Removal of Methylene Blue by Hydrogels based on N, N-Dimethylacrylamide and 2-Oxazoline macromonomer

Santillán, Fátima; Rueda, Juan Carlos

doi:10.1007/s10965-020-02239-6

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…In Figure 5a, it can be seen that the removal with homopolymer hydrogels is low due to their non-ionic character. The removal percentage of the HGs increases with increasing IA content in the polymer chains due to the electrostatic interaction between the negative charge of the carboxylate groups (-COO − ) of IA and the positive charge (=N + −(CH 3 ) 2 ) of methylene blue [47]. It can also be observed that the removal percentage of the MHGs is higher than that of the non-magnetic hydrogels.…”

Section: Methyl Blue Adsorptionmentioning

confidence: 97%

Preparation and Characterization of Fe3O4/Poly(HEMA-co-IA) Magnetic Hydrogels for Removal of Methylene Blue from Aqueous Solution

Ludeña,

Meza,

Huamán

et al. 2023

Gels

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In the present study, Fe3O4/poly(2-hydroxyethyl methacrylate-co-itaconic acid) magnetic hydrogels (MHGs) were prepared by in situ synthesis of Fe3O4 magnetic particles in hydrogels (HGs). The resulting magnetic hydrogels were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), a vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), and N2 adsorption–desorption. The effect of Fe3O4 on the swelling behavior and adsorption of methylene blue (MB) dye of the prepared hydrogel was studied. Parameters such as the dose, pH, contact time, and MB initial concentration were investigated. The results show that 75% (HG) and 91% (MHG) of MB (200 mg/L) were removed at doses of 2 mg/mL and 1 mg/mL, respectively, under a pH of 6.8 and a contact time of 10 min. The adsorption behavior followed the Langmuir isotherm model, indicating that the adsorption process takes place in monolayers and on homogeneous surfaces. The Langmuir capacities for MB adsorption using the HGs and MHGs were 78 and 174 mg/g, respectively. The adsorption kinetics followed a pseudo-second-order kinetic model. In addition, thermodynamic studies carried out show that the adsorption process is spontaneous and endothermic. Adsorption–desorption studies indicate that the magnetic hydrogel can remove MB for four cycles with removal efficiencies above 90%. Therefore, a MHG is suitable as an alternative material for MB adsorption.

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Section: Methyl Blue Adsorptionmentioning

confidence: 97%