Rationally designed βCD-ZnO/ZnSe heterojunction with cavity structure for enhanced solar photocatalytic degradation of AZO

Tian, Fei; Yang, Yan; Zhang, Yi; Li, Xue; Liu, Xiaochen; He, Yanhui; Wu, Zhansheng

doi:10.1016/j.matlet.2022.132733

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“…The average diameter of ZnO nanoparticles was 20-50 nm with a hexagonal wurtzite structure, which was similar to that of ZnO/ZnSe composite in our previous report (Figure 2e). [11] ZnO/ZnSe was closely integrated with the βCD-AC (Figure 2f). When the catalyst was excited by light, the photogenerated electrons produced can transfer between the interface of ZnO and ZnSe.…”

Section: Structure and Morphology Characteristicsmentioning

confidence: 98%

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Preparation of βCD‐AC functionalized ZnO/ZnSe for photocatalytic degradation of organic dye wastewater

Tian

Yang

Zhang

et al. 2023

Applied Organom Chemis

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Conventional photocatalysts for degrading pollutants are limited because of the rapid recombination of electron-hole pair, difficulty in separation and recovery, and low efficiency in utilizing the visible light. To improve the adsorption capacity of the photocatalyst and reduce electron-hole recombination rate, βCD was anchored onto the porous activated carbon (AC) and then combined with ZnO/ZnSe to prepare βCD-AC-ZnO/ZnSe. The ZnO was a quasi-hexahedron shape in the ZnO/ZnSe heterojunction and was tightly integrated with the βCD-AC, which could improve the transfer ability of the photogenerated carrier. Considering the synergistic effect of βCD-AC and ZnO/ZnSe, the UV absorption edge was red shifted, and the lifetime of the electrons-hole pairs was prolonged. Thus, the photocatalytic degradation ration of βCD-AC-ZnO/ZnSe reached 82% under visible light, which was about 1.8 and 4.2 times higher than those of the virgin heterojunction and AC-ZnO/ ZnSe, respectively. βCD-AC-ZnO/ZnSe exhibited excellent disinfection potential that 3.5 log Escherichia coli cells were killed for 120 min. The highefficiency visible-light photocatalytic performance was demonstrated, and the •O 2À played a main active role in the photocatalytic removal of pollutants. The present research provided a valuable route for the fabrication of photocatalyst for real-world applications.

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Section: Structure and Morphology Characteristicsmentioning

confidence: 98%

“…ZnO/ZnSe was obtained according to previous research. [11] Zn (CH 3 COO) 2 (1.83 g) and oxalic acid (5.04 g) were dispersed in EtOH. The solution was heated in a muffle furnace at 400 C for 2 h to obtain the ZnO.…”

Section: Photocatalyst Preparationmentioning

confidence: 99%