水熱法合成奈米氧化鋅錫粉體之研究

本研究利用水熱法，將含有鋅和錫離子之水溶液，依不同的鋅／錫莫耳比與鹼性礦化劑NaOH混合後，置於密封壓力釜中，在低溫與高壓下使水溶液達到超臨界狀態，透過在水熱溫度250℃、水熱反應時間為72h的控制長晶條件，讓鋅與錫粒子間充分交互作用，並形成高結晶性奈米氧化鋅錫(Zn2SnO4, ZTO)粉末。實驗結果由XRD發現，以Zn/Sn莫耳比為2.5:1條件下，可達到結晶性最佳的ZTO奈米顆粒，由SEM照片中觀察到ZTO的表面形態呈現立方體，相較於其他條件的產物，不僅顆粒形狀尺寸一致且散佈也較為均勻；拉曼光譜顯示在528cm^(-1)和668cm^(-1)有二個ZTO特性峰值，由此可證明此奈米顆粒是含有尖晶石(Spinel)結構的ZTO奈米晶體；使用亞甲基藍溶液之降解反應作為ZTO粉末光觸媒活性之測定，其中在Zn/Sn莫耳比2.5:1獲得最佳的光觸媒降解效果，其所合成的Zn2SnO4三元氧化物光觸媒效果，較優於ZnO與SnO2之二元氧化物光觸媒效果。

關鍵字

水熱法；氧化鋅錫；礦化劑；光觸媒；尖晶石

並列摘要

The precursor powders including Zn and Sn ion with different molar ratios solution were utilized to synthesize Zn2SnO4 (ZTO) with NaOH as a basic mineralizer via hydrothermal method. Under low temperature 250℃ and high pressure for 72 hours reaction time, the solution in a sealed autoclave presented supercritical condition to make the Zn and Sn ion precursor reaction. The solution was heated to form high nano-crystalline ZTO powder. The crystal structure of composite powders is investigated by X-ray diffraction (XRD). The synthesized powders with Zn/Sn molar ratios 2.5:1 showed high crystalline ZTO nanoparticles. From the scanning electron microscopy (SEM) images, the cubic surface morphology of ZTO powders can be observed. The particles were relatively uniform and well-dispersed. The Zn/Sn molar ratio 2.5:1 sample showed Raman spectra peak at 528 cm^(-1) and 668 cm^(-1) that the ZTO sample had a spinel structure. Powders obtained from different Zn/Sn molar ratios were used in degradation reaction with methyl blue as indicator. The Zn/Sn molar ratio 2.5:1 sample appeared the best photocatalytic activity. Ternary oxide of Zn2SnO4 is relatively superior photocatalytic activity to the binary oxide of ZnO and SnO2.

並列關鍵字

hydrothermal method ； Zn2SnO4 ZTO ； mineralizer ； photocatalytic activity ； spinel

國際替代計量

水熱法合成奈米氧化鋅錫粉體之研究

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