| 室温一步固相反应合成纳米氧化锌的表征、光催化性能及动力学 |
| Characterization, Photocatalytic Property and Kinetics of ZnO Nanoparticles Synthesized by One Step Solid State Reaction |
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| 摘要: 以七水硫酸锌、氢氧化钠为原料，采用室温一步固相反应合成ZnO纳米粒子，并分别利用X射线衍射分析（XRD）、傅里叶变换红外光谱分析（FTIR）、热重分析（TG）、扫描电子显微分析（SEM）、透射电子显微分析（TEM）、N2吸附-脱附、紫外可见漫反射光谱分析（UV-Vis DRS）等方法对ZnO纳米粒子进行表征。实验结果表明：不需任何添加剂，室温下可通过一步固相反应合成ZnO纳米粒子，其形成过程首先是ZnSO4·7H2O和NaOH充分接触，然后反应形成Zn4SO4（OH）6·5H2O，最后NaOH的溶解热可使Zn4SO4（OH）6·5H2O转变为ZnO并逐渐长大形成纳米粒子。同时以甲基橙为降解对象评价了ZnO纳米粒子的光催化活性，实验结果表明：紫外光照射下，该方法合成的ZnO纳米粒子对甲基橙具有较好的光催化活性，且光催化动力学方程符合准一级反应动力学。 |
| 关键词: 氧化锌 纳米粒子 一步固相反应 光催化性能 动力学 |
| 基金项目: 国家自然科学基金（No.51004066）和绵阳师范学院科研启动项目（No.QD2013A02）资助 |
| Abstract: ZnO nanoparticles were synthesized by one step solid state reaction using only zinc sulfate heptahydrate and sodium hydroxide. The synthesized samples were characterized with various analysis methods including of X-ray diffraction (XRD), Fourier transform infrared absorption spectroscopy (FTIR), Thermogravimetric analysis (TG), Scanning electron microscope (SEM), Transmission electron microscopy (TEM), N2 adsorpation-desorpation, and Ultraviolet visible diffuse reflectance spectrum (UV-Vis DRS). The experimental results indicate that the dosage of NaOH is an important parameter in the process, which can affect the composition, crystallinity and morphology of the ZnO nanoparticles. Mean while, the formation scheme of ZnO nanoparticles includes that ZnSO4·7H2O and NaOH were grinded to be full contact, then ZnSO4·7H2O reacted with NaOH to form Zn4SO4(OH)6·5H2O. Subsequently, ZnO crystal nucleus would be generated and grown into a ZnO sheets by the sufficient heat of solution from NaOH. In the final, the photocatalytic property and kinetics were evaluated by the photodegradation of methyl orange. The ZnO nanoparticles exhibit excellent photocatalytic activity under ultraviolet light. The photodegradation of methyl orange by ZnO nanoparticles conforms to the pseudo first order kinetics. |
| Keywords: ZnO nanoparticles one step solid state reaction photocatalytic property kinetics |
| 投稿时间：2017-01-08 修订日期：2017-04-01 |
| 摘要点击次数: 1890 |
| 全文下载次数: 1129 |
| 何登良,谭自香,田奇.室温一步固相反应合成纳米氧化锌的表征、光催化性能及动力学[J].无机化学学报,2017,33(6):1065-1073. |
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