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A comparative study of photocatalytic degradation of Rhodamine B using natural-based zeolite composites
Surfaces and Interfaces ( IF 6.2 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.surfin.2020.100611
Fadi Alakhras , Eman Alhajri , Redouane Haounati , Hassan Ouachtak , Abdelaziz Ait Addi , Tawfik A. Saleh

Abstract Numerous treatment methodologies have been applied to the degradation of dyes. In addition, the application of nanocomposites in the removal of the hazardous dye pollutants had received great attention because of its size and high reactive nature. In this study, the Zeo-TiO2 and Zeo-ZnO composite photocatalysts were successfully synthesized by a simple co-precipitation method. The obtained samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM) and N2 sorption-desorption isotherms (BET). Experimentally, in order to compare the performance of both catalysts, the photocatalytic activities were evaluated in the degradation of hazardous Rhodamine B dye in aqueous solution under UV-light. The results revealed that the Zeo-TiO2 composite exhibited superior photocatalytic performance with a degradation rate of 0.0559 min−1, which exceeded that of Zeo-ZnO composite by more than 3 times. For both of photocatalysis, superoxide radical (●O2−) and hydroxyl radical (●OH) dominates the degradation of RhB dye, while holes (h+) show a negligible contribution. Consequently, it can be revealed that the prepared natural-based zeolite photocatalysts can perform as potential composites in the degradation of organic contaminants under UV irradiation.

中文翻译:

天然基沸石复合材料光催化降解罗丹明B的比较研究

摘要 许多处理方法已应用于染料的降解。此外,纳米复合材料在去除有害染料污染物中的应用因其尺寸和高活性而受到极大关注。本研究通过简单的共沉淀法成功合成了Zeo-TiO2和Zeo-ZnO复合光催化剂。所得样品通过X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)和N2吸脱附等温线(BET)进行表征。实验上,为了比较两种催化剂的性能,在紫外光下对水溶液中有害的罗丹明 B 染料的降解进行了光催化活性的评估。结果表明,Zeo-TiO2 复合材料表现出优异的光催化性能,降解速率为 0.0559 min-1,是 Zeo-ZnO 复合材料的 3 倍以上。对于这两种光催化,超氧自由基(●O2-)和羟基自由基(●OH)在RhB染料的降解中占主导地位,而空穴(h+)的贡献可以忽略不计。因此,可以揭示制备的天然基沸石光催化剂可以作为潜在的复合材料在紫外线照射下降解有机污染物。
更新日期:2020-09-01
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