Visible and near-infrared light-driven photocatalytic activity of erbium-doped CaTiO3 system

被引：60

作者：

Lozano-Sanchez, L. M. ^{[1
]}

Obregon, S. ^{[2
]}

Diaz-Torres, L. A. ^{[3
]}

Lee, Soo-Wohn ^{[4
]}

Rodriguez-Gonzalez, V. ^{[5
]}

机构：

[1] Tecnol Monterrey, Monterrey 64849, Nuevo Leon, Mexico

[2] Univ Autonoma Nuevo Leon, Ctr Invest Ciencias Fis Matemat, Fac Ciencias Fis Matemat, San Nicolas De Los Garza 66451, Nuevo Leon, Mexico

[3] Ctr Invest Opt, Grp Espectroscopia Mat Avanzados & Nanoestruct EM, Guanajuato 37150, Leon, Mexico

[4] Sun Moon Univ, Dept Environm Engn, Asan Chungnam 336708, South Korea

[5] IPICYT, Div Mat Avanzados, San Luis Potosi 78216, SLP, Mexico

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2015年 / 410卷

基金：

新加坡国家研究基金会;

关键词：

Photocatalysis; Microwave synthesis; Upconversion; CaTiO3; Erbium; UP-CONVERSION LUMINESCENCE; NANOPARTICLES; SOLAR; EMISSION; DYNAMICS; DIOXIDE; GREEN; BLUE;

D O I：

10.1016/j.molcata.2015.09.005

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Erbium-doped CaTiO3 system has been prepared by a microwave-assisted hydrothermal method. The as-obtained photocatalysts were characterized by several techniques such as X-ray powder diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) surface area. From the structural characterization, it can be demonstrated that the presence of Er3+ ions would cause an increase of the cell volume of the CaTiO3 crystalline phase. The photocatalytic behavior of the samples was evaluated by means of the degradation of methylene blue under UV-vis-NIR irradiation. The results showed that the presence of Er3+ ions induces a significant increase of the photocatalytic activity of the system providing higher degradation rates (4.54 x 10(-5) s(-1)) with respect to pristine CaTiO3 (1.86 x 10(-5) s(-1)). However after a heat treatment at 850 degrees C, the photocatalytic efficiency of the system increased dramatically until values of 11.9 x 10(-5) s(-1). From experiments carried out under vis-NIR irradiation, it was possible to obtain experimental evidence of the presence of up-conversion process from Er3+ ions. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：19 / 25

页数：7

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