Sol–gel synthesized TiO2–CeO2 nanocomposite: an efficient photocatalyst for degradation of methyl orange under sunlight
Sol–gel synthesized TiO2–CeO2 nanocomposite: an efficient photocatalyst for degradation of methyl orange under sunlight
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DOI：
10.1007/s10854-015-3823-4
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发表时间：
2015
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影响因子：
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通讯作者：
T. M. Wandre;P. Gaikwad;A. Tapase;K. Garadkar;S. Vanalakar;P. Lokhande;R. Sasikala;P. P. Hankare-P.-P.-Hanka
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作者：
T. M. Wandre;P. Gaikwad;A. Tapase;K. Garadkar;S. Vanalakar;P. Lokhande;R. Sasikala;P. P. Hankare-P.-P.-Hanka
TiO2-CeO2 纳米复合材料是通过简单且经济有效的溶胶-凝胶法以十六烷基三甲基溴化铵（阳离子表面活性剂）作为封端剂在 500 °C 下合成的。 X射线衍射分析揭示了合成产物的相纯度。 X射线光电子能谱显示Ti元素为Ti4+氧化态，Ce元素以Ce3+和Ce4+氧化态的混合物存在。紫外-可见漫反射光谱清楚地表明 CeO2 纳米粒子的引入对 TiO2 纳米粒子的光学响应产生了积极的改变。扫描电子显微镜研究揭示了具有均匀尺寸分布的球形颗粒纳米团簇的形成。能量色散 X 射线分析证实了元素组成。傅里叶变换红外光谱分析证实在 900–400 cm−1 范围内存在 Ti–O–Ti 拉伸模式。光致发光光谱用于研究纳米复合材料中光激发电子空穴对的复合率和转移行为。此外，使用甲基橙研究了纯TiO2纳米颗粒和TiO2纳米复合材料的光催化活性。与纯TiO2纳米颗粒相比，TiO2:CeO2纳米复合材料表现出较高的染料降解性。复合材料 TiO2:CeO2(7:3) 在紫外线（60 分钟）和阳光（90 分钟）下对甲基橙染料的光催化降解效果最高。
The nanocomposites of TiO2–CeO2are synthesized by a simple and cost-effective sol–gel method with cetyl trimethyl ammonium bromide (cationic surfactant) as capping agent at 500 °C. The X-ray diffraction analysis revealed phase purity of synthesized product. The X-ray photoelectron spectroscopy showed Ti4+oxidation state of Ti element while Ce element was exist as a mixture of Ce3+and Ce4+oxidation state. The UV–Vis diffuse reflectance spectra clearly indicate the positive alteration in the optical response of TiO2nanoparticles by the introduction of CeO2nanoparticles. Scanning electron microscopic study revealed the formation of nanoclusters of spherical particles with uniform size distribution. Energy dispersive X-ray analysis confirmed the elemental composition. Fourier transform infrared spectroscopy analysis confirmed the presence of Ti–O–Ti stretching modes in the range of 900–400 cm−1. Photoluminescence spectroscopy was used to study the rate of recombination and transfer behaviors of photoexcited electron–hole pairs in the nanocomposites. Further, the photocatalytic activity of pure TiO2nanoparticles and nanocomposite of TiO2was studied using methyl orange. The TiO2:CeO2nanocomposites exhibit high dye degradation compare with pure TiO2nanoparticles. The composite TiO2:CeO2(7:3) shows highest photocatalytic degradation of methyl orange dye in UV (60 min) and sunlight (90 min).