Green Synthesis Montmorillonite Clay Supported Co3O4 Nanoparticles and Its Catalytic Efficacy Towards Baeyer–Villiger Oxidation

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-11-25 DOI:10.1007/s10562-024-04872-y

Subrat Jyoti Borah, Rashmi Rekha Hazarika, Sumit Gorh, Dipanka Dutta

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Abstract

Co₃O₄ nanoparticles supported on modified montmorillonite clay (Co₃O₄@Mont) were synthesized by using green natural extract (tulsi leaf) under mild reaction conditions. The modification of montmorillonite clay was executed by refluxing the clay with H₃PO₄ under controlled condition to generate a porous matrix with high surface area which acts as support for the generation and stabilization of nanoparticles. The Co₃O₄@Mont nanocomposite was characterized by UV–Visible spectroscopy, Scanning Electron Microscopy with Energy Dispersive X-Ray (SEM–EDX), Transmission Electron Microscopy (TEM), Powder X-Ray Diffraction (P-XRD) and N₂-adsorption–desorption analysis. The synthesized nanocomposite showed excellent catalytic efficacy towards the Baeyer–Villiger oxidation of various Ketones using H₂O₂ as oxidant at room temperature. The catalytic B-V oxidation gives the best results in aqueous medium and gives maximum conversion of the product in 1 h. The completion of the reaction in short time (1 h) under mild reaction conditions with green solvent signifies the applicability of the nano-catalyst for the B-V oxidation over other reported catalyst. Also, the catalyst can be recovered easily by simple filtration at the end of the reaction. Further, the recyclability of the used Co₃O₄@Mont nano-catalyst for the same substrate was performed and its catalytic efficacy is maintained without any significant loss for various catalytic cycles.

Graphical Abstract

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以蒙脱石粘土为载体的 Co3O4 纳米粒子的绿色合成及其对拜尔-维利格氧化作用的催化功效

在温和的反应条件下，利用绿色天然提取物（土尔其叶）合成了支撑在改性蒙脱石粘土（Co3O4@Mont）上的 Co3O4 纳米粒子。蒙脱石粘土的改性是通过在受控条件下用 H3PO4 回流粘土，生成具有高比表面积的多孔基质，作为纳米粒子生成和稳定的支撑。Co3O4@Mont 纳米复合材料通过紫外-可见光谱、扫描电子显微镜与能量色散 X 射线（SEM-EDX）、透射电子显微镜（TEM）、粉末 X 射线衍射（P-XRD）和 N2-吸附-解吸分析进行了表征。合成的纳米复合材料在室温下以 H2O2 为氧化剂对各种酮类化合物进行拜耳-维里格氧化反应时表现出卓越的催化功效。在水介质中，催化 B-V 氧化反应的效果最好，1 小时内产物的转化率最高。在温和的反应条件下，反应在短时间（1 小时）内完成，且溶剂为绿色，这表明纳米催化剂比其他已报道的催化剂更适用于 B-V 氧化反应。此外，催化剂在反应结束后只需简单过滤即可轻松回收。此外，还对使用过的 Co3O4@Mont 纳米催化剂进行了可回收性测试，测试结果表明，该催化剂可用于相同的底物，并且在各种催化循环中都能保持催化功效，没有任何明显的损失。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.