The influence of operational factors on the photocatalytic degradation of methylene blue dye in aqueous Sr-Au-ZnO suspensions under UV-A light

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-09-12 DOI:10.1016/j.molstruc.2024.139993

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Abstract

Any of several processes that break down dyes, ideally into harmless chemicals, is referred to as industrial dye degradation. Water waste discharges various colors, particularly those used in the textile industry like methyl red and methylene blue, into ecosystems, leading to significant pollution of the water supply. Under UV-A irradiation, the photocatalytic degradation of a commercial heterocyclic aromatic chemical molecule called methylene blue (MB) has been investigated using an aqueous solution of Sr-Au-ZnO as a photocatalyst. Research has been done on how different process characteristics affect the degradation process. For the mineralization of MB dye under UV-A light, it was found that the optimized Sr-Au-ZnO was more effective than commercial catalysts (ZnO and benchmark photocatalyst Degussa P25), single metal dopants (Sr-ZnO, Au-ZnO), and prepared ZnO. The effects of operational parameters, such as the quantity of photocatalyst, dye concentration, and starting pH, on the photo-mineralization of MB are analyzed before optimal values are given. Chemical oxygen demand (COD) measurements have confirmed that MB is mineralized. Using GC–MS analysis, the intermediates produced during photodegradation were predicted, and an appropriate degradation pathway was suggested. This procedure can be used for treating wastewater from sewage since optimized Sr-Au-ZnO is reusable.

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紫外-A 光下操作因素对 Sr-Au-ZnO 水悬浮液中亚甲基蓝染料光催化降解的影响

将染料分解成无害化学品的若干过程中的任何一个过程，都被称为工业染料降解。废水中排放的各种颜色，特别是纺织工业中使用的甲基红和亚甲蓝，会对生态系统造成严重污染。在紫外线-A 的照射下，使用 Sr-Au-ZnO 的水溶液作为光催化剂，研究了一种名为亚甲基蓝（MB）的商用杂环芳香族化学分子的光催化降解。对不同工艺特性如何影响降解过程进行了研究。研究发现，在 UV-A 光下，优化的 Sr-Au-ZnO 比商用催化剂（氧化锌和基准光催化剂 Degussa P25）、单一金属掺杂剂（Sr-ZnO、Au-ZnO）和制备的氧化锌更有效。在给出最佳值之前，分析了光催化剂数量、染料浓度和起始 pH 值等操作参数对甲基溴光矿化的影响。化学需氧量（COD）测量结果证实甲基溴已经矿化。通过气相色谱-质谱分析，预测了光降解过程中产生的中间产物，并提出了适当的降解途径。由于经过优化的 Sr-Au-ZnO 可重复使用，因此该程序可用于处理污水中的废水。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.