In this work, graphene modified with sodium dodecyl sulfate was used to remove Fe (III) and Al (III) from wastewater. Morphological and spectrophotometrical characterization was done to confirm synthesis. Modified graphene performance was studied; pH effect, time of maximal sorption, maximal concentration of absorbent and concentration of ions were studied, as well. Sorption kinetic studies and isotherm models were applied to know the sorption process spontaneity and carried out to evaluate theoretical characteristic rates and possible adsorption mechanisms. Scanning electron microscopy, transmission electron microscopy, and X-ray diffraction studies revealed that graphene surface was successfully modified with sodium dodecyl sulfate, which also was confirmed by Fourier transform infrared spectroscopy. Optimal pH for removal of Al (III) and Fe (III) was 8. The time of maximal adsorption for both ions was 120 min, and the best dose of graphene modified with sodium dodecyl sulfate for their sorption was 0.1 g/L values for Fe (III) and Al (III), indicating that adsorption was favorable. 1/n values revealed cooperative adsorption. The model of adsorption of Fe (III) and Al (III) fits better to Langmuir than the Freundlich model. It was found that graphene modified with sodium dodecyl sulfate sorption’s kinetic model fits with pseudo-second order for Al (III) and Fe (III).

中文翻译：

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十二烷基硫酸钠修饰的石墨烯片的结构增强，对Fe（III）和Al（III）的吸附性能

在这项工作中，用十二烷基硫酸钠改性的石墨烯用于去除废水中的Fe（III）和Al（III）。进行形态学和分光光度表征以确认合成。研究了改性石墨烯的性能；还研究了pH值，最大吸附时间，最大吸收剂浓度和离子浓度。应用吸附动力学研究和等温线模型来了解吸附过程的自发性，并进行了评估理论特征速率和可能的吸附机理。扫描电子显微镜，透射电子显微镜和X射线衍射研究表明，十二烷基硫酸钠成功修饰了石墨烯表面，傅立叶变换红外光谱也证实了这一点。去除Al（III）和Fe（III）的最佳pH为8。两种离子的最大吸附时间为120分钟，十二烷基硫酸钠修饰的石墨烯的最佳吸附剂量为0.1 g / L。 Fe（III）和Al（III），表明吸附良好。1 /n值表明协同吸附。Fe（III）和Al（III）的吸附模型比Freundlich模型更适合Langmuir。结果发现，十二烷基硫酸钠吸附动力学模型修饰的石墨烯与Al（III）和Fe（III）的拟二级吻合。