Nanostructured hexagonal S-doped CeO2 for effective Rh-B and MB dye degradation

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-09-11 DOI:10.1016/j.molstruc.2024.140016

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引用次数: 0

Abstract

The photocatalytic efficiency of CeO₂₋_xS_x (x = 0.05, 0.1, 0.2, 0.3, 0.5) hexagonal nanoparticles (HNPs) prepared through the hydrothermal method were tested by performing the degradation of Rhodamine-B and Methylene blue dyes under UV light irradiation. These compounds were thoroughly characterised using XRD, FESEM, EDX, HRTEM, XPS, ESR, FTIR, Raman, UV–vis DRS, BET and PL techniques. XRD analysis verified the cubic crystal structure of S-doped and pure CeO₂ HNPs. HRTEM images clearly affirmed that S-doped CeO₂ is made from HNPs. Over 94 % of Rh-B and 72 % of MB dyes were degraded by S-doped CeO₂ for 180 min under UV light exposure, demonstrating its efficacy towards the photocatalytic activity (PCA). S-doped CeO₂ HNPs have enhanced the PCA due to the reduction in the recombination rate of photo-generated electron-hole pairs, the rise in oxygen vacancy (O_v) and the narrowed optical band-gap. The photoluminescence findings clearly validated the increased PCA of S-doped CeO₂. The scavenger tests confirmed the OH^• and ^•O₂⁻ radicals participation in the quick degradation of both Rh-B and MB dyes.

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通过水热法制备的 CeO2-xSx（x = 0.05、0.1、0.2、0.3、0.5）六方纳米粒子（HNPs）在紫外光照射下降解罗丹明-B 和亚甲蓝染料，对其光催化效率进行了测试。使用 XRD、FESEM、EDX、HRTEM、XPS、ESR、FTIR、拉曼、UV-vis DRS、BET 和 PL 技术对这些化合物进行了全面的表征。XRD 分析验证了掺 S 和纯 CeO2 HNPs 的立方晶体结构。HRTEM 图像清楚地证实了 S 掺杂的 CeO2 是由 HNPs 制成的。在紫外光照射下，S 掺杂 CeO2 在 180 分钟内降解了 94% 以上的 Rh-B 和 72% 以上的 MB 染料，证明了其光催化活性（PCA）的有效性。由于光生电子-空穴对的重组率降低、氧空位（Ov）上升以及光带隙变窄，掺杂 S 的 CeO2 HNPs 增强了光催化活性。光致发光结果清楚地验证了 S 掺杂 CeO2 的 PCA 增加。清除剂测试证实 OH- 和 -O2- 自由基参与了 Rh-B 和 MB 染料的快速降解。

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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.

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