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首页> 外文期刊>Separation and Purification Technology >Degradation of ibuprofen in the carbon dots/Fe3O4@carbon sphere pomegranate-like composites activated persulfate system
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Degradation of ibuprofen in the carbon dots/Fe3O4@carbon sphere pomegranate-like composites activated persulfate system

机译：碳点/ Fe3O4中布洛芬的降解碳球形石榴的复合材料活化过硫酸盐系统

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摘要

Carbon dots and nanomagnetites encapsulated in amorphous carbon spheres (CDs/Fe3O4@CS) with a pomegranate-like structure were synthesized via a solvothermal method and their peroxide activation performances for ibuprofen degradation were investigated in this work. The pomegranate-like nanocomposites, with an average diameter of 451.9 nm, possessed multicores and a 20-50 nm thick amorphous carbon shell. The multicores were composed of multiple 3.9-9.8 nm carbon dots and 5.6-18.6 nm nanomagnetites, as confirmed by Xray diffraction, X-ray photoelectron, Raman and photoluminescence spectra. The Fe3O4 loading was calculated to be 50.9 wt% according to thermo-gravimetric analysis. CDs/Fe3O4@CS had a specific surface area of 101.5 m(2)/g and the saturation magnetization of 26.8 emu/g. The CDs/Fe3O4@CS formation mechanism was proposed based on the characterization results. CDs/Fe3O4@CS exhibited high catalytic activities for peroxymonosulfate, persulfate and H2O2 with and without visible light illumination, and persulfate showed higher ibuprofen degradation efficiencies. The amorphous carbon shell might benefit ibuprofen enrichment, the nano Fe3O4 provided sufficient reactive sites to activate persulfate, and the CDs could accelerate the degradation due to their excellent electron donating and accepting abilities. The ibuprofen degradation in the CDs/Fe3O4@CS activated persulfate system followed a pseudo-first-order kinetic model and the activation energy was derived as 27.2 kJ/mol. The CDs/Fe3O4@CS also presented good reusability performances in the repeated experiments with visible light illumination. Singlet oxygen, hydroxyl and sulfate radicals were verified and the roles of these reactive species in ibuprofen degradation pathways were discussed based on intermediate analysis. The pomegranate-like nanocomposites might provide a potential promising catalyst for pollution control technologies.
机译：通过溶液的方法合成封装在无定形碳球中的碳点和纳米磁石（CDS / Fe3O4 @ Cs），并通过溶液方法合成，并在这项工作中研究了对布洛芬降解的过氧化物活化性能。平均直径为451.9nm，具有多或20-50nm厚的无定形碳壳的石榴纳米复合材料。多理机由多个3.9-9.8nm碳点和5.6-18.6nm纳米磁石组成，如X射线衍射，X射线光电子，拉曼和光致发光光谱所证实。根据热重量分析，计算Fe3O4负荷为50.9wt％。 CDS / Fe3O4 @ CS的比表面积为101.5米（2）/ g，饱和磁化为26.8 emu / g。基于表征结果提出了CDS / FE3O4 @ CS形成机制。 CDS / Fe3O4 @ CS表现出具有且没有可见光照射的过氧键硫酸盐，过硫酸盐和H 2 O 2的高催化活性，过硫酸盐显示出更高的布洛芬降解效率。无定形碳壳可能有利于布洛芬富集，纳米Fe3O4提供足够的活化位点以激活过硫酸盐，并且CD由于其优异的电子提供和接受能力而加速降解。 CDS / Fe3O4 @ CS激活过硫酸盐系统中的布洛芬降解遵循伪一阶动力学模型，激活能量衍生为27.2kJ / mol。 CDS / Fe3O4 @ CS还呈现了具有可见光照明的重复实验中的良好可重用性表现。验证了单态氧，羟基和硫酸根，基于中间分析讨论了这些反应性物种在布洛芬降解途径中的作用。石榴状纳米复合材料可提供潜在的污染控制技术催化剂。

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