氧化鋅/過氧化鋅複合光觸媒材料之製備與活性分析
Other Title
Hydrothermal Synthesis of ZnO/ZnO2 Composite and Its Photocatalytic Activity
Journal
界面科學會誌
Journal Volume
26
Journal Issue
4
Start Page
191
End Page
198
Date Issued
2004-12
Author(s)
徐金正
Abstract
在某些情況下結合兩種以上的半導體會形成複合材料，其在光觸媒活性上優於任何一種組成此複合材料的半導體在單獨存在時的光觸媒活性。一般相信造成此種協同作用效應的其中一個主要原因來自於兩相之間緊密的接觸。在本研究中我們以以過氧化鋅為前驅物來製備氧化鋅/過氧化鋅的複合材料。其中氧化鋅/過氧化鋅複合材料所主現出的形態為在稜柱形氧化鋅結晶體的表面上有小顆粒狀的過氧化鋅「熔合」在其上。在光觸媒活性分析上，我們發現在過氧化鋅轉化成氧化鋅過程中所形成的兩相共存中間產物具有最大的光反應活性。與純的氧化鋅比較，此一中間產物因為其在氧化鋅/過氧化鋅的表面存在著緊密鍵結的異相結構而有較佳的光反應活性。
Combining of more than one semiconductors has in some cases resulted in composite photocatalysts that are superior to any of its constituents in terms of photocatalytic activity, and it is in general believed that one key factor to such a synergistic effect resides in intimate contact between the different phases. In this work, ZnO/ZnO2 composite photocatalysts were synthesized by hydrothermal treatment of ZnO2. The composite particles showed morphology of ZnO prismatic crystallites with small ZnO2 granules ”fused” at surface. Photocatalytic activity was characterized based on photocatalytic degradation of methyl orange under UV-light (300nm) illumination, and the maximum activity was observed for the powder with an intermediate ZnO2-to-ZnO conversion. The enhanced activity, as compared with the pure ZnO crystallites, has been attributed to the presence of the intimately bonded ZnO/ZnO2 surface hetero-structure.
Subjects
複合光觸媒
氧化鋅
過氧化鋅
水熱合成
Photocatalysis
ZnO
ZnO2
Hydrothermal synthesis
Type
journal article