Efficient and rapid sunlight-driven photocatalytic degradation of methylene blue dye using multiferroic BiFeO3 nanoparticles

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-11-06 DOI:10.1007/s10971-024-06607-2

Madhu Verma, Ajay Kumar, Vijay Kumar Thakur, Akanksha Maurya, Sachin Kumar, Saurabh Singh, Simant Kumar Srivastav

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Abstract

The current investigation presents a facile and cost-effective sol-gel approach for the synthesis of phase-pure multiferroic bismuth ferrite (BiFeO₃) nanoparticles (BFO NPs) by using propylene glycol as a complexing agent, intended for use as a photocatalyst to efficiently degrade organic dyes in aqueous solutions under natural sunlight. Characterization techniques, including thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD), elucidated a plausible reaction pathway for the formation of phase-pure BFO NPs. Rietveld refinement of the XRD data, in conjunction with transmission electron microscopy (TEM) and Raman spectroscopy, confirmed the synthesis of single-phase BFO NPs at 400 °C, displaying a space group of R3c and an average crystallite size of 25 nm. UV–visible diffuse reflectance spectroscopy revealed an absorption cut-off wavelength near 590 nm, corresponding to a band gap of 2.08 eV, indicating the capability of BFO NPs to absorb visible light within the 400–590 nm range. BFO NPs have shown efficient and rapid photocatalytic degradation of methylene blue (MB) in acidic, neutral, and basic pH conditions under natural sunlight. This is attributed to the intrinsic ferroelectric and ferromagnetic ordering present in synthesized BFO NPs which facilitates the separation and migration of photoinduced charges through band bending phenomena at the interface.

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利用多铁BiFeO3纳米颗粒高效、快速地光催化降解亚甲基蓝染料

目前的研究提出了一种简单而经济的溶胶-凝胶方法，以丙二醇作为络合剂合成相纯多铁铋铁氧体（BiFeO3）纳米颗粒（BFO NPs），用于在自然阳光下有效降解水溶液中的有机染料的光催化剂。表征技术，包括热重分析（TGA），傅里叶变换红外光谱（FT-IR）和x射线衍射（XRD），阐明了相纯BFO NPs形成的合理反应途径。XRD数据的Rietveld细化，结合透射电子显微镜（TEM）和拉曼光谱，证实了在400°C下合成的单相BFO NPs，显示出R3c空间群，平均晶粒尺寸为25 nm。紫外-可见漫反射光谱显示，BFO NPs的吸收截止波长在590nm附近，对应的带隙为2.08 eV，表明BFO NPs有能力吸收400 - 590nm范围内的可见光。在自然光照下，BFO NPs在酸性、中性和碱性条件下都能高效、快速地光催化降解亚甲基蓝。这是由于合成的BFO NPs中存在固有的铁电和铁磁有序，通过界面处的带弯曲现象促进了光诱导电荷的分离和迁移。图形抽象

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.