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Adsorption mechanism of polyethyleneimine modified magnetic core–shell Fe3O4@SiO2 nanoparticles for anionic dye removal

机译：聚乙烯亚胺修饰的核-壳型Fe3O4 @ SiO2纳米粒子吸附阴离子染料的吸附机理

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In this paper, polyethyleneimine modified magnetic core–shell Fe _(3) O _(4) @SiO _(2) nanoparticles (Fe _(3) O _(4) @SiO _(2) /PEI) were innovatively synthesized and investigated using various techniques such as TEM, TGA, FT-IR, XRD, VSM and XPS. The adsorption performance based on the removal of the anionic dyes Methyl orange and Congo red from aqueous solution was studied systematically. The results showed that the adsorption rate of anionic dyes MO and CR increased rapidly then decreased gradually as the pH increased, the adsorption capacity of Fe _(3) O _(4) @SiO _(2) /PEI for MO was better than that for CR, and the maximum adsorption capacity for MO and CR was 231.0 mg g ~(?1) at pH 4 and 134.6 mg g ~(?1) at pH 6, respectively. The equilibrium adsorption capacities for MO and CR increased rapidly in the initial 40 min, and reached equilibrium in approximately 180 min, while the adsorption capacity for MB was relative low even negligible, demonstrating the strong adsorptive affinity of Fe _(3) O _(4) @SiO _(2) /PEI toward anionic compounds. Both of the adsorption processes followed the pseudo-second-order kinetics model and the Freundlich isotherm model. The mechanism of adsorption was mainly related to electrostatic attraction and the number of active sites occupied by anionic dyes. This study provides valuable guidance and is an effective method for the removal of anionic dyes from aquatic environments.
机译：本文创新地合成了聚乙烯亚胺改性的磁核-壳Fe _（3）O _（4）@SiO _（2）纳米粒子（Fe _（3）O _（4）@SiO _（2）/ PEI）并使用各种技术进行了调查，例如TEM，TGA，FT-IR，XRD，VSM和XPS。系统地研究了从水溶液中去除阴离子染料甲基橙和刚果红的吸附性能。结果表明，随着pH的升高，阴离子染料MO和CR的吸附速率迅速增加，然后逐渐下降，Fe _（3）O _（4）@SiO _（2）/ PEI对MO的吸附能力优于pH值为4时，MO和CR的最大吸附容量分别为231.0 mg g〜（？1）和pH 6时为134.6 mg g〜（？1）。 MO和CR的平衡吸附容量在开始的40分钟内迅速增加，并在约180分钟内达到平衡，而MB的吸附容量相对较低甚至可以忽略不计，表明Fe _（3）O _（ 4）@SiO _（2）/ PEI对阴离子化合物。两种吸附过程均遵循拟二级动力学模型和Freundlich等温模型。吸附机理主要与静电吸引和阴离子染料占据的活性位点数量有关。这项研究提供了有价值的指导，是从水生环境中去除阴离子染料的有效方法。

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