| Z型异质结β-Bi2O3柱撑CoAl层状双金属氢氧化物复合材料的构建及其光催化降解性能 |
| Z-scheme heterojunction β-Bi2O3 pillared CoAl layered double hydroxide nanohybrid: Fabrication and photocatalytic degradation property |
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| 摘要: 采用剥离-重组法，以剥离的 CoAl层状双金属氢氧化物(CoAl-LDH)纳米片为主体，β-Bi2O3纳米胶粒为客体,成功制备了β-Bi2O3柱撑CoAl-LDH复合材料(β-Bi2O3/CoAl-LDH)。运用X射线衍射、透射电子显微镜、紫外可见吸收光谱和X射线光电子能谱等方法表征了材料的形貌、结构和光电化学特性。制备的 β-Bi2O3/CoAl-LDH 柱撑材料具有 2.1 nm的层间通道、62 m2·g-1的比表面积和良好的可见光响应能力。在可见光辐照下，以四环素(TC)为模型污染物，考察材料光催化降解率。结果表明，β-Bi2O3/CoAl-LDH催化剂在90 min内可降解91.3%的TC，降解率远高于非柱撑的β-Bi2O3和CoAl-LDH。自由基捕获实验表明，超氧自由基(·O2-)和羟基自由基(·OH)是光催化体系主要的活性自由基。柱撑复合的β-Bi2O3与CoAl-LDH之间的电子耦合作用构建了Z型异质结，提高了光生电子与空穴对的分离率，赋予了材料良好的光催化性能。 |
| 关键词: 光催化剂 氧化铋 层状双羟基氢氧化物 柱撑材料 Z型异质结 四环素 |
| 基金项目: 国家自然科学基金(No.21978246)和福建省自然科学基金(No.2014J01050，2023J01115)资助。 |
| Abstract: Employing an exfoliation-reassembly route, β-Bi2O3 pillared CoAl layered double hydroxide (CoAl-LDH) nanohybrid (β-Bi2O3/CoAl-LDH) was successfully fabricated using the delaminated CoAl-LDH nanosheets as the host and the β-Bi2O3 nanosol as the guest. The as-prepared catalyst morphology, structure, and photoelectrochemical behaviors were characterized by X-ray diffraction, transmission electron microscopy, UV-Vis absorption spectroscopy, X-ray photoelectron spectroscopy, etc. The pillared nanohybrid β-Bi2O3/CoAl-LDH shows a pillared interlayer region with a spacing of 2.1 nm, an expanded specific surface area of 62 m2·g-1, and superior visible-light response-ability. Under visible light radiation, the photocatalytic properties were investigated by tetracycline (TC) degradation. β Bi 2O3/CoAl-LDH exhibits a high degradation efficiency and 91.3% of TC was degraded within 90 min, much higher than its parents β-Bi2O3 and CoAl-LDH. The radial capture and electron paramagnetic resonance experiments reveal that oxygen radical ·O2- and hydroxyl radical ·OH were the predominant radicals in the photocatalytic system, which is attributed to the synergistic effect between β-Bi2O3 and CoAl-LDH. Their electronic coupling interactions lead to the formation of Z-scheme heterojunction in the pillared nanohybrid. The separation efficiency of the photogenerated electron-hole pairs is improved and the photocatalytic activity is enhanced significantly. |
| Keywords: photocatalyst bismuth oxide layered double hydroxide pillared composite Z-scheme heterojunction tetracycline |
| 投稿时间：2024-07-05 修订日期：2025-01-04 |
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| 张亚平,吴桐辰,郑云,林碧洲.Z型异质结β-Bi2O3柱撑CoAl层状双金属氢氧化物复合材料的构建及其光催化降解性能[J].无机化学学报,2025,41(3):531-539. |
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