Evaluation of Fe(III) adsorption onto palygorskite surfaces

Applied Surface Science

Spinelli

Souza

et al. 2015

Self Cite

a b s t r a c tRecently there has been considerable interest in magnetic sorbents materials, which is added excellent capabilities such as sorption and magnetic response to an applied field. Accordingly, palygorskite nanoparticles were covered by magnetite using a co-precipitation technique and characterized by: X-ray fluorescence (XRF), X-ray diffraction (XRD), surface analysing and scanning electron microscopy (SEM) with element analysis and mapping, particle size, pore surface area (BET), density, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and zeta potential. Additionally, magnetic properties were studied by SQUID magnetometer, magnetic force microscopy (MFM) and also using a simple experimental setup. Magnetic nanoparticles produced had average diameters in a nanometric range. The amount of iron present in the nanoparticles increased by six times after the magnetization and a superparamagnetic behavior was exhibited with high saturation magnetization, from 4.0 × 10 −4 Am 2 /kg to about 20 Am 2 /kg. A weight loss was also observed around 277 • C-339 • C by TGA, indicating a structural change from magnetite to maghemite, which confirms the magnetization of palygorskite. Batch adsorption experiments were carried out for the removal of methylene blue cationic dye from aqueous solution using pure and covered by magnetite palygorskite nanoparticles as adsorbents. Furthermore, about 90% of methylene blue was removed within 3 min using magnetized palygorskite.

Section: Resultsmentioning

confidence: 99%

Section: Zeta Potentialmentioning

confidence: 99%

“…The palygorskite magnetization was performed using coprecipitation of ferric and ferrous chloride [11,12] in an alkaline medium, as shown in Eq. (1):…”

Section: Sample Preparationmentioning

confidence: 99%

“…The samples were coated with Au (for SEM analysis), at 25 kV with small spot size as described before [11] and for EDX, the samples were not coated.…”

Section: Sem/edxmentioning

confidence: 99%

“…The chemical characterization was done using the X-ray fluorescence, X-ray diffraction and FT-IR, according to the literature [11].…”

Section: Chemical Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis and characterization of magnetic palygorskite nanoparticles and their application on methylene blue remotion from water

Applied Surface Science

Spinelli

Souza

et al. 2015

Self Cite

Magnetic polystyrene–palygorskite nanocomposite obtained by heterogeneous phase polymerization to apply in the treatment of oily waters

J of Applied Polymer Sci

Spinelli

Souza

et al. 2017

Self Cite

Water contaminated by oil poses challenges to the management of water resources. Magnetic nanoparticles has been issue of different potential applications including remotion oil from water. Magnetic polystyrene-palygorskite nanocomposites were prepared by a heterogeneous phase polymerization for the removal of organic contaminants from water. The organo-Fe 3 O 4 -palygorskite nanoparticles were coated with polystyrene, forming water repellent and oil absorbing surfaces to promote the removal of oil from the surfaces of nanocomposites by applying an external magnetic field. X-ray fluorescence, X-ray diffraction, scanning electron microscopy, zeta potential and size distribution measurement, surface area determination by BET, density measurement by He pycnometry, carbon grade determination, thermogravimetric analysis, Fourier-transform infrared spectroscopy, Raman spectroscopy, and evaluation of hydrophobicity by contact angle were used to characterize the nanoparticles. The magnetic nanocomposite obtained showed excellent hydrophobicity, around 788 contact angle. In addition, oil removal capability tests were also performed, according to which the preliminary results indicated removal of approximately 98% of oil in synthetic oily water samples. The oil-water separation using this magnetic nanocomposite provides a promising alternative strategy for water treatment.

Biodegradable PLA based nanocomposites for packaging applications: The effects of organo‐modified bentonite concentration

Lima

J of Applied Polymer Sci

Marconcini

et al. 2021

Self Cite

The effects of concentration and surface modification of two Brazilian bentonite clays on nanocomposites' properties based on polylactic acid – (PLA) were investigated. The samples were prepared by the extrusion/injection method to obtain biodegradable packaging plastics. The raw materials and their bionanocomposites were characterized by various techniques. Natural clay samples presented a size of around 2 μm while the modified ones' size was 5–6 μm, probably due to the presence of cetyltrimethylammonium bromide in the interlayer space. The particle size and the contact angle increased with the treatment and the clay's density decreased. The organoclays were homogeneously dispersed in PLA, which can be associated with the interactions between PLA chains' carbonyl groups and the organoclays. The bionanocomposites present modified clay particles axis aligned to the flow direction of the extruder/injector. Chocolate organoclay acts as a nucleating agent to PLA crystal growth, increasing the sample's crystallinity, while Bofe organoclay interferes with the amorphous chain's mobility and diminishes the sample's crystallization. The addition of both organoclays to PLA diminished the sample's elongation at break and strength, although the organoclays increased the sample's Young modulus, even though Bofe organoclay is more active in PLA amorphous phase and Chocolate organoclay on the crystalline one.