Sol-Gel technique, characterization and photocatalytic degradation activity of Manganese doped ZnO nanoparticles

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Main Group Chemistry Pub Date : 2023-11-16 DOI:10.3233/mgc-230067

A. Kistan, S. Mohan, S. Mahalakshmi, A. Jayanthi, A. J. Ramya, P. S. Karthik

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Abstract

Photocatalysis using semiconductor metal oxide stands out as a highly effective and efficient method for eliminating organic pollutants from wastewater. This study aims to assess the photocatalytic capabilities of Mn doped ZnO nanocomposites in degrading methylene blue (MB) dye under ultra-violet light exposure. This study details the synthesis of ZnO photocatalysts through a straightforward one-step sol-gel method, incorporating varying levels of Mn-doping (0%, 2% & 4%). The structural and optical attributes were examined using techniques such as powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and UV-Vis diffuse reflectance spectra. X-ray diffraction analyses verified the presence of a hexagonal wurtzite crystal structure in all synthesized samples, exhibiting a high degree of crystallinity. In addition, an investigation into the impact of Mn impurities on the photocatalytic performance of ZnO catalysts was conducted in the context of methylene blue (MB) degradation. The experimental findings revealed that the Mn doped ZnO nanoparticles produced exhibited significantly superior photocatalytic performance compared to pure ZnO when used in breaking down methylene blue under UV-light exposure. This study proposes that these Mn doped ZnO could serve as a highly effective photocatalyst for treating water contaminated with certain chemically persistent synthetic organic dyes. The improved photocatalytic capabilities of ZnO nanostructures doped with Mn were ascribed to the synergistic impact of increased surface area in ZnO nanosphere and enhanced efficiency in charge separation resulting from optimized Mn doping. A potential explanation for the heightened photocatalytic performance of Mn-doped ZnO nanostructures is proposed tentatively.

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掺锰氧化锌纳米粒子的溶胶-凝胶技术、表征和光催化降解活性

利用半导体金属氧化物进行光催化是消除废水中有机污染物的一种高效方法。本研究旨在评估掺杂锰的氧化锌纳米复合材料在紫外线照射下降解亚甲基蓝（MB）染料的光催化能力。本研究详细介绍了通过简单的一步溶胶-凝胶法合成氧化锌光催化剂的过程，其中掺入了不同程度的锰（0%、2% 和 4%）。利用粉末 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM)、透射电子显微镜 (TEM)、能量色散光谱 (EDS) 和紫外可见漫反射光谱等技术对其结构和光学属性进行了检测。X 射线衍射分析证实，所有合成样品都具有六方菱形晶体结构，结晶度很高。此外，还以亚甲基蓝（MB）降解为背景，研究了锰杂质对氧化锌催化剂光催化性能的影响。实验结果表明，与纯氧化锌相比，掺杂锰的氧化锌纳米粒子在紫外线照射下用于分解亚甲基蓝时，表现出明显优于纯氧化锌的光催化性能。本研究认为，这些掺杂锰的氧化锌可作为一种高效的光催化剂，用于处理被某些化学持久性合成有机染料污染的水。掺杂锰的氧化锌纳米结构的光催化能力之所以得到提高，是因为氧化锌纳米圈的表面积增大和优化掺杂锰后电荷分离效率的提高产生了协同效应。初步提出了掺锰氧化锌纳米结构光催化性能提高的潜在原因。

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来源期刊

Main Group Chemistry 化学-化学综合

CiteScore

2.00

自引率

26.70%

发文量

审稿时长

>12 weeks

期刊介绍： Main Group Chemistry is intended to be a primary resource for all chemistry, engineering, biological, and materials researchers in both academia and in industry with an interest in the elements from the groups 1, 2, 12–18, lanthanides and actinides. The journal is committed to maintaining a high standard for its publications. This will be ensured by a rigorous peer-review process with most articles being reviewed by at least one editorial board member. Additionally, all manuscripts will be proofread and corrected by a dedicated copy editor located at the University of Kentucky.