Organic Pollutant Fenton Degradation Driven by Self-activated Afterglow from Oxygen-vacancy-rich LiYScGeO4: Bi3+ Long Afterglow Phosphor

doi:10.15541/jim20240495

Abstract

Abstract:

Self-activated long afterglow photocatalysts show great potential for all-weather wastewater treatment, with sustained photocatalytic activity even under dark conditions. However, the radiative combination of afterglow luminescence and photocatalytic degradation reaction has competitive utilization for photogenerated carriers, reducing afterglow duration and generating excessive hole accumulation, which significantly limits the efficiency of long afterglow driven photocatalytic degradation. Here, a long afterglow photocatalyst LiYGeO₄: Bi³ based on oxygen vacancy (V_O) was prepared, which released ultraviolet afterglow after activation by ultraviolet light irradiation and degraded organic pollutants via photocatalytic degradation driven by its own afterglow in dark condition. The trap concentration was improved by engineering oxygen vacancies and crystal fields, significantly enhancing the afterglow duration and intensity of V_O-LiYScGeO₄: Bi³⁺. A Fenton reaction system was constructed to further increase the concentration of active species, which maximized the photocatalytic degradation efficiency of V_O-LiYScGeO₄: Bi³⁺ during the afterglow duration. After 10 min UV irradiation to activate V_O-LiYScGeO₄: Bi³⁺ continuously released ultraviolet afterglow for photocatalytic degradation of Rhodamine B (RhB), reaching a degradation efficiency of 63% within 1 h in Fenton environment, which increased by 3.5 folds when compared to that of LiYScGeO₄: Bi³⁺ in the initial environment. This work provides a new approach for the design of afterglow photocatalysts and their application in wastewater treatment.

Key words: photocatalysis, photo-Fenton, oxygen vacancy, long afterglow, phosphor

CLC Number:

O643

FAN Xiaoxuan, ZHENG Yonggui, XU Lirong, YAO Zimin, CAO Shuo, WANG Kexin, WANG Jiwei. Organic Pollutant Fenton Degradation Driven by Self-activated Afterglow from Oxygen-vacancy-rich LiYScGeO₄: Bi³⁺ Long Afterglow Phosphor[J]. Journal of Inorganic Materials, 2025, 40(5): 481-488.

Figures/Tables 8

Fig. 1 Phase and morphology analyses of catalysts (a) XRD patterns of LiYGeO4: Bi3+, LiYScGeO4: Bi3+, and VO-LiYScGeO4: Bi3+; (b) EDS elemental mappings of VO-LiYScGeO4: Bi3+; (c) SEM image of VO-LiYScGeO4: Bi3+; (d) EDS spectrum of VO-LiYScGeO4: Bi3+

Fig. 2 Optical properties of LiYScGeO4: Bi3+ and VO-LiYScGeO4: Bi3+ (a) Long afterglow decay curves of LiY0.997-xScxGeO4: 0.003Bi3+ phosphors recorded at 355 nm after irradiation with 254 nm UV lamp for 10 min; (b) Fitted O1s XPS spectra; (c) UV-Vis DRS spectra with inset showing Tauc plots; (d) Emission spectra under 254 nm excitation; (e) TL spectra; (f) Afterglow decay curves Colorful figures are available on website

Fig. 3 Electrochemical performance of LiYScGeO4: Bi3+ and Vo-LiYScGeO4: Bi3+ (a) Afterglow photocurrent; (b) Steady-state photocurrent response; (c) Electrochemical impedance spectra; (d) Mott-Schottky plots

Fig. 4 (a) Photocatalytic degradation efficiency and (b) kinetic curves of LiYScGeO4: Bi3+ and VO-LiYScGeO4: Bi3+on RhB

Fig. 5 (a) Photocatalytic degradation efficiency and (b) kinetic curves of LiYScGeO4: Bi3+ and VO-LiYScGeO4: Bi3+on RhB in Fenton environment

Fig. 6 Analysis of photocatalytic degradation mechanism (a) Degradation efficiency of VO-LiYScGeO4: Bi3+ on RhB with addition of reactive species scavengers BQ, EDTA and IPA, with inset showing degradation curves; (b) Schematic diagram of degradation process of long afterglow luminescence photocatalyst VO-LiYScGeO4: Bi3+ in dark environment

Table S1 Afterglow decay parameters of LiYScGeO4: Bi3+ and VO-LiYScGeO4: Bi3+

Sample	A₁	τ₁/s	A₂	τ₂/s	R²
LiYScGeO₄: Bi³⁺	1.59×10⁵	592	1.17×10⁹	283	0.9834
V_O-LiYScGeO₄: Bi³⁺	4.11×10⁴	518	1.69×10⁵	573	0.9967

Fig. S1 Schematic illustration of UV long afterglow luminescence mechanism for LiYScGeO4: Bi3+ and VO-LiYScGeO4: Bi3+ photocatalysts

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Organic Pollutant Fenton Degradation Driven by Self-activated Afterglow from Oxygen-vacancy-rich LiYScGeO₄: Bi³⁺ Long Afterglow Phosphor

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