Ba0.5Sr0.5TiO3/BaFe12O19 magnetic separation photocatalysts: Structural, optical, microstructure, photocatalytic activity, degradation pathway and mechanism
Ba0.5Sr0.5TiO3/BaFe12O19 magnetic separation photocatalysts: Structural, optical, microstructure, photocatalytic activity, degradation pathway and mechanism
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DOI：
10.1016/j.ceramint.2023.09.126
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发表时间：
2023-09
影响因子：
5.2
通讯作者：
Yan Han;Shifa Wang;Xinmiao Yu;Maoyuan Li;Z. Yi;Jinlong Tang;Huajing Gao;Han Yang;
中科院分区：
文献类型：
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作者：
Yan Han;Shifa Wang;Xinmiao Yu;Maoyuan Li;Z. Yi;Jinlong Tang;Huajing Gao;Han Yang;
采用聚丙烯酰胺凝胶法制备了Ba0.5Sr0.5TiO3/BaFe12O19(BST5/BFO)磁性光催化剂。考察了不同BFO含量对BST5/BFO磁性光催化剂的物相、表面结构、磁性和光学性质以及光催化效率的影响。考察了BST5、BFO和BST5/BFO磁性光催化剂在模拟太阳光照射、pH=5、催化剂用量为1 g/L、催化剂初始浓度为50 mg/L的条件下对四环素盐酸盐(TC)的光催化降解性能，其光催化效率变化趋势为：原始BFO；原始BST5；BST5/20%BFO；BST5/15%BFO；BST5/5%BFO；BST5/10%BFO。BST5/BFO磁性光催化剂光催化效率的提高主要归因于光吸收系数、方形比(SQR)、界面电荷转移和分离效率的协同作用，这是由于杂质缺陷和磁场导致氧空位、空穴、羟基自由基和超氧自由基的形成。通过第一性原理计算、捕获实验、自由基验证实验、磁性数据和液-质联用实验，详细阐述了BST5/BFO磁性光催化剂的合理光催化机理和可能的中间产物。
The Ba0.5Sr0.5TiO3/BaFe12O19(BST5/BFO) magnetic photocatalysts were constructed by a polyacrylamide gel route combined with low temperature heat treatment process. The effect of different BFO contents on the phase, surface microstructure, magnetic and optical properties, and photocatalytic efficiency of BST5/BFO magnetic photocatalysts was investigated. The BST5, BFO and BST5/BFO magnetic photocatalysts were evaluated for the degradation of tetracycline hydrochloride (TC) under simulated sunlight irradiation for 120 min, pH=5, catalyst content of 1 g/L, initial TC concentration of 50 mg/L and the photocatalytic efficiency trend followed the order: pristine BFO < pristine BST5 < BST5/20%BFO < BST5/15%BFO < BST5/5%BFO <BST5/10%BFO. The improvement of photocatalytic efficiency of BST5/BFO magnetic photocatalyst is mainly attributed to the synergistic effect of optical absorption coefficient, squareness ratio (SQR), interface charge transfer and separation efficiency due to the impurity defect and magnetic field induced the formation of oxygen vacancy, hole, hydroxyl radical and superoxide radical. The reasonable photocatalytic mechanism of BST5/BFO magnetic photocatalysts and possible intermediate products were elucidated in detail on the basis of the first principles calculation, capture experiment, radical verification experiment, magnetic data and liquid chromatography-mass spectrometry.