Preparation of graphene oxide-maghemite-chitosan composites for the adsorption of europium Ions from aqueous solutions /
2022
Lujanienė, Galina, | Novikau, Raman, | Joel, Edith Flora, | Karalevičiūtė, Karolina, | Šemčuk, Sergej, | Mažeika, Kęstutis, | Talaikis, Martynas, | Pakštas, Vidas, | Tumėnas, Saulius, | Mažeika, Jonas, | Jokšas, Kęstutis,
The adsorption of Eu(III) on composites synthesised from graphene oxide (GO), ma-ghemite (MGH), and chitosan (CS) has been studied using different approaches. The physicochem-ical and morphological characteristics of the composites GO-MGH, GO-CS, GO-MGH-CS I, II, and III were determined by XRD, Mössbauer spectroscopy, FTIR, Raman spectroscopy, and TEM. Ac-cording to the results of batch experiments, the maximum experimental adsorption capacity was 52, 54, 25, 103, and 102 mg/g for GO-MGH, GO-CS, GO-MGH-CS I, II, and III, respectively. The data obtained are in better agreement with the Langmuir, pseudo-second-order, and pseudo-first-order models only for GO-MGH. Thus, the adsorption of Eu(III) on the composites was a favourable, monolayer, and occurred at homogeneous sites. The nature of adsorption is chemical and, in the case of GO-MGH, physical. Tests of the composites in natural waters showed a high removal effi-ciency for Eu(III), Pu(IV), and Am(III), ranging from 74 to 100%. The ANFIS model has quite good predictive ability, as shown by the values for R2, MSE, SSE, and ARE. The GO-MGH-CS composites with the high adsorption capacity could be promising candidates for the removal of Eu(III) and the pre-concentration of Pu(IV) and Am(III) from natural waters.
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