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Nguyễn Văn Hải, Nguyễn Thị Khánh Linh, Đinh Thị Hiền(2), Nguyễn Thị Anh Vui, Hoàng Như Vân(1)

TỔNG HỢP, KHẢO SÁT TÍNH CHẤT QUANG VÀ HOẠT TÍNH XÚC TÁC QUANG CỦA VẬT LIỆU NANO CeO2:0,04Sm3+ , xEu3+

SYNTHESIS, INVESTIGATION OF OPTICAL PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF CeO2:0,04Sm3+ , xEu3+ NANOCRYSTALS

Tạp chí Phân tích Hóa, Lý và Sinh học

2023

3

90

In this work, Sm3+/Eu3+co-dopped CeO2 phosphor was synthesized through sol-gel method combined with temperature calcination at 600℃. The crystal structure of powders was characterized by X-ray diffraction, and it revealed that all studied samples were single-phase with the cubic fluorite-type structure and space group Fm3m. The scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectra were employed to characterize the samples. The photoluminescence measurements displayed that all the samples had excellent optical properties at room temperature. Under 404 nm excitation, the CeO2: Sm3+ exhibited typical peaks at 567, 604, and 653 nm corresponding to transitions 4G5/2→6HJ (J = 5/2, 7/2, 9/2) of Sm3+. Meanwhile, CeO2:0,04Sm3+, xEu3+ phosphors exhibitedstrong orange-red emission both Sm3+ and Eu3+. The photocatalytic performance of CeO2:0,04Sm3+, xEu3+nanocomposites was tested under ultraviolet irradiation on an aqueous solution of methylene blue (MB) dye using an UV-C lamp. The degree of degradation was monitored by absorption spectroscopy. The photocatalytic degradation efficiency of CeO2:0,04Sm3+, 0,04Eu3+ was above 95% within only 90 min of irradiation.

In this work, Sm3+/Eu3+co-dopped CeO2 phosphor was synthesized through sol-gel method combined with temperature calcination at 600℃. The crystal structure of powders was characterized by X-ray diffraction, and it revealed that all studied samples were single-phase with the cubic fluorite-type structure and space group Fm3m. The scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectra were employed to characterize the samples. The photoluminescence measurements displayed that all the samples had excellent optical properties at room temperature. Under 404 nm excitation, the CeO2: Sm3+ exhibited typical peaks at 567, 604, and 653 nm corresponding to transitions 4G5/2→6HJ (J = 5/2, 7/2, 9/2) of Sm3+. Meanwhile, CeO2:0,04Sm3+, xEu3+ phosphors exhibitedstrong orange-red emission both Sm3+ and Eu3+. The photocatalytic performance of CeO2:0,04Sm3+, xEu3+nanocomposites was tested under ultraviolet irradiation on an aqueous solution of methylene blue (MB) dye using an UV-C lamp. The degree of degradation was monitored by absorption spectroscopy. The photocatalytic degradation efficiency of CeO2:0,04Sm3+, 0,04Eu3+ was above 95% within only 90 min of irradiation.

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