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

Tóm tắt

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 Fm
3
m. 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 exhibited
strong 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.