催化作用
硼氢化钠
纳米材料基催化剂
动态光散射
胶体金
表面等离子共振
Zeta电位
吸光度
纳米颗粒
化学
纳米技术
还原剂
环糊精
银纳米粒子
光化学
紫外可见光谱
化学工程
材料科学
有机化学
工程类
色谱法
作者
Ramar Rajamanikandan,Malaichamy Ilanchelian,Heongkyu Ju
标识
DOI:10.1016/j.optmat.2022.113294
摘要
We demonstrated the effective reduction of the organic pollutants, the nitroaromatics, via green sustainable chemistry using high efficacy of the catalytic materials, i.e., β-cyclodextrin (β-CD) functionalized Au nanoparticles (AuNPs). Eco-friendly and biocompatible techniques were employed to fabricate gold nanoparticles (AuNPs) from an Au precursor (HAuCl4) using β-CD that plays as both reducing and surface-functionalizing agents. Detailed investigation of β-CD AuNPs formation, their sizes with morphologies, the surface charge, and the hydrodynamic size in a colloidal medium were performed by ultraviolet–visible (UV–vis) absorbance spectroscopy, high-resolution transmission electron microscopy (HR-TEM), Zeta potential measurements, and the dynamic light scattering analysis, respectively. The plasmonic nanoparticle formation of the β-CD AuNPs led to the strong localized surface plasmon resonance peak at around the 520 nm wavelength. The catalytic activity of the β-CD AuNPs was evaluated using model reactions, including the catalytic conversion of nitroaromatics to the corresponding amino-aromatic compounds upon mixing sodium borohydride in a water medium. Chemical reactions of such catalytic reduction of nitroaromatics were tracked by UV–vis absorbance spectroscopy, showing high catalytic activity of β-CD AuNPs. We also provided a discussion on the possible pathways for the AuNPs-mediated catalytic reduction of nitroaromatics. The efficacy of the nanocatalysts presented to reduce nitroaromatics can hold a potential promise for detoxifying aquatic environments and their pharmaceutical applications.
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