Enhanced Photocatalytic Activity of Bio-Mediated Ag@Cu2O NPs Towards Fampridine: Kinetic Modelling and Mechanistic Pathways

IF 2.9 4区工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY

Korean Journal of Chemical Engineering Pub Date : 2024-09-21 DOI:10.1007/s11814-024-00283-2

Pratibha Attri, Sangeeta Garg, Jatinder Kumar Ratan, Ardhendu Sekhar Giri

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Abstract

To enhance the photocatalytic activity of Cu₂O NPs, Tabernaemontana divaricata leaf extract was used to synthesize Ag@Cu₂O NPs. The synthesized Ag@Cu₂O NPs were characterized using UV–Vis, XPS, XRD, and HR-TEM. The mechanism of Ag onto Cu₂O NPs showed that the plant extract was fully saturated with flavonoids and can implant Ag onto Cu₂O NPs. XPS spectra showed a shift towards lower binding energy for Cu 2p peaks from 932 to 931 eV and 952 to 951 eV, which confirmed the formation of Ag@Cu₂O NPs. HR-TEM investigation indicated that the lattice distance was d = 0.25 nm which corresponds to the (111) plane of Ag, hence demonstrating the fabrication of Ag@Cu₂O NPs. The degradation efficiency of fampridine was enhanced using Ag@Cu₂O NPs to 95% with 97% chemical oxygen demand (COD) removal and 75% total organic carbon (TOC) conversion after 210 min of reaction time compared to Cu₂O NPs. The modified first-order kinetic (MFOK) model was well fitted for the TOC conversion of fampridine, with R² = 0.99 as compared to the first-order kinetic (FOK) model. Liquid chromatography–mass spectroscopy (LC–MS) spectra for the degradation of fampridine showed ten intermediate fragments. The synthesized Ag@Cu₂O NPs also showed a high inhibition zone for the two different bacterial pathogens.

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增强生物介导的 Ag@Cu2O NPs 对氨吡啶的光催化活性：动力学模型和机理途径

为了提高 Cu2O NPs 的光催化活性，研究人员使用 Tabernaemontana divaricata 叶提取物合成 Ag@Cu2O NPs。利用 UV-Vis、XPS、XRD 和 HR-TEM 对合成的 Ag@Cu2O NPs 进行了表征。Ag 植入 Cu2O NPs 的机理表明，植物提取物中的黄酮类化合物完全饱和，可以将 Ag 植入 Cu2O NPs。XPS 光谱显示，Cu 2p 峰的结合能从 932 到 931 eV 和 952 到 951 eV 之间向低结合能移动，这证实了 Ag@Cu2O NPs 的形成。HR-TEM 研究表明，晶格间距为 d = 0.25 nm，对应于 Ag 的（111）平面，从而证明了 Ag@Cu2O NPs 的制备。与 Cu2O NPs 相比，使用 Ag@Cu2O NPs 在 210 分钟的反应时间后，芳吡啶的降解效率提高到 95%，化学需氧量（COD）去除率为 97%，总有机碳（TOC）转化率为 75%。与一阶动力学（FOK）模型相比，修正的一阶动力学（MFOK）模型对芳吡啶的 TOC 转化具有良好的拟合效果，R2 = 0.99。芳吡啶降解过程的液相色谱-质谱（LC-MS）光谱显示出十个中间片段。合成的 Ag@Cu2O NPs 对两种不同细菌病原体也显示出较高的抑制区。

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来源期刊

Korean Journal of Chemical Engineering 工程技术-工程：化工

CiteScore

4.60

自引率

11.10%

发文量

310

审稿时长

4.7 months

期刊介绍： The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.