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| Z-scheme heterojunction β-Bi2O3 pillared CoAl layered double hydroxide nanohybrid: Fabrication and photocatalytic degradation property |
| Author Name | Affiliation | E-mail | | ZHANG Yaping | College of Harbour and Coastal Engineering, Jimei University, Xiamen, Fujian 361021, China | ypzhang@jmu.edu.cn | | WU Tongchen | College of Materials Science and Engineering, Huaqiao University, Xiamen, Fujian 361021, China | | | ZHENG Yun | College of Materials Science and Engineering, Huaqiao University, Xiamen, Fujian 361021, China | | | LIN Bizhou | College of Materials Science and Engineering, Huaqiao University, Xiamen, Fujian 361021, China | |
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| 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 |
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| ZHANG Yaping,WU Tongchen,ZHENG Yun,LIN Bizhou.Z-scheme heterojunction β-Bi2O3 pillared CoAl layered double hydroxide nanohybrid: Fabrication and photocatalytic degradation property[J].Chinese Journal of Inorganic Chemistry,2025,41(3):531-539. |
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