（OV-γ-Al2O3），通过SEM、XRD等一系列表征手段对样品进行了形貌和结构的表征。采用紫外-可见分光光度法对催化剂降解亚甲基蓝的效率进行了测定。通过控制三聚氰胺（CM）、g-C3N4（CN）分别负载γ-Al2O3前驱体煅烧后的退火速度，探究三聚氰胺受热分解的产物是生成g-C3N4还是作用于γ-Al2O3生成氧空位。结果表明：当退火速度为5°C/min时起生成g-C3N4的作用，当退火速度为1°C/min时生成的g-C3N4分解起构建载体氧空位的作用。掺杂比为1.2:1时的OV-γ-Al2O3总降解效果最好可达89%，是普通Al2O3的2.8倍，比γ-Al2O3高1倍。通过进行5次循环实验与降解不同浓度的MB溶液，并对数据进行分析讨论，证明了OV-γ-Al2O3的稳定性并且为处理实际污水提供理论基础及研究思路。在最后结合各类表征与测试结果预测了OV-γ-Al2O3的在降解过程中的主要活性物种为•OH。 |
| 关 键 词： | 三聚氰胺; OV-γ-Al2O3; 紫外-可见分光光度法; 亚甲基蓝; 降解 |
| DOI： | 10.57237/j.mater.2024.05.001 |
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收稿日期: 2024-07-14
接受日期: 2024-08-28
在线出版日期: 2024-09-09
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 |
基金
| 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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