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題名 | 水熱法合成奈米氧化鋅錫粉體之研究=Characteristics of Zn₂SnO₄ (ZTO) Nanoparticles Synthesized via Hydrothermal Method |
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作者姓名(中文) | 吳玉祥; 廖嘉禾; | 書刊名 | 中華科技大學學報 |
卷期 | 41 2009.11[民98.11] |
頁次 | 頁1-18 |
分類號 | 468.8 |
關鍵詞 | 水熱法; 氧化鋅錫; 礦化劑; 光觸媒; 尖晶石; Hydrothermal method; Zn₂SnO₄; ZTO; Mineralizer; Photocatalytic activity; Spinel; |
語文 | 中文(Chinese) |
中文摘要 | 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72 h 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528 cm-1 和 668 cm-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。 |
英文摘要 | 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 hoursreaction 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. |
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