Influence of Acid Activation on Natural Calcium Montmorillonite Clay

Sharma, Soniya; Sarasan, Geetha

doi:10.9790/5736-1006027177

Cited by 11 publications

(3 citation statements)

References 14 publications

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“…This indicates the release of Al 3+ , Mg 2+ and Fe 3+ cations from the octahedral sheets. The obtained results accord well with those in the previous studies 27–47 and confirm the chemical found analyses.…”

Section: Resultssupporting

confidence: 92%

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Decolorization of soybean oil by acid‐activated Ca‐Bentonite (EL Gnater, Central Tunisia)

Chakroun

Sghaier

Gaied

2022

Env Prog and Sustain Energy

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In the central Atlas of Tunisia, numerous outcrops of the upper Eocene provide smectitic clays. A representative sample (A) which was collected from the El Gnater region round El Ala underwent mineralogical and physicochemical analyses (granulometry, DRX, BET, FT-IR, etc.). This clay showing percentage of the order of 80% in smectite were activated with hydrochloric acid to improve its physicochemical properties, and consequently to increase their decolorization power for soybean oils. The best results were obtained using clay, activated with 3 N hydrochloric acid for 3 h at 75 C (AA2). Indeed, the specific surface area increased from 44 to 119 m 2 /g. The characterization of physicochemical properties was carried out on the samples (A: raw, AA: activated at different acid concentrations 1.5, 3 and 4.5 N at 75 C during 3 h). Under optimal conditions, the decolorization power of AA2 clay (60.15%) was found to be better than that obtained by a bleaching earth imported from Germany (57.27%). These encouraging results allow the reduction or permanently stopping of these materials imports.

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Section: Resultssupporting

confidence: 92%

“…Thus, translating the destruction of the crystal lattice clay results in the formation of amorphous silica. A similar description was introduced by Sharma and Sarasan, 39 indicating that an acid concentration increased the appearance of the amorphous phase: the SiO 2 rate increased from 43.19 to 59.83%.…”

Section: Resultssupporting

confidence: 54%

Decolorization of soybean oil by acid‐activated Ca‐Bentonite (EL Gnater, Central Tunisia)

Chakroun

Sghaier

Gaied

2022

Env Prog and Sustain Energy

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“…A composition of smectite and illite, and the presence of a non-swellable mineral, such as quartz in the material, has the effect of decreasing the capability of clay to be intercalated with the polyoxocation of the precursor [ 127 ]. Pretreatments, including the demineralization of impurities through the addition of hydrogen peroxide, as well as refluxing the minerals in acid, were reported to be effective to increase the basal spacing, d 001 , of clay, along with the increased specific surface area [ 140 , 141 , 142 ]. Intensive studies on the effects of initial clay were also carried out for the synthesis of porous clay heterostructure [ 143 ].…”

Section: Clay Modificationsmentioning

confidence: 99%

Clay-Supported Metal Oxide Nanoparticles in Catalytic Advanced Oxidation Processes: A Review

et al. 2022

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Advanced oxidation processes (AOPs) utilizing heterogeneous catalysts have attracted great attention in the last decade. The use of solid catalysts, including metal and metal oxide nanoparticle support materials, exhibited better performance compared with the use of homogeneous catalysts, which is mainly related to their stability in hostile environments and recyclability and reusability. Various solid supports have been reported to enhance the performance of metal and metal oxide catalysts for AOPs; undoubtedly, the utilization of clay as a support is the priority under consideration and has received intensive interest. This review provides up-to-date progress on the synthesis, features, and future perspectives of clay-supported metal and metal oxide for AOPs. The methods and characteristics of metal and metal oxide incorporated into the clay structure are strongly influenced by various factors in the synthesis, including the kind of clay mineral. In addition, the benefits of nanomaterials from a green chemistry perspective are key aspects for their further considerations in various applications. Special emphasis is given to the basic schemes for clay modifications and role of clay supports for the enhanced mechanism of AOPs. The scaling-up issue is suggested for being studied to further applications at industrial scale.

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An efficient method to prepare high grafting montmorillonite with silane coupling agent and its improvements for styrene butadiene rubber composites

Peng,

Li,

Wang

et al. 2024

Polymer Composites

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The quantity of silane chemically bonded to the organoclay's surface significantly influences its dispersion within the polymer matrix, as well as the interfacial interaction. This research presents a groundbreaking method for enhancing the surface properties of montmorillonite (Mt) through the use of γ‐(methacryloxy) propyl trimethoxy silane (KH570) coupled with acid treatment, leading to increased grafting efficiency. Confirmed by FT‐IR, TGA, and XRD, the process effectively bonds organo‐silanes to Mt and achieves a high grafting level of 1.59 mequiv/g. Utilizing a latex compounding method, Mt/rubber nanocomposites are synthesized with thoroughly modified clay for peak performance. Dispersion and interfacial properties are evaluated through XRD, TEM, AFM, and DMTA. The findings reveal that the well‐modified Mt is an exceptional filler, ensuring a high level of dispersion and robust interaction with the rubber matrix. This synergy translates to a marked improvement in the mechanical properties of the composite, with notable enhancements observed in both tensile strength and elongation at break of 9.7 MPa and 1141%, respectively. This innovative approach to the graft modification of clays presents a potent method, offering the potential for the industrial‐scale manufacture of high‐performance clay‐based composites.Highlights A processing method for preparing high grafting clay with a silane coupling agent. Functionalized clay presents better nano‐dispersion in the polymeric matrix. Strong covalent interfacial interaction is constructed between clay and rubber. Tensile Strength and elongation at break of the composites are obliviously improved.

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Influence of Acid Activation on Natural Calcium Montmorillonite Clay

Cited by 11 publications

References 14 publications

Decolorization of soybean oil by acid‐activated Ca‐Bentonite (EL Gnater, Central Tunisia)

Decolorization of soybean oil by acid‐activated Ca‐Bentonite (EL Gnater, Central Tunisia)

Clay-Supported Metal Oxide Nanoparticles in Catalytic Advanced Oxidation Processes: A Review

An efficient method to prepare high grafting montmorillonite with silane coupling agent and its improvements for styrene butadiene rubber composites

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