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Vol. 28 No. 5 (2016): Vol 28 Issue 5

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Effects on Photocatalytic Degradation and Hydrogen Evolution of TiO2 Coated CaLa2(MoO4)4 and CaLa2(MoO4)4:Er/Yb Nano Core-Shells and their Upconversion Photoluminescence

https://doi.org/10.14233/ajchem.2016.19601
Won-Chun Oh
Department of Advanced Materials Science & Engineering, Hanseo University, Seosan 356-706, Republic of Korea
She Ye
Department of Advanced Materials Science & Engineering, Hanseo University, Seosan 356-706, Republic of Korea
Jung Gyu Park
Department of Advanced Materials Science & Engineering, Hanseo University, Seosan 356-706, Republic of Korea
Chang Sung Lim
Department of Advanced Materials Science & Engineering, Hanseo University, Seosan 356-706, Republic of Korea

Corresponding Author(s) : Chang Sung Lim

cslim@hanseo.ac.kr

Asian Journal of Chemistry, Vol. 28 No. 5 (2016): Vol 28 Issue 5

Abstract

Titanium(IV) dioxide coated CaLa2(MoO4)4 and CaLa2(MoO4)4:Er/Yb nano core-shells were successfully synthesized using two-step procedures of the microwave sol-gel and ultrasonic methods. Well-crystallized nano core- shells showed a fine and homogeneous morphology with particle sizes of 10-20 nm. The degradation efficiency for TiO2 coated CaLa2(MoO4)4 and CaLa1.7(MoO4)4:Er0.1Yb0.2 nano core-shells under visible light resulted in the order as 10 wt % > 15 wt % > 5 wt %. Quantum yield of the nano core-shells for the hydrogen evolution provided the best result for 10 wt % of TiO2 coated CaLa1.5(MoO4)4:Er0.05Yb0.45 with 6.19 %, using Na2S/Na2SO3 as the reagent. Under excitation at 980 nm, the upconversion of CaLa1.7(MoO4)4:Er0.1Yb0.2 and CaLa1.5(MoO4)4:Er0.05Yb0.45 particles exhibited a strong 525 nm and a weak 550 nm emission bands in the green region. The Commission Internationale de L’Eclairage (CIE) diagram showed a good match with yellowish green emissions.

Keywords

Photocatalytic degradation Hydrogen evolution Nano core-shells Upconversion photoluminescence
Oh, W.-C., Ye, S., Park, J. G., & Lim, C. S. (2016). Effects on Photocatalytic Degradation and Hydrogen Evolution of TiO2 Coated CaLa2(MoO4)4 and CaLa2(MoO4)4:Er/Yb Nano Core-Shells and their Upconversion Photoluminescence. Asian Journal of Chemistry, 28(5), 1108–1114. https://doi.org/10.14233/ajchem.2016.19601
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