Intercalation of hydrophilic antibiotic into the interlayer space of the layered silicate magadiite

Mokhtar, Adel; Djelad, Amal; Adjdir, Mehdi; Zahraoui, Mehdi; Bengueddach, Abdelkader; Sassi, Mohamed

doi:10.1016/j.molstruc.2018.06.014

Cited by 19 publications

(18 citation statements)

References 38 publications

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“…A weak third mass step of 1.2%, at temperatures above 200 °C, was assigned to the dehydroxylation of the silicate layers that occurred at a maximum temperature of 288 °C ( Figure 7 A). This feature was similar to that reported for the magadiite materials [ 3 , 4 , 39 ].…”

Section: Resultssupporting

confidence: 90%

“…The negative charge is balanced by exchangeable hydrated cations, such as Na + or protons (H + ), in the interlayer spacing [ 3 ]. The magadiite exhibited a theoretical high cation exchange capacity (CEC) of nearly 200 meq/100 g [ 4 ], resulting in good ion exchange properties as a host for many organic and inorganic cations [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Magadiite was used as a silica precursor to prepare some new microporous zeolite materials with unique structures and properties using small organic templates [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

et al. 2018

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Na-magadiite exchanged with cetyl-trimethylammonium cations provided organophilic silicate materials that allowed for the effective removal of the acidic dye “eosin”. The organic cations were intercalated into the interlayer spacing of the layered silicate via an exchange reaction between the organic cations from their bromide salt and the solid Na-magadiite at room temperature. Different techniques were used to characterize the effect of the initial concentration of the surfactant on the structure of the organo-magadiites. The C, H, and N analysis indicated that a maximum of organic cations of 0.97 mmol/g was achieved and was accompanied by an expansion of the basal spacing of 3.08 nm, with a tilted angle of 59° to the silicate layers. The conformation of the organic surfactants was probed using solid-state 13C, finding mainly the trans conformation similar to that of the starting cetyl trimethylammonium bromide salt (C16TMABr). Thermal gravimetric analysis was carried out to study the thermal stability of the resulting organo-magadiites. The intercalated surfactants started to decompose at 200 °C, with a mass loss percentage of 8% to 25%, depending on the initial loading of the surfactant, and was accompanied by a decrease of the basal spacing from 3.16 nm to 2.51 nm, as deduced from the in situ X-ray diffraction studies. At temperatures below 220 °C, an expansion of the basal spacing from 3.15 to 3.34 nm occurred. These materials were used as a removal agent for the anionic dye eosin. The maximum amount of the dye removed was related to the organic cation content and to the initial concentration of eosin, with an improvement from 2.5 mg/g to 80.65 mg/g. This value decreased when the organo-magadiite was preheated at temperatures above 200 °C. The regeneration tests indicated that an 85% removal efficiency was maintained after six cycles of use for the organo-magadiite using Ci of 200 mg/L.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

et al. 2018

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“…A weak third mass step of 1.2 %, at temperatures above 200 °C, was assigned to the dehydroxylation of the silicate layers that occurred at a maximum temperature of 280 °C ( Figure 5(A)). This feature was similar to that reported for the magadiite materials [4,3,36].…”

Section: Thermal Gravimetric Analysis (Tga)supporting

confidence: 90%

“…The negative charge is balanced by exchangeable hydrated cations such Na + or protons (H + ) in the interlayer spacing [3]. The magadiite exhibited a theoretical high cation exchange capacity of nearly 200 meq/ 100 gr [4], resulting in good ion exchange properties as a host for many organic and inorganic cations [5,6,7,8, 9 10, 11]. Magadiite was used as a silica precursor to prepare some new microporous zeolite materials with unique structures and properties using small organic templates [12,13].…”

Section: Introductionmentioning

confidence: 99%

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Kooli¹,

Liu²,

Abouddi³

et al. 2018

Preprint

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Na-magadiite exchanged with cetyl-trimethylammonium cations provided organophilic silicate materials that allowed the effective removal of the acidic dye "eosin". The organic cations were intercalated into the interlayer spacing of the layered silicate via an exchange reaction between the organic cations from their bromide salt and the solid Na-magadiite at room temperature. Different techniques were used to characterize the effect of the initial concentration of the surfactant on the structure of the organo-magadiites. The C, H, N analysis indicated that a maximum of 2 organic cations of 1.03 mmol/g was achieved at initial concentrations higher than 0.25 mmol/g and was accompanied by an expansion of the basal spacing of 3.15 nm, with a tilted angle of 64.5° to the silicate layers. The conformation of the organic surfactants was probed using solid-state 13 C, finding mainly the trans conformation similar to that of the starting cetyl trimethylammonium bromide salt (C16TMABr).Thermal gravimetric analysis was carried out to study the thermal stability of the resulting organo-magadiites. The intercalated surfactants started to decompose at 200 °C, with a mass loss percentage of 8 % to 25 %, depending on the initial loading of the surfactant, and was accompanied by a decrease of the basal spacing from 3.20 nm to 2.51 nm, as deduced from the in situ X-ray diffraction studies. At temperatures below 220 °C, an expansion of the basal spacing from 3.15 to 3.35 nm occurred.These materials were used as a removal agent for the anionic dye "eosin". The maximum amount of the dye removed was related to the organic cation content and to the initial concentration of eosin, with an improvement from 2.5 mg/g to 98 mg/g. This value decreased when the organo-magadiite was preheated at temperatures above 200 °C. The regeneration tests indicated that an 85 % removal efficiency was maintained after 6 cycles of use for the organo-magadiites.

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“…Layered chemical compositions are attractive materials for a variety of industrial applications, including catalysts, lubricants, batteries, electrical devices, insulation, and building materials. − Taking advantage of layered chemical compositions, such as their ion carrying capacity, ionic substitution ability, and controlled release property based on their specific crystal structure, has recently resulted in these layered compositions receiving more attention as adsorbing and antibacterial materials. ,− Silicate materials such as muscovite, montmorillonite, vermiculite, and imogolite, which are categorized as clay minerals, have been used primarily for these types of applications. − A layered calcium phosphate composition, octacalcium phosphate [OCP: Ca 8 (HPO 4 ) 2 (PO 4 ) 4 ·5H 2 O], has recently been introduced as an attractive material for these applications because it has not only these advanced properties that silicate minerals have but also excellent biocompatibility because it is the primary inorganic component in vertebrate hard tissue. − …”

Section: Introductionmentioning

confidence: 99%

Effect of the Ionic Radius of Alkali Metal Ions on Octacalcium Phosphate Formation via Different Substitution Modes

Sugiura

Saito

Endo

et al. 2019

Crystal Growth & Design

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Octacalcium phosphate (OCP), a layered calcium phosphate compound, is an attractive material for new medical combination products, which are hybrid materials consisting of both drugs and biomaterials that have shown excellent therapy scores. OCP is fabricated primarily from soluble calcium salt via an aqueous-mediated hydrolysis process. The coexisting cations are likely to be incorporated into the OCP unit lattice during this process and affect the development of the OCP crystal structure and its thermodynamic stability. However, the key parameters of the coexisting cations, such as the ionic radii and charge number, that affect OCP formation are still unclear. In this study, we focused on the ionic radius of each monovalent ion of alkali metal ions (Li + , Na + , K + , Rb + , and Cs + ) for OCP incorporation and formation in a CaHPO 4 •2H 2 O (DCPD)-(NH 4 ) 2 HPO 4 system with alkali metal salts. There was little incorporation of Li into the OCP unit lattice at low concentrations, whereas Li was incorporated into the OCP unit lattice as a conjugate form of NH 4 and K, which have ionic radii that are larger than that of Ca, resulting in a HPO 4 −OH layered structure in the OCP unit lattice. The Na concentration increased hyperbolically and was incorporated into the OCP unit lattice, resulting in a HPO 4 −OH layered structure in the OCP unit lattice. By contrast, Li, K, and Rb resulted in the HPO 4 −OH layer in the OCP unit lattice at low concentrations and attenuated OCP formation at high concentrations. Cs only exhibited an attenuation effect on OCP formation. Considering the differences between the Ca ionic radius (1.00 Å) and those of alkali metal ions, the alkali metal ionic radii that were smaller than ∼1.5 times the Ca ionic radius could be incorporated into the OCP unit lattice, whereas those greater than ∼1.5 times the Ca ionic radius exhibited an inhibiting effect on OCP formation. In addition, Na particularly affects the OCP formation and its crystallinity unlike other alkali metal ions because of its similar ionic radius to Ca.

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Intercalation of hydrophilic antibiotic into the interlayer space of the layered silicate magadiite

Cited by 19 publications

References 38 publications

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Effect of the Ionic Radius of Alkali Metal Ions on Octacalcium Phosphate Formation via Different Substitution Modes

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