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首页> 外文期刊>Nanobiotechnology, IET >Functional group-assisted green synthesised superparamagnetic nanoparticles for the rapid removal of hexavalent chromium from aqueous solution
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Functional group-assisted green synthesised superparamagnetic nanoparticles for the rapid removal of hexavalent chromium from aqueous solution

机译：官能团辅助的绿色合成超顺磁性纳米颗粒，用于快速去除水溶液中的六价铬

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摘要

Superparamagnetic nanoparticles (NPs) prepared using the capping agent derived from the fruit extract were used to study the adsorption of chromium ions. Characterisation techniques such as scanning electron microscope, energy-dispersive X-ray, Fourier transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometer and thermo gravimetric analysis (TGA) were used to study the NP features and adsorption mechanisms. The maximum monolayer adsorption capacity calculated from the Langmuir isotherm was found to be 41 mg/g. The chemical nature of the adsorption is confirmed with the results of Dubinin-Radushkevich model and thermodynamic studies. In addition, thermodynamically favourable and spontaneous adsorption is considered to be a good indication for the removal of metal ions. Out of the kinetic models investigated, the experiments exhibited the best fit to pseudo-second-order model, advocating for surface-based adsorption, involving both physical and chemical interactions. It is also significant to note that 85% of the adsorption occurs in the first 10 min, and hence the selected adsorbent is also claimed for rapid removal of metal ions. The newly synthesised adsorbent hence possesses remarkable properties in terms of simple synthesising technique, low cost, rapid uptake and improved efficiency without generating harmful byproducts.
机译：使用源自水果提取物的封端剂制备的超顺磁性纳米颗粒（NPs）用于研究铬离子的吸附。利用扫描电子显微镜，能量色散X射线，傅立叶变换红外光谱，X射线衍射，振动样品磁力计和热重分析（TGA）等表征技术研究了NP的特征和吸附机理。由兰格缪尔等温线计算得出的最大单层吸附容量为41 mg / g。 Dubinin-Radushkevich模型的结果和热力学研究证实了吸附的化学性质。另外，热力学上有利和自发的吸附被认为是去除金属离子的良好指示。在所研究的动力学模型中，实验显示出最适合拟二阶模型，主张基于表面的吸附，涉及物理和化学相互作用。还值得注意的是，在最初的10分钟内发生了85％的吸附，因此，还要求保护所选的吸附剂以快速去除金属离子。因此，新合成的吸附剂在简单的合成工艺，低成本，快速吸收和提高的效率方面具有显着的性能，而不会产生有害的副产物。

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