Citation: Tong WANG, Qinyue ZHONG, Qiong HUANG, Weimin GUO, Xinmei LIU. Mn-doped carbon quantum dots/Fe-doped ZnO flower-like microspheres heterojunction: Construction and photocatalytic performance[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(8): 1589-1600. doi: 10.11862/CJIC.20250011 shu

Mn-doped carbon quantum dots/Fe-doped ZnO flower-like microspheres heterojunction: Construction and photocatalytic performance

School of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, Guangxi 545005, China

Corresponding author: Xinmei LIU, xinmeiliu628@163.com
Received Date: 9 January 2025
Revised Date: 16 June 2025

Figures(8)

Flower-like Fe-doped ZnO (ZnFeO) microspheres were synthesized via a hydrothermal method, and Mn-doped carbon quantum dots (Mn-CQDs) were uniformly loaded onto the surface of ZnFeO through physical deposition, successfully constructing Mn-CQDs/ZnFeO heterojunction composites. The relationship between the structure and photocatalytic performance of Mn-CQDs/ZnFeO was investigated using X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet visible diffuse reflection spectroscopy (UV-Vis DRS), and N₂ adsorption-desorption analysis. The results showed that Mn doping significantly enhanced the light absorption range and photoluminescence (PL) stability of CQDs. The synergistic interaction between Mn-doped CQDs and Fe-doped ZnO extended the visible-light absorption edge of Mn-CQDs/ZnFeO, improved absorption intensity, and promoted the separation of photogenerated electron (e^-)-hole (h⁺) pairs between the interfaces of heterojunction, leading to enhanced photocatalytic performance. Under xenon lamp irradiation for 80 min, the degradation rate of methyl orange (MO) reached 91.4%, and remained at 80.7% after four consecutive cycles over Mn-CQDs/ZnFeO heterojunction. The radical capture experiment confirmed that the main active species that participated in MO degradation were both the photogenerated h⁺ and superoxide radical (·O₂^-).
- manganese-doped,
- carbon quantum dots,
- Fe-doped ZnO,
- heterojunction,
- photocatalysis
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