A Facile Hydrothermal Method to Synthesize Nanosized Co 3 O 4 /CeO 2 and Study of its Catalytic Characteristic in Cataly
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A Facile Hydrothermal Method to Synthesize Nanosized Co3O4/CeO2 and Study of its Catalytic Characteristic in Catalytic Ozonation of Phenol Kun He Æ Yuming Dong Æ Lin Yin Æ Aimin Zhang Æ Zhen Li
Received: 20 March 2009 / Accepted: 7 May 2009 / Published online: 26 August 2009 Springer Science+Business Media, LLC 2009
Abstract In this paper nanosized Co3O4/CeO2 was successfully synthesized by a simple hydrothermal method and was applied as catalyst in catalytic ozonation of phenol in solution. The observed results show that nanoparticles have a pleasant special surface. Ozonation experiments indicate that the nanoparticles present a certain catalytic effect on the degradation of phenol and a remarkable acceleration on the chemical oxygen demand removal. Further investigations reveal that a mechanism of solid– liquid interface reactions exists in this system. Keywords Nanosized Co3O4/CeO2 Catalytic ozonation Phenol COD
1 Introduction Ozone has attracted much attention in water treatment due to its high reactivity with organic pollutants. However
K. He Research Institute of Petroleum Exploration and Development, PetroChina, 100083 Beijing, People’s Republic of China Y. Dong School of Chemical and Material Engineering, Jiangnan University, 214122 Wuxi, People’s Republic of China L. Yin (&) Z. Li Department of Earth Sciences, Nanjing University, 210093 Nanjing, People’s Republic of China e-mail: [email protected] A. Zhang School of Chemistry and Chemical Engineering, Key Laboratory of Mesoscopic Chemistry, Nanjing University, 210093 Nanjing, People’s Republic of China
some refractory organic compound could not be oxidized efficiently and their byproducts are always more toxic and resistant, such cases will lead to a low mineralization level [1, 2]. To resolve this rub, catalytic ozonation, which includes homogenous and heterogeneous, was brought out. In homogeneous catalytic ozonation, catalysts presented are usually metal ions such as Fe(II), Mn(II), Ni(II), Co(II), Cd(II), Cu(II), Ag(I),Cr(III), Zn(II) and also alkaline compounds. As we know these metal ions would lead to a secondary pollution in water. Heterogeneous catalytic ozonation also has been studied a lot, catalysts proposed in this process are metal oxides, metals or metal oxides on supports (metal oxides, activated carbon and zeolite) [3–11], and several studies have been performed to present the mechanism of heterogeneous catalytic ozonation [11–14], Andreozzi et al. [12] have studied the mechanism of decomposition of oxalic acid with manganese dioxide ozonation, and have revealed that the catalytic effect should be mainly attributed to ozone adsorption and a series of reactions on catalyst surface. Beltra´n et al. [13] concluded that surface reactions between ozone and hydrogen peroxide on the activated carbon, which generated free radicals, played an important role on organic compound removal. Cooper and Burch [14] also reported that the presence of heterogeneous surfaces facilitated ozone to decompose in aqueous solution efficiently. All the
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