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采用化学沉淀法制备氧化亚锡纳米粒子的最新生物合成技术及其光催化应用。

State-of-the-art biosynthesis of tin oxide nanoparticles by chemical precipitation method towards photocatalytic application.

机构信息

Department of Chemical Engineering, Jashore University of Science and Technology, Jashore, 7408, Bangladesh.

Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada.

出版信息

Environ Sci Pollut Res Int. 2022 Feb;29(8):10871-10893. doi: 10.1007/s11356-021-17933-1. Epub 2022 Jan 8.

DOI:10.1007/s11356-021-17933-1
PMID:34997495
Abstract

Tin oxide (SnO) with versatile properties is of substantial standing for practical application, and improved features of the material are demonstrated in the current issue through the integration of nanotechnology with bio-resources leading to what is termed as biosynthesis of SnO nanoparticles (NPs). This review reveals the recent advances in biosynthesis of SnO NPs by chemical precipitation method focused on distinct methodologies, characterization, and reaction mechanism along with a photocatalytic application for dye degradation. According to available literature reviews, numerous bio-based precursors selectively extracted from biological substrates have effectively been applied as capping or reducing agents to achieve the metal oxide NPs. The major precursor obtained from the aqueous extract of root barks of Catunaregam spinosa is found to be 7-hydroxy-6-methoxy-2H-chromen-2-one that has been proposed as a model compound for the reduction of metal ions into nanoparticles due to having highly active functional groups, being abundant in plants (67.475 wt%), easy to extract, and eco benign. In addition, the photocatalytic activity of SnO NPs for the degradation of organic dyes, pharmaceuticals, and agricultural contaminants has been discussed in the context of a promising bio-reduction mechanism of the synthesis. The final properties are supposed to depend exclusively upon a number of factors, e.g., particle size (< 50 nm), bandgap (< 3.6 eV), crystal defects, and catalysts dosage. With this contribution, it has been perceived not only to provide an overview of recent advances in the biosynthesis of SnO NPs but also to indicate the main issues in need aiming to show vision towards innovative outcomes.

摘要

氧化锡(SnO)具有多种特性,在实际应用中具有重要地位,通过将纳米技术与生物资源相结合,实现了所谓的 SnO 纳米粒子(NPs)的生物合成,从而展示了该材料的改进特性。本综述揭示了通过化学沉淀法合成 SnO NPs 的最新进展,重点介绍了不同方法、表征和反应机制,以及光催化染料降解应用。根据现有文献综述,从生物基质中选择性提取的许多基于生物的前体已被有效地用作包覆或还原剂,以实现金属氧化物 NPs。从 Catunaregam spinosa 根皮的水提物中获得的主要前体被发现是 7-羟基-6-甲氧基-2H-色烯-2-酮,由于具有高度活跃的官能团,在植物中含量丰富(67.475wt%),易于提取,且生态友好,因此被提议作为将金属离子还原成纳米粒子的模型化合物。此外,还讨论了 SnO NPs 对有机染料、药物和农业污染物的光催化活性,以说明合成的生物还原机制的前景。最终性能应该完全取决于许多因素,例如粒径(<50nm)、带隙(<3.6eV)、晶体缺陷和催化剂剂量。通过这一贡献,不仅提供了对 SnO NPs 生物合成最新进展的概述,而且还指出了需要解决的主要问题,旨在展示创新成果的前景。

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