等离子体负载银(Ag)介孔CuO纳米复合材料光降解水中亚甲基蓝

IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL
Giday G. Welegergs, H. G. Gebretinsae, M. T. Girmay, Azole Sindelo, Abebe Tedla, Z. Y. Nuru, S. Dube, Malik Maaza, Tebello Nyokong
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引用次数: 0

摘要

水净化在许多发展中国家和发达国家仍然是一个挑战。因此,迫切需要有效和负担得起的方法。本研究以仙人掌梨提取物为原料,在可见光照射下合成了一种异相光催化剂Ag@CuO纳米复合材料(NCs),用于亚甲基蓝(MB)的分解。所获得的纳米复合材料由嵌入在氧化铜(CuO)半导体基体中的等离子体银(Ag) NPs组成。采用扫描电镜(SEM)、x射线衍射(XRD)、能量色散x射线能谱(EDX)和卢瑟福后向散射光谱(RBS)对样品的形貌和微观结构进行表征。Ag@CuO纳米颗粒的SEM图像证实了银纳米颗粒(NPs)在CuO纳米棒状表面具有较好的分散性。XRD谱图显示CuO为单斜晶相,Ag为面心立方相,EDX谱图证实了复合材料的组成。FT-IR证实了仙人掌梨中Ag NPs和Ag@CuO NCs形成的次生代谢物。通过N2吸附/解吸等温线计算CuO NPs和Ag@CuO NCs的BET比表面积,分别为8.67 m2 g−1和15.14 m2 g−1,具有介孔性质。研究了异相生物源Ag@CuO NCs在光催化下对亚甲基蓝(MB)染料的降解动力学速率(k = 0.0578 min−1)高于CuO (k = 0.0362 min−1)。Ag@CuO纳米碳纳米管具有优异的光催化活性是由于增强的光吸收、更高的吸附能力、改善的电荷分离和高的比表面积的协同作用。图形抽象
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Plasmonic Silver (Ag) Supported Mesoporous CuO Nanocomposites for Photodegradation of Methylene Blue in Water

Water decontamination remains a challenge in many developing and developed countries. And thus, efficient and affordable approaches are urgently needed. In this research work, a heterogeneous photocatalyst of Ag@CuO nanocomposites (NCs) has been successfully biogenic synthesized using Cactus pears extracts for the decomposition of methylene blue (MB) under visible light irradiation. The obtained nanocomposites consisted of plasmonic silver (Ag) NPs embedded in a semiconductor matrix of copper oxide (CuO). The scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), and Rutherford backscattering spectrometry (RBS) were employed to characterize the morphology, and microstructures of the samples. The SEM images of Ag@CuO NCs confirm the presence of better dispersibility of Ag nanoparticles (NPs) in the nanorod-like surface of CuO. XRD patterns revealed a well-crystalline nature of monoclinic phase of CuO and face centered cubic (fcc) of Ag metal, and EDX spectra confirms the compositions of the nanocomposites. The FT-IR confirmed the secondary metabolites in Cactus pears for the formation of Ag NPs, and Ag@CuO NCs. The Brunauer-Emmett-Teller (BET) surface area of CuO NPs, and Ag@CuO NCs were achieved from N2 adsorption/desorption isotherm and revealed a specific area of 8.67 m2 g−1 and 15.14 m2 g−1, respectively with a mesoporous nature. The heterogeneous biogenic Ag@CuO NCs was evaluated for the photocatalytic degradation of methylene blue (MB) dye upon light irradiation and demonstrated higher degradation kinetics rate (k = 0.0578 min−1) compared to CuO (k = 0.0362 min−1). The superior photocatalysis activity of Ag@CuO NCs is ascribed to the synergistic effects of enhanced light absorption, higher adsorption capacity, improved charge-separation and high surface area.

Graphical Abstract

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来源期刊
Catalysis Letters
Catalysis Letters 化学-物理化学
CiteScore
5.70
自引率
3.60%
发文量
327
审稿时长
1 months
期刊介绍: Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.
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