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首页> 外文期刊>RSC Advances >Rhodamine B degradation by nanosized zeolitic imidazolate framework-8 (ZIF-8)
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Rhodamine B degradation by nanosized zeolitic imidazolate framework-8 (ZIF-8)

机译：纳米级咪唑沸石骨架8（ZIF-8）降解罗丹明B

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Adsorption and photodegradation of rhodamine B by ZIF-8 nanocrystals were studied using spectroscopic techniques coupled with density functional theory (DFT) cluster calculations. A fast adsorption rate was observed in the dark, but upon exposure to visible light or UV irradiation the adsorption rate noticeably increased. Although several studies previously reported this phenomenon involving bulk ZIF-8 powder, this is the first mechanistic study to our knowledge that demonstrates adsorption and degradation of rhodamine B by nanosized ZIF-8 under various light conditions. The combined study of N _(2) sorption pore analysis and surface-sensitive X-ray photoelectron spectroscopy (XPS) confirmed the surface adsorption was mainly due to the open metal sites and surface groups of nanoporous ZIF-8. The fluorescence studies suggested ZIF-8 nanocrystals were able to generate hydroxyl radicals in water but only under UV illumination. The work presented here provides an insight into understanding nanoscale metal–organic frameworks (MOFs) in the removal of organic molecules from wastewater.
机译：使用光谱技术结合密度泛函理论（DFT）簇计算研究了ZIF-8纳米晶体对若丹明B的吸附和光降解。在黑暗中观察到快速的吸附速率，但是在可见光或紫外线照射下，吸附速率明显提高。尽管之前有几项研究报道了这种现象，涉及大量的ZIF-8粉末，但这是我们所知的第一项机理研究，表明纳米ZIF-8在各种光照条件下对罗丹明B的吸附和降解。 N_（2）吸附孔分析和表面敏感的X射线光电子能谱（XPS）的组合研究证实，表面吸附主要是由于纳米孔ZIF-8的开放金属位点和表面基团。荧光研究表明ZIF-8纳米晶体能够在水中产生羟基自由基，但只能在紫外线照射下产生。本文介绍的工作为了解纳米级金属有机框架（MOF）去除废水中的有机分子提供了见识。

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