三元奈米金屬氧化物Zn1-xMnxSnO3其形貌控制與取代效應對若丹名B光催化降解之研究

The study of morphology control and doping effect in the ternary nanometal oxide Zn1-xMnxSnO3 for photocatalytic degradation of Rhodamine B

王偉丞(Wei-Cheng Wang)

中原大學/理學院/物理研究所/碩士(2011年)

https://doi.org/10.6840/CYCU.2011.00261

摘要

本研究利用水熱法進行ZnSnO3材料的形貌控制與取代效應之樣品合成。在形貌控制的部份，在合成的過程中乃添加不同數量之長碳鏈環六亞甲基四胺(Hexamethylenetetramine ; HMT)的參與，在取代效應部份，利用Mn2+來取代Zn2+的位置，合成出部分取代與完全取代之樣品Zn1-xMnxSnO3 (x= 0, 0.25, 0.5, 0.75, 1)。本研究分別以X-光粉末繞射儀、掃描式電子顯微鏡、BET表面積分析儀、紫外-可見光光譜儀與X-光吸收光譜等儀器，對樣品之結構、形貌、表面積和光催化效應等方面進行相關分析與探討。
在本研究中，發現HMT可改變ZnSnO3的形貌，當HMT添加劑量為2.5 g時，其形貌增大且變為八面體。另外Zn1-xMnxSnO3隨著Mn的取代量越多，使其晶面往低角度偏移，由X-光吸收光譜之R-space圖譜亦可證實Mn確實取代在Zn的位置上，且兩部分的晶相皆符合JCPD 11-0274。所有樣品之BET吸附曲線均為下凹型，其表面積依照樣品ZnSnO3、2.5g HMT ZnSnO3、Zn0.5Mn0.5SnO3和MnSnO3之順序，分別為5.9061、0.8181、15.3498和11.8014(m2/g)。將所有樣品與若丹名B(Rhodamine B)混合進行光催化實驗，前兩種樣品之光催化結果表示出表面積影響光催化速率；而後兩者得知，隋著取代變多，其光催化效果越差，表示Mn之光催化活性比Zn來的遲鈍。

關鍵字

若丹名 ； 三元奈米金屬氧化物 ； 光催化

並列摘要

In this study, hydrothermal method is employed to control the morphology and substitution effect of ZnSnO3 materials. Here the morphology can be controlled, by add different amount HMT. And the substitution effect, by using Mn2+ ions. Zn2+ can be obtaining partial or completely replaced in the samples(Zn1-xMnxSnO3, x= 0, 0.25, 0.5, 0.75, 1). The purity and composition of samples were characterized by X-ray powder diffraction, scanning electron microscope, BET theory, UV-vis spectrophotometer, and X-ray absorption spectroscopy.
The morphology of ZnSnO3 can be modified by HMT concentration. When HMT increased to 2.5g, the morphology was larger and become octahedral crystallites. More Mn2+ ions be substituted, the more octahedrons were formed. It is also confirmed by X-ray absorption spectroscopy. All the BET adsorption curves of samples is convex to the horizontal axis, the specific area of ZnSnO3, 2.5g HMT of ZnSnO3, Zn0.5Mn0.5SnO3 and MnSnO3, are 5.9061、0.8181、15.3498 and 11.8014 (m2/g), respectively. Photodegradation experiment with rhodamine B is also studied. The specific areas is affect on the rate of photodegradation directly. Poor activity of Mn substituted sample is observed.

並列關鍵字

photocatalytic degradation ； ternary nanometal oxide ； Rhodamine

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