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Enhanced photocatalytic properties of CeO2/TiO2 heterostructures for phenol degradation
Colloid and Interface Science Communications ( IF 4.5 ) Pub Date : 2021-07-31 , DOI: 10.1016/j.colcom.2021.100476
Xueqin Wang 1, 2 , Helong Xu 1 , Xiaohang Luo 1 , Ming Li 1 , Man Dai 1 , Qihui Chen 1 , Hua Song 1
Affiliation  

Herein, CeO2/TiO2 heterostructures are synthesized adopt a simple and profitable sol-gel technique. The nanostructures comprised of ultrafine and well-distributed CeO2 nanoparticles on the TiO2 surface. The obtained catalysts were characterized via X-ray diffraction, nitrogen adsorption, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, photoluminescence spectroscopy, and ultraviolet (UV)-visible spectroscopy tests. The as-prepared heterostructures exhibited a visibly enhanced photodegradation performance using phenol(38 ppm) as the model of organic pollutants. The achieved degradation efficiency was 99.1% under UV-light irradiation for 120 min and the TOC removal was 81.31% when using CeO2/TiO2 as catalyst with the CeO2 loading of 0.5%. The enhanced property was ascribed to the formation of a heterojunction after coupling CeO2 with TiO2, which could capture the phenol molecules and improve the adsorption properties of the materials. Meanwhile, the heterostructures inhibited photogenic carriers recombination, thereby extending the optical response range. Furthermore, the as-prepared catalysts possessed favorable cycle performances and were reutilized for four cycles with insignificantly reduced property, the degradation rate were decreased slightly to 94.0% with a inappreciable decline in Ce and Ti leaching, suggesting it's preeminent stability and recyclability in the process of photocatalytic.



中文翻译:

CeO2/TiO2异质结构对苯酚降解的增强光催化性能

在此,CeO 2 /TiO 2异质结构的合成采用简单且有利可图的溶胶-凝胶技术。由超细且分布均匀的 CeO 2纳米粒子组成的纳米结构在 TiO 2 上表面。通过X射线衍射、氮吸附、傅里叶变换红外光谱、扫描电子显微镜、透射电子显微镜、光致发光光谱和紫外(UV)-可见光谱测试对所得催化剂进行了表征。使用苯酚(38 ppm)作为有机污染物的模型,所制备的异质结构表现出明显增强的光降解性能。当使用 CeO 2 /TiO 2作为催化剂且 CeO 2负载量为 0.5%时,在紫外光照射 120 分钟下实现的降解效率为 99.1%,TOC 去除率为 81.31 %。增强的性能归因于在将 CeO 2与 TiO 2偶联后形成异质结,可以捕获苯酚分子并提高材料的吸附性能。同时,异质结构抑制了上光载流子复合,从而扩大了光学响应范围。此外,所制备的催化剂具有良好的循环性能,可重复使用四次,性能降低不显着,降解率略微下降至 94.0%,Ce 和 Ti 浸出率下降幅度不大,表明其在该过程中具有卓越的稳定性和可回收性光催化的。

更新日期:2021-08-01
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