Facile Synthesis of Monodisperse Porous ZnO Spheres by a Soluble Starch-Assisted Method and Their Photocatalytic Activity

Facile Synthesis of Monodisperse Porous ZnO Spheres by a Soluble Starch-Assisted Method and Their Photocatalytic Activity
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可溶性淀粉辅助法简易合成单分散多孔ZnO球及其光催化活性

DOI:
10.1021/jp110256s
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发表时间:
2011-03
影响因子:
3.7
通讯作者:
Shen, Xiong
Shen, Xiong
中科院分区:
化学3区
文献类型:
--
作者:
Yang, Yanqing;Zhang, Gaoke;Shen, Xiong

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在本研究中,通过简便且低成本的可溶性淀粉辅助方法制备了单分散多孔 ZnO 球。通过 X 射线衍射 (XRD)、拉曼光谱、扫描电子显微镜 (SEM)、场发射扫描电子显微镜 (FESEM)、透射电子显微镜 (TEM)、紫外可见漫反射光谱 (DRS)、热重和差示扫描量热法 (TG-DSC)、傅里叶变换红外 (FTIR) 光谱和 Brunauer-Emmett-Teller (BET) 分析对所得样品进行了表征。拉曼光谱显示未煅烧粉末由 ZnO 和淀粉组成。 BET分析表明,典型的多孔ZnO球中介孔(25 nm)和大孔(180 nm)共存。在室温下光催化降解罗丹明 B (RhB) 和 4-硝基苯酚 (4-NP) 水溶液中评估了所获得的 ZnO 样品的光催化活性。还讨论了所获得的多孔 ZnO 球的可能生长机制。
In this study, monodisperse porous ZnO spheres were fabricated by a facile and low-cost soluble-starch-assisted method. The as-obtained samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), UV−vis diffuse reflectance spectroscopy (DRS), thermogravimetric and differential scanning calorimetry (TG−DSC), Fourier transform infrared (FTIR) spectroscopy, and Brunauer−Emmett−Teller (BET) analysis. The Raman spectra revealed that the uncalcined powders were composed of ZnO and starch. The BET analysis showed that mesopores (25 nm) and macropores (180 nm) coexisted in the typical porous ZnO spheres. The photocatalytic activities of the as-obtained ZnO samples were evaluated in the photocatalytic degradations of aqueous solutions of rhodamine B (RhB) and 4-nitrophenol (4-NP) at room temperature. A possible growth mechanism of the as-obtained porous ZnO spheres is also discussed.
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