School of Engineering, Discipline of Chemical Engineering, University of KwaZulu-Natal, Durban 4000, South Africa.
Molecules. 2023 Jan 28;28(3):1272. doi: 10.3390/molecules28031272.
The potential use of magnetic nanopowder for phenol adsorption mobilised on natural grain carbon foam from an aqueous solution was studied. Phenolic compounds are priority pollutants with high toxicity even at low concentrations. A magnetic nanopowder was synthesised by dissolving an iron sponge in nitric acid to produce iron nitrate, which was added to a natural grain mixture with flour as the main ingredient. The synthesised carbon foam was investigated for the effects of initial concentration, time, and TEM (transmission electron microscopy) characterisation. The phenol adsorption increased as the iron content of the carbon foam and the initial concentration increased. A kinetic study showed that the phenol adsorption data adequately covered all the carbon foam samples tested using an equation corresponding to a pseudo-first order chemical reaction. The Freundlich, Langmuir, and Temkin equations were tested for modelling the adsorption isotherms at equilibrium, and it was concluded that the Temkin model fit the experimental data adequately. Due to its exceptional physical and chemical properties, carbon magnetic nanopowder is regarded as an outstanding pollutant absorber in environmental investigations. R values derived from the pseudo-first-order model exceed 0.99. R > 0.94 indicates that the Freundlich isotherm provides the best fit to the equilibrium data.
研究了从水溶液中利用天然颗粒碳泡沫上的迁移酚吸附的磁性纳米粉末的潜在用途。酚类化合物是具有高毒性的优先污染物，即使在低浓度下也是如此。通过将铁海绵溶解在硝酸中合成磁性纳米粉末，得到硝酸铁，然后将其添加到以面粉为主要成分的天然颗粒混合物中。研究了合成的碳泡沫对初始浓度、时间和 TEM（透射电子显微镜）特性的影响。随着碳泡沫中铁含量和初始浓度的增加，苯酚吸附增加。动力学研究表明，使用对应于准一级化学反应的方程，可以充分涵盖所有测试的碳泡沫样品的苯酚吸附数据。对平衡吸附等温线进行了 Freundlich、Langmuir 和 Temkin 方程的测试，得出的结论是 Temkin 模型很好地拟合了实验数据。由于其出色的物理和化学性质，碳磁性纳米粉末被认为是环境研究中杰出的污染物吸收剂。由准一级模型得出的 R 值大于 0.99。R>0.94 表明 Freundlich 等温线最适合平衡数据。
