سال انتشار: ۱۳۸۷

محل انتشار: دومین کنگره بین المللی علوم و فناوری نانو

تعداد صفحات: ۲

نویسنده(ها):

Aidin Lak – Department of Materials Science and Engineering and 2Institute for Nanoscience and Nanotechnology, Sharif University of Technology, P. O. Box 11365-9466, Azadi Avenue, Tehran, Iran
A Simchi –
Z. Ali. Nemati –

چکیده:

Efficient degradatation of water pollutants are the current concern of many efforts worldwide. Among the various conventional and advanced methods such as Advanced Oxidation Processes (AOPs), semiconductor-assisted photocatalysis has attracted great attention for its direct conversion of pollutants into harmless eco-friendly components in waste waters [1, 2]. Here, ZnO and TiO2 are the most promising candidates for usage due to their interesting properties including photo-stability, resistance to photo-corrosion, photo-sensivity and nontoxitic [3, 4]. In order to improve the properties of these semiconductors, synthesizing of coupled and capped nanostructures have been proposed. It has been reported that the efficiency of photo-induced charge separation can be improved by coupling two semicondutors with different energy levels [5]. This paper reports the synthesis of TiO2-capped ZnO nanoparticles through a two-step chemical method. The photocatalytic decolorization of Methylene blue (MB) by the core/shell nanostructure is shown and compared with hydrothermally synthesized ZnO and TiO2 (P-25, Degussa) nanoparticles