Porous olive-like BiVO4: Alcoho-hydrothermal preparation and excellent visible-light-driven photocatalytic performance for the degradation of phenol
Porous olive-like BiVO4: Alcoho-hydrothermal preparation and excellent visible-light-driven photocatalytic performance for the degradation of phenol
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多孔类橄榄BiVO4：醇水热制备和优异的可见光驱动光催化性能用于降解苯酚
DOI：
10.1016/j.apcatb.2011.04.026
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发表时间：
2011-06
期刊：
影响因子：
--
通讯作者：
Deng, Jiguang
中科院分区：
文献类型：
--
作者：
Jiang, Haiyan;Dai, Hongxing;Meng, Xue;Ji, Kemeng;Zhang, Lei;Deng, Jiguang
以硝酸铋和偏钒酸铵为金属源，氢氧化钠为pH调节剂，乙醇和乙二醇为溶剂，十二胺(DA)、油胺(OL)或油酸(OA)为表面活性剂，采用醇-水热法合成了具有多种形貌和/或孔道结构的钒酸铋。利用X射线衍射仪、拉曼光谱、热重分析/差示扫描量热仪、红外光谱、比表面积、扫描电子显微镜、透射电子显微镜、X射线光电子能谱和紫外可见光谱等手段对材料进行了表征。在可见光照射下，考察了样品在少量H_2O_2存在下的光催化降解苯酚的性能，并考察了苯酚浓度对光催化活性的影响。结果表明，表面活性剂和pH值对产物的粒子形态乃至晶体结构有显著影响。以DA、OL或OA为表面活性剂，在pH=1.5或3.0，醇水热温度为100℃时，可以制备出单斜孔状BiVO4样品。当前驱体溶液的pH值提高到7.0和11.0时，前驱体溶液的pH值分别提高到7.0和11.0，可以得到短棒状单斜相BiVO4和多孔层状正交球状Bi4V2O11。在BiVO4样品中，比表面积为12.7×m2/g的橄榄状多孔样品对苯酚的可见光催化降解性能最好。结果表明，橄榄状多孔BiVO4样品具有较高的比表面积和表面氧空位密度、多孔结构、较低的带隙能和独特的形貌与其优异的光催化活性有关。
Bismuth vanadates with multiple morphologies and/or porous structures were prepared using the alcoho-hydrothermal strategy with bismuth nitrate and ammonium metavanadate as metal source, NaOH as pH adjustor, ethanol and ethylene glycol as solvent, and/or dodecylamine (DA), oleylamine (OL) or oleic acid (OA) as surfactant. The materials were characterized by means of the XRD, Raman, TGA/DSC, FT-IR, BET, SEM, TEM, XPS, and UV–vis techniques. The photocatalytic performance of the as-obtained samples was evaluated for the degradation of phenol in the presence of a small amount of H2O2under visible-light irradiation, and the effect of phenol concentration on the photocatalytic activity was also examined. It is found that the surfactant and pH value had a significant influence on the particle morphology and even the crystalline structure of the product. Porous olive-like monoclinic BiVO4samples could be prepared with DA, OL or OA as surfactant at pH = 1.5 or 3.0 and alcoho-hydrothermal temperature = 100 °C. With DA as surfactant at an alcoho-hydrothermal temperature of 100 °C, short-rod-like monoclinic BiVO4and porous sheet-layered spherical orthorhombic Bi4V2O11were obtained when the pH value of the precursor solution was raised to 7.0 and 11.0, respectively. Among the BiVO4samples, the porous olive-like one with a surface area of 12.7 m2/g exhibited the best visible-light-driven photocatalytic performance for phenol degradation. It is concluded that the excellent photocatalytic activity of the porous olive-like BiVO4sample was associated with its higher surface area and surface oxygen vacancy density, porous structure, lower bandgap energy, and unique morphology.
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作者：
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DOI：
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发表时间：
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期刊：
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