Synthesis of CaIn 2 O 4 Rods and Its Photocatalytic Performance Under Visible-light Irradiation
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Synthesis of CaIn2O4 Rods and Its Photocatalytic Performance Under Visible-light Irradiation Jianjun Ding Æ Song Sun Æ Jun Bao Æ Zhenlin Luo Æ Chen Gao
Received: 4 October 2008 / Accepted: 1 January 2009 / Published online: 30 January 2009 Ó Springer Science+Business Media, LLC 2009
Abstract A type of CaIn2O4 particle was synthesized at a relatively low temperature by a solution-combustion method using calcium nitrate and indium nitrate as oxidizers and glycine as a fuel, followed by a high-temperature postannealing, during which the nanometric grains of the as-combusted CaIn2O4 powder self-assembled into nanocapsules, and subsequently the nano-capsules linked end to end to form the regular CaIn2O4 rods with the diameter of 300 nm and the length of about 2 lm. The CaIn2O4 rods showed significantly higher photocatalytic activity for methylene blue degradation and toluene oxidation under visible-light irradiation than that of the sample synthesized by the conventional solid-state reaction. Particularly, the Ptdispersed CaIn2O4 rods exhibited excellent photocatalytic activity for water decomposition under visible-light irradiation. The high crystallization degree, low impurity level and relatively large surface area of CaIn2O4 rods were considered as the important factors for its high photocatalytic performance. Keywords CaIn2O4 rods Solution-combustion method Visible-light Photocatalysis
J. Ding S. Sun J. Bao (&) Z. Luo C. Gao (&) National Synchrotron Radiation Lab, University of Science & Technology of China, 230029 Hefei, Anhui, People’s Republic of China e-mail: [email protected] C. Gao e-mail: [email protected] C. Gao Hefei National Laboratory for Physical Sciences at the Micorscale, University of Science & Technology of China, 230029, Hefei, Anhui, People’s Republic of China
1 Introduction The development of visible-light induced photocatalyst is of great importance for the efficient utilization of solar energy or indoor artificial light in the photocatalytic degradation of organic pollutants and splitting of water. Until now, most of the related studies have been focused on the modification of TiO2, an ultraviolet (UV) light photocatalyst, to shift its absorption band into the visible range [1–3]. A few efforts have also been carried out on the development of new materials with intrinsic visible photocatalytic activity, represented by the recent significant work of Zou and Domen et al. [4–7] in which a series of new semiconductor oxides were developed to exhibit a strong photocatalytic effect on water splitting and organic contaminant degradation under the visible-light irradiation, such as In0.9Ni0.1TaO4 and (Ga1-xZnx)(N1-xOx). More recently, Inoue and Zou et al. have demonstrated that the p-block metal oxides of MIn2O4 (M = Ca, Sr, Ba) have good photocatalytic activity for degrading organic pollutants such as methylene blue (MB) under visible-light irradiation or splitting of water into hydrogen and oxygen by the dispersion of RuO2 under the UV irradiation [8–14]. The p-block metal oxides are elec
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