Mn doping induced band gap narrowing and enhanced photocatalytic degradation in GdCoO3 perovskite

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-09-15 DOI:10.1016/j.vacuum.2025.114749

Keshav Kumar, Chandana Rath

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引用次数: 0

Abstract

In recent times, the demand for sustainable and cost-effective photocatalysts has been increasing day by day due to increasing pollutants in water caused by heavy discharge of organic waste through industries. Perovskite materials have emerged as promising candidates due to their excellent catalytic properties. Here, nanocrystalline GdCo_1-xMn_xO₃ (x = 0.0 to 0.30) perovskite materials are synthesized using sol-gel combustion method. Rietveld refinement of X-ray diffraction patterns demonstrates an increase in lattice volume and distortion of the orthorhombic structure, due to substitution of higher ionic radii Mn³⁺ ion. XPS analysis reveals the mixed oxidation states of 3+/4+ of Mn, accompanied with 2+/3+ states of Co and an increase in oxygen vacancies with the incorporation of Mn ions. The decrease in optical band gap from 1.87 to 1.32 eV with increasing x indicates the enhancement in photoinduced charge carriers. High degradation efficiency (∼93 %) of Congo red dye is achieved for x = 0.20 due to a suitable band gap, higher oxygen vacancies and larger surface area. Therefore, GdCo_0.80Mn_0.20O₃ may be suitable material for wastewater treatment in the textile industry. Furthermore, pH dependent catalytic behaviour and reaction kinetics are thoroughly discussed in the manuscript.

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Mn掺杂诱导GdCoO3钙钛矿带隙缩小并增强光催化降解

近年来，由于工业排放的大量有机废物导致水中污染物的增加，对可持续和经济高效的光催化剂的需求日益增加。钙钛矿材料由于其优异的催化性能而成为有前途的候选材料。本文采用溶胶-凝胶燃烧法合成了纳米晶GdCo1-xMnxO3 （x = 0.0 ~ 0.30）钙钛矿材料。x射线衍射图的Rietveld细化表明，由于取代了更高离子半径的Mn3+离子，晶格体积增加，正交结构扭曲。XPS分析显示Mn的混合氧化态为3+/4+，Co的混合氧化态为2+/3+，随着Mn离子的加入，氧空位增加。随着x的增加，光带隙从1.87 eV减小到1.32 eV，表明光诱导载流子的增强。当x = 0.20时，由于合适的带隙、更高的氧空位和更大的表面积，刚果红染料的降解效率很高（~ 93%）。因此，gdco0.80 mn0.200 o3可能是纺织工业废水处理的合适材料。此外，pH依赖的催化行为和反应动力学在手稿中进行了彻底的讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.