吸附和光催化在去除各种纺织染料方面的协同效应：二硫化钼-氧化锌混合物的卓越功效

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2024-10-30 DOI:10.1016/j.cattod.2024.115116

A. Dhariwal , D. Banerjee , N. Sen , N. Chakraborty , K.K. Chattopadhyay

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引用次数: 0

摘要

本研究报告介绍了在 200 °C 的适度温度下，通过原位水热法开发二硫化钼（MoS2）包裹氧化锌纳米棒的情况。通过不同的先进技术，如 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM)、傅立叶变换红外光谱 (FTIR)、紫外可见光 (UV-Vis) 和光致发光 (PL) 光谱，对开发的样品进行了表征。利用能量色散 X 射线（EDX）进行了成分分析，并利用热重分析和差热分析（TG-DTA）估计了样品在高温下的稳定性。XRD 显示，MoS2 的结晶度不高，而纯 ZnO 则显示出良好的结晶特征。FESEM 显微照片证实了 MoS2 在 ZnO 棒上的分形生长。傅立叶变换红外光谱显示了材料中存在的不同键，而紫外可见光谱则有助于了解所有样品的带隙。PL 研究表明，氧化锌发出的发光信号最强烈，同时带有带间转变和缺陷诱导转变的特征。混合样品的发射波长从深蓝色转移到了青色区域。研究表明，MoS2 在去除孟加拉玫瑰红、孔雀石绿、甲基橙或罗丹明 B 等不同纺织染料方面具有出色的功效，因此当它与氧化锌结合时，氧化锌的去除效率会显著提高。研究还表明，对于纯 MoS2 来说，吸附是去除染料的关键机制，而对于纯 ZnO 来说，光催化是去除染料的主要原因。在混合样品中，两个过程的协同效应产生了最佳效果，在大多数情况下，仅在 15 分钟内就能达到 90% 以上的去除率。我们努力从染料结构及其相互作用、样品的表面积和光带隙等方面来解释这一结果。

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Synergistic effect of adsorption and photo-catalysis in removal of various textile dyes: Excellent efficacy of molybdenum disulfide-zinc oxide hybrids

The present work reports the development of molybdenum disulfide (MoS₂) wrapped zinc oxide nano-rods through an in-situ hydrothermal approach at a moderate temperature of 200 °C. The as-developed samples were characterized by different sophisticate techniques like X-ray diffraction (XRD), Field emission scanning electron microscopes (FESEM), Fourier Transformed Infrared (FTIR), UV-Visible (UV-Vis) and photoluminescence (PL) spectroscopy. The composition analysis was done with the help of energy-dispersive x-ray (EDX) and stability of the sample against elevated temperature was estimated with the help of thermo gravimetric as well as differential thermal analysis (TG-DTA). XRD shows that the crystallinity of MoS₂ was not very high whereas pure ZnO shows well-crystalline features. FESEM micrographs confirmed growth of fractal nature of MoS₂ over ZnO rods. FTIR showed the different bond present in the material whereas UV-Vis spectra aided to have ideas about the band gap of all the samples. PL study shows that ZnO gives the most intense luminescence signal carrying the signature of both band to band and defect induced transition. In case of hybrid sample the emission wavelength gets shifted from dark blue to cyan region. It has been shown that the MoS₂ has excellent efficacy in removing different textile dyes like Bengal rose, malachite green, methyl orange or rhodamine B and thus when it is combined with ZnO the removal efficiency of the ZnO increases significantly. It has also been shown that for pure MoS₂ adsorption is the key mechanism of the dye removal whereas for pure ZnO photo-catalysis is the major contribution for the removal. In case of the hybrid sample, thus synergistic effect of the two processes gives the best result and in most of the cases over 90 % removal was achieved within 15 minutes only. Efforts have been given to explain the result in terms of dye structure and its interaction, surface area as optical band gap of the sample.

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.