Constructing Z-scheme β-Bi2O3/ZrO2 heterojunctions with 3D mesoporous SiO2 nanospheres for efficient antibiotic remediation via synergistic adsorption and photocatalysis
Constructing Z-scheme β-Bi2O3/ZrO2 heterojunctions with 3D mesoporous SiO2 nanospheres for efficient antibiotic remediation via synergistic adsorption and photocatalysis
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DOI：
10.1007/s12598-021-01897-9
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发表时间：
2022-01
期刊：
影响因子：
8.8
通讯作者：
Chongfu Xu;Qin Zhou;Weiya Huang;Kai Yang;Yongcai Zhang;T. Liang;Zhao‐Qing Liu
中科院分区：
文献类型：
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作者：
Chongfu Xu;Qin Zhou;Weiya Huang;Kai Yang;Yongcai Zhang;T. Liang;Zhao‐Qing Liu
合成了一系列含有三维（3D）介孔二氧化硅纳米球（MSN）的Z型β-Bi2O3/ZrO2异质结复合材料，作为抗生素修复的有效催化剂。所得的MSN/β-Bi2O3/ZrO2三元复合材料具有新颖的层状交叉结构，该结构由β-Bi2O3纳米片、3D MSNs和ZrO2纳米颗粒良好构建。最佳样品 BZS-2（Bi:Zr:Si = 1:0.4:0.33）在模拟太阳光照射 100 分钟下，对左氧氟沙星 (LVF) 的吸附光催化去除效率为 92.7%，总有机碳 (TOC) 去除效率为 60.0%。 BZS-2还可以分别去除90.1%和91.2%的盐酸四环素（TC）和盐酸土霉素（OTC），并且BZS-2对TC的最大吸附容量几乎是β-Bi2O3的10倍。光催化活性的提高主要归因于可见光吸附能力的增强和光生电子空穴对更有效的分离。提出了一种基于价带偏移（ΔEVBO）和导带偏移（ΔECBO）的β-Bi2O3/ZrO2异质结的可能的Z型光催化机制。这项研究为构建新型介孔三元光催化剂提供了一种有效的方法，该催化剂具有更大的可及表面积和活性位点，用于通过协同吸附和光催化处理抗生素。图形摘要
A series of Z-scheme β-Bi2O3/ZrO2heterojunction composites containing three-dimensional (3D) mesoporous silica nanospheres (MSNs) were synthesized as efficient catalysts for antibiotic remediation. The obtained MSN/β-Bi2O3/ZrO2ternary composites possess novel lamellar cross structure, which is well constructed by β-Bi2O3nanosheets, 3D MSNs, and ZrO2nanoparticles. The optimal sample BZS-2 (Bi: Zr: Si = 1: 0.4: 0.33) shows an adsorptive-photocatalytic removal efficiency of 92.7% towards levofloxacin (LVF) and a total organic carbon (TOC) removal efficiency of 60.0% under simulated solar light irradiation for 100 min. BZS-2 can also remove 90.1% and 91.2% of tetracycline hydrochloride (TC) and oxytetracycline hydrochloride (OTC), respectively, and the maximum adsorption capacity of TC over BZS-2 is almost 10 times that of β-Bi2O3. The improvement of photocatalytic activity can be mainly attributed to the enhanced visible-light adsorption capacity and more efficient separation of photogenerated electron–hole pairs. A possible Z-scheme photocatalytic mechanism of β-Bi2O3/ZrO2heterojunctions based on valence band offset (ΔEVBO) and conduction band offset (ΔECBO) is proposed. This study provides an efficient way to construct novel mesoporous ternary photocatalyst with increased accessible surface area and active sites for treatment of antibiotics by synergistic adsorption and photocatalysis.Graphical abstract