Rare Metals ( IF 9.6 ) Pub Date : 2022-01-21 , DOI: 10.1007/s12598-021-01897-9 Chong Xu 1 , Qin Zhou 1 , Wei-Ya Huang 1 , Kai Yang 1 , Yong-Cai Zhang 2 , Tong-Xiang Liang 3 , Zhao-Qing Liu 4
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A series of Z-scheme β-Bi2O3/ZrO2 heterojunction composites containing three-dimensional (3D) mesoporous silica nanospheres (MSNs) were synthesized as efficient catalysts for antibiotic remediation. The obtained MSN/β-Bi2O3/ZrO2 ternary composites possess novel lamellar cross structure, which is well constructed by β-Bi2O3 nanosheets, 3D MSNs, and ZrO2 nanoparticles. 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/ZrO2 heterojunctions 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
中文翻译：
用 3D 介孔 SiO2 纳米球构建 Z 型 β-Bi2O3/ZrO2 异质结，通过协同吸附和光催化实现高效抗生素修复
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-Bi 2 O 3 /ZrO 2异质结复合材料，作为抗生素修复的有效催化剂。得到的MSN/β-Bi 2 O 3 /ZrO 2三元复合材料具有新颖的层状交叉结构，由β-Bi 2 O 3纳米片、3D MSNs和ZrO 2构成。纳米粒子。最佳样品 BZS-2 (Bi: Zr: Si = 1: 0.4: 0.33) 在模拟太阳光下对左氧氟沙星 (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%光照100分钟。BZS-2还能分别去除90.1%和91.2%的盐酸四环素（TC）和91.2%的盐酸土霉素（OTC），TC对BZS-2的最大吸附量几乎是β-Bi 2 O 3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-空穴对的更有效分离。β-Bi 2 O 3 /ZrO的一种可能的Z型光催化机理提出了基于价带偏移（Δ E VBO）和导带偏移（Δ E CBO ）的2种异质结。该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，该催化剂具有增加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。
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