Nanoporous ZnO nanostructures for photocatalytic degradation of organic pollutants
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Nanoporous ZnO nanostructures for photocatalytic degradation of organic pollutants Yulong Ying · Tao Song · Hongwen Huang · Xinsheng Peng
Received: 20 June 2012 / Accepted: 9 September 2012 / Published online: 12 October 2012 © Springer-Verlag Berlin Heidelberg 2012
Abstract ZnO porous bamboo-leave-like nanorods and nanoporous networks were prepared by thermal conversion from Zn2 CO3 (OH)2 ·H2 O bamboo-leave-like nanorods, Zn(OH)2 nanoparticle networks and Zn(OH)2 long nanostrand networks, respectively. Among them, the ZnO nanoporous networks prepared from Zn(OH)2 nanostrands had the highest surface area of 78.57 m2 /g and presented the best photocatalytic decomposition of organics. The morphologies of the Zn(OH)2 nanostructures significantly depended on the solvent used for the precursors of aminoethanol and Zn(NO3 )2 and then determined the corresponding structures and properties of the final ZnO nanostructures. The ethanol/water mixture solvent dramatically increased the stability of Zn(OH)2 nanostrands. This is very beneficial for the collection and application of Zn(OH)2 nanostrands.
1 Introduction Textile processing is one of the most polluting industrial processes in the world and the number-one source of water pollution, which generates many waste and hazardous
Electronic supplementary material The online version of this article (doi:10.1007/s00339-012-7273-z) contains supplementary material, which is available to authorized users. Y. Ying · T. Song · H. Huang · X. Peng () State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Zheda Road 38, Hangzhou 310027, China e-mail: [email protected] X. Peng Cyrus Tang Center for Sensing Materials and Applications, Zhejiang University, Zheda Road 38, Hangzhou 310027, China
streams [1]. In order to remove these pollutants from the environment, two traditional methods are disposed by various physical and chemical methods, such as physical adsorption on active carbon [2], coagulation/flocculation [3, 4], membrane separation [5], the electrocoagulation process [6] and so on. However, all the methods mentioned above just transfer the pollutants from water to another phase without destruction or have the other limitations [7]. Biotechniques are also applied for some compounds. But, due to their complex chemical structure and synthetic origin, it is hard to degrade them by single biological processes [8]. And, the bacteria need a certain suitable environment in order to remain alive. In recent years, advanced oxidation processes (AOPs) have been explored for the treatment of industrial waste water [9]. These processes have been defined as those which involve the generation of hydroxyl radicals in sufficient quantity to carry out the destruction of toxic pollutants [10]. Semiconductor-assisted photocatalyst is one of the most extensively investigated AOPs, mainly due to its capacity to degrade a high number of recalcitrant chemicals in gaseous or aqueous systems, through relatively inexpensive procedures [11]
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