Poly(melamine-formaldehyde-silica) Composite Hydrogel for Methylene Blue Removal

Santos, Evânia Carvalho dos; Bandeira, Rafael Marinho; Vega, Maria Letícia; Júnior, José Ribeiro dos Santos

doi:10.1590/1980-5373-mr-2020-0574

Cited by 10 publications

(2 citation statements)

References 76 publications

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“…The foaming method was used for the encapsulation and for this, the resulting mixture was exposed to microwave radiation for 2 min in a microwave oven in a suitable container. Finally, it was taken into a modular square aluminum mold with an internal volume of 10 × 10 × 1 cm 3 , and the mixture was thermally treated for 1 h at 140 • C in a hot-air-heated oven to remove water, residual formaldehyde as well as complete curing [61].…”

Section: Methods 221 Preparation Of Organo-claymentioning

confidence: 99%

Preparation of Melamine Formaldehyde Foam and a Melamine-Formaldehyde-Organo-Clay Nanocomposite and Hybrid Composites

Gürses,

Şahin

2023

Minerals

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Mineral fillers can be added to thermoset polymers to improve thermal conductivity and deformation behavior, shrinkage, impact strength, dimensional stability and molding cycle time. This study aims to prepare various hybrid composites (MFHCs) using melamine formaldehyde foam (MF), a melamine formaldehyde organo-clay nanocomposite (MFNC) and also pumice as primary filler, and gypsum, kaolinite and a hollow glass sphere as secondary filler. It also focuses on the study of some mechanical properties and thermal conductivities, as well as their microscopic and spectroscopic characterization. For this, firstly, organo-clay was prepared with the solution intercalation method using montmorillonite, a cationic surfactant and long-chain hydrocarbon material, and then was produced using a melamine formaldehyde nanocomposite with in situ synthesis using a melamine formaldehyde pre-polymer and organo-clay. Finally, hybrid composites were prepared by blending various minerals and the produced nanocomposite. For morphological and textural characterization, both FTIR spectroscopy and XRD spectra, as well as SEM and HRTEM images of the raw montmorillonite (MMT), organo-montmorillonite (OMMT), pure polymer (MF) and prepared hybrid composites, were used. Spectroscopic and microscopic analyses have shown that materials with different textural arrangements and properties are obtained depending on effective adhesion interactions between polymer–clay nanocomposite particles and filler grains. Mechanical and thermal conductivity test results showed that melamine-formaldehyde-organo-clay nanocomposite foam (MFCNC) exhibited a very good thermal insulation performance despite its weak mechanical strength (λ: 0.0640 W/m K). On the other hand, among hybrid composites, it has been determined that the hybrid composite containing hollow glass beads (MFCPHHC) is a material with superior properties in terms of thermal insulation and mechanical strength (λ: 0.642 W/m K, bulk density: 0.36 g/cm3, bending strength: 228.41 Mpa, modulus of elasticity: 2.22 Mpa and screw holding resistance: 3.59 N/mm2).

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Section: Methods 221 Preparation Of Organo-claymentioning

confidence: 99%

Preparation of Melamine Formaldehyde Foam and a Melamine-Formaldehyde-Organo-Clay Nanocomposite and Hybrid Composites

Gürses,

Şahin

2023

Minerals

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“…The resulting mixture was exposed to microwave radiation for 2 min in a suitable container. Finally, the mixture was taken into a modular square aluminum mold with an internal volume of 10 x 10 x 1 cm 3 and subjected to heat treatment in a hot air heated oven at 140 °C for 1 hour to remove water and residual formaldehyde and ensure complete curing [82]. For textural, structural and crystallographic characterization of pure MF foam and MF organo clay nanocomposite foam, High-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR) and X-Ray diffraction (XRD) analyzes were carried out [83].…”

Section: Preparation Of Organo Claymentioning

confidence: 99%

Adsorption of Uranium (VI) from Aqueous Solution Using Melamine Formaldehyde Organo Clay Nanocomposite Foam as a Novel Adsorbent

Gürses,

Sehhatigdiri,

Yılmaz

et al. 2023

Preprint

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Uranium is a toxic radioactive element and is usually found in the environment in hexavalent form. It has become a necessity to remove uranium, which can enter the environment in excessive amounts through nuclear industrial activities, from access waters. Melamine formaldehyde organo clay nano composite foam (MFCNCF) was prepared as a novel adsorbent by hardening with thermal treatment. Structural, crystallographic textural and surface morphological characterization of the prepared adsorbent was made by FTIR and XRD spectroscopic and SEM and HRTEM microscopic techniques. This study aims to investigate the adsorption of U(VI) from aqueous solution by MF organo clay nanocomposite and its dependence on various variables such as initial uranium concentration, adsorption time, adsorbent dosage, initial pH, and temperature. Additionally, adsorption isotherm analysis and adsorption kinetics and thermodynamics were also examined. For this purpose, the batch adsorption experiments were carried out and the equilibrium concentration of U(VI) in the aqueous solution was measured with a UV-Vis spectrophotometer at a wavelength of 433 nm, which corresponds to its maximum absorptivity. The results regarding adsorption kinetics show that 30 min is sufficient to reach adsorption equilibrium and the data show a high fit to the pseudo-second-order kinetic model. Isotherm analysis also revealed a high fit of the data to the Type III isotherm and the Halsey model. Based on this fit, an adsorption mechanism involving two regions (electrostatic and complex formation) was proposed for the current adsorption system. The adsorption isosteric enthalpy and entropy values for the first and second regions are 3.65 and -51.02kJ/mol and 1.77 and -167.28J/mol, respectively. It was found in kmol. Experimental results showed that the prepared nanocomposite foam adsorbent is an effective and potential alternative for the effective removal of U(VI) from aqueous solutions.

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Determination of sulfonamides in milk and egg samples by HPLC with mesoporous polymelamine‐formaldehyde as magnetic solid‐phase extraction adsorbent

Liao

Ning

Zhang

et al. 2021

J of Separation Science

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In this work, magnetic mesoporous polymelamine-formaldehyde composites were synthesized via a facile Schiff base reaction. The magnetic mesoporous polymelamine-formaldehyde composites combined both the properties of mesoporous polymelamine-formaldehyde and the magnetism of NH 2 -SiO 2 @Fe 3 O 4 nanoparticles, possessing high specific surface area (150.66 m 2 g -1 ) and good magnetism (24.50 emu g -1 ). The magnetic mesoporous polymelamineformaldehyde composites were employed as magnetic adsorbent for the extraction of sulfonamides. Under optimal conditions, good linearities with correlation coefficients higher than 0.9984 were obtained between peak area and sulfonamides concentration (2-200 μg L -1 ) with limits of detection in the range of 0.33-0.58 μg L -1 . The established method was successfully applied for the determination of sulfonamides in egg and milk samples. The adsorption mechanisms demonstrated that the adsorption of magnetic mesoporous polymelamine-formaldehyde composites toward sulfonamides was a multilayer process, and adsorption kinetics followed the pseudo-second-order model.

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Poly(melamine-formaldehyde-silica) Composite Hydrogel for Methylene Blue Removal

Cited by 10 publications

References 76 publications

Preparation of Melamine Formaldehyde Foam and a Melamine-Formaldehyde-Organo-Clay Nanocomposite and Hybrid Composites

Preparation of Melamine Formaldehyde Foam and a Melamine-Formaldehyde-Organo-Clay Nanocomposite and Hybrid Composites

Adsorption of Uranium (VI) from Aqueous Solution Using Melamine Formaldehyde Organo Clay Nanocomposite Foam as a Novel Adsorbent

Determination of sulfonamides in milk and egg samples by HPLC with mesoporous polymelamine‐formaldehyde as magnetic solid‐phase extraction adsorbent

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