Z型异质结β-Bi_(2)O_(3)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 heterojunctionβ-Bi_(2)O_(3) pillared CoAl layered double hydroxide nanohybrid:Fabrication and photocatalytic degradation property

作　　者：张亚平[1] 吴桐辰 郑云 林碧洲[2] ZHANG Yaping;WU Tongchen;ZHENG Yun;LIN Bizhou(College of Harbour and Coastal Engineering,Jimei University,Xiamen,Fujian 361021,China;College of Materials Science and Engineering,Huaqiao University,Xiamen,Fujian 361021,China)

机构地区：[1]集美大学港口与海岸工程学院,厦门361021 [2]华侨大学材料科学与工程学院,厦门361021

出　　处：《无机化学学报》2025年第3期531-539,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21978246);福建省自然科学基金(No.2014J01050,2023J01115)资助。

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-Bi_(2)O_(3)纳米胶粒为客体,成功制备了β-Bi_(2)O_(3)柱撑CoAl-LDH复合材料(β-Bi_(2)O_(3)/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-Bi_(2)O_(3)/CoAl-LDH柱撑材料具有2.1 nm的层间通道、62 m^(2)·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-Bi_(2)O_(3)/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-Bi_(2)O_(3)和CoAl-LDH。自由基捕获实验表明,超氧自由基(·O_(2)^(-))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-Bi_(2)O_(3)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。Employing an exfoliation-reassembly route,β-Bi_(2)O_(3)pillared CoAl layered double hydroxide(CoAl-LDH)nanohybrid(β-Bi_(2)O_(3)/CoAl-LDH)was successfully fabricated using the delaminated CoAl-LDH nanosheets as the host and theβ-Bi_(2)O_(3)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 nanohybridβ-Bi_(2)O_(3)/CoAl-LDH shows a pillared interlayer region with a spacing of 2.1 nm,an expanded specific surface area of 62 m~2·g^(-1),and superior visible-light response-ability.Under visible light radiation,the photocatalytic properties were investigated by tetracycline(TC)degradation.β-Bi_(2)O_(3)/CoAl-LDH exhibits a high degradation efficiency and 91.3%of TC was degraded within 90 min,much higher than its parentsβ-Bi_(2)O_(3)and CoAl-LDH.The radial capture and electron paramagnetic resonance experiments reveal that oxygen radical·O_(2)~-and hydroxyl radical·OH were the predominant radicals in the photocatalytic system,which is attributed to the synergistic effect betweenβ-Bi_(2)O_(3)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.

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 

分 类 号：O614.532[理学—无机化学] O614.31[理学—化学] O614.812O643.361