Effect of sonication on the particle size of montmorillonite clays

Poli, Alessandra Lima; Batista, Tatiana; Cavalheiro, Carla Cristina Schmitt; Gessner, Fergus; Neumann, Miguel G.

doi:10.1016/j.jcis.2008.06.016

Cited by 89 publications

(44 citation statements)

References 25 publications

(34 reference statements)

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“…Twice the amount of surfactant was released from both clays into the ethanol suspensions held at 40°C after sonication than into the suspensions without sonication. Sonication helped to break down the clay clusters into smaller particles (Poli et al, 2008). With smaller particles, more surfactant was exposed to the solvent, leading to an increased amount of surfactant released from the clay.…”

Section: Effect Of Sonication On Surfactant Releasementioning

confidence: 99%

Release of surfactants from organo-modified montmorillonite into solvents: Implications for polymer nanocomposites

Xia

Rubino

Auras

2015

Applied Clay Science

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Section: Effect Of Sonication On Surfactant Releasementioning

confidence: 99%

Release of surfactants from organo-modified montmorillonite into solvents: Implications for polymer nanocomposites

Xia

Rubino

Auras

2015

Applied Clay Science

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“…The LSD technique shows the size of the organoclay aggregates and measures it at the same time, i.e, it has the potential to act as both a flocculant and a deflocculant depending on the concentration of the organoclay. Sonication has been used to reduce the size of clay particles in a study of the influence of ultrasound on the thermal behavior of clays minerals (Poli et al, 2008) and it was also observed that sonication produces a significant increase in the specific surface areas due to decreased particle size (Pérez-Rodriguez et al, 2006). The presence of adsorbed organic cations on a clay surface changes the surfaces of the clay from hydrophilic to hydrophobic and has a significant impact on the surface properties that influence the interactions among clay particles.…”

Section: Thermogravimetric Analysis (Tg)mentioning

confidence: 99%

Morphology, Structure, Thermal Stability, XR-Diffraction, and Infrared Study of Hexadecyltrimethylammonium Bromide–Modified Smectite

Messabeb-Ouali¹,

Benna-Zayani²,

Ayadi-Trabelsi³

et al. 2013

IJC

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We characterized the interlayer structure and morphology of modified natural clays. Organoclay-based materials are increasingly used for multiple applications. We modified a purified Na-bentonite using cation exchange with hexadecyltrimethyl ammonium bromide (HDTMA) and characterized it using; UV spectroscopy, X-ray diffraction, photoacoustic FTIR spectroscopy (PA-FTIR), thermogravimetric analysis (TGA) techniques, laser scattering distribution (LSD), atomic force microscopy (AFM) and transmission electron microscopy (TEM). The adsorption of HDTMA on interlayer sites of Na-smectite fraction is nearly total until an adsorption equivalent to 1.85 times the cation exchange capacity (CEC) of the clay. The formation of the HDTMA-smectite changes the properties of the clay from hydrophilic to hydrophobic. The XRD patterns show an increase in the basal spacings. TGA characterization and analysis were shown to be useful to estimate the amount of surfactant within the organoclay. LSD analyses have shown a decrease of the effective particle diameter with increasing sonication times. AFM images showed that these Na-smectite surfaces appeared foliated with irregular aggregate structures at high HDTMA loading. The present study shows that not only the basal spacing but the morphology and the particle size of the organoclay strongly depend on the packing density of surfactant within the smectite interlayer space.

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“…In order to increase the exchangeability potential of the mineral clays by modifying their chemical composition and crystal structure, they are submitted to different chemical and physical treatments, such as hydrothermal, acid and alkaline activation [1][2][3][14][15][16][17] . Recently, ultrasonic energy has also been applied for activating clays [18][19][20][21][22] . The purpose is to improve their surface characteristics by reducing the particle size due to a delamination effect and by breaking of layers in the other directions, while the crystalline character is retained.…”

Section: Introductionmentioning

confidence: 99%

Kinetics Studies on the Process of Zn Removal from Wastewater Using Ultrasonically Activated Sorbents

Flores¹

2017

Chem.Biochem.Eng.Q.

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Heavy metals pollution in industrial wastewater is a great environmental challenge. Several techniques and materials have been recently proposed in order to overcome this problem, such as the adsorption process; however, in order to be competitive, new improved low-cost materials must be proposed or developed. In the present work, the remediation of Zn-contaminated water using fly ash and Tonsil was studied. Both materials are considered low-cost sorbents since they are a byproduct of an industrial process, or locally abundant in nature. To increase the Zn uptake, the materials were activated by applying ultrasonic energy. It was found that the pH is an important parameter to be controlled since the larger sorption capacity occurred at pH = 4. Also, the materials activated with ultrasound were able to adsorb greater Zn quantities at the studied experimental conditions. Finally, the kinetics of the adsorption process was analyzed, and several mathematical models were proposed to simulate the experimental data. After making some statistical discrimination, the Lagergren model was selected to represent the sorption of Zn on the different materials studied.

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Effect of sonication on the particle size of montmorillonite clays

Cited by 89 publications

References 25 publications

Release of surfactants from organo-modified montmorillonite into solvents: Implications for polymer nanocomposites

Release of surfactants from organo-modified montmorillonite into solvents: Implications for polymer nanocomposites

Morphology, Structure, Thermal Stability, XR-Diffraction, and Infrared Study of Hexadecyltrimethylammonium Bromide–Modified Smectite

Kinetics Studies on the Process of Zn Removal from Wastewater Using Ultrasonically Activated Sorbents

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