Surfactant recovery from mesoporous metal-modified materials (Sn–, Y–, Ce–, Si–MCM-41), by ultrasound assisted ion-exchange extraction and its re-use for a microwave in situ cheap and eco-friendly MCM-41 synthesis

Tovar-Rodriguez, Jorge; Bramanti, Emilia; Duce, Celia; Longo, I.; Fratini, Emiliano; Galindo-Esquivel, I. R.; Ferrari, C.

doi:10.1039/c3ta15078j

Cited by 23 publications

(20 citation statements)

References 37 publications

(55 reference statements)

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“…based on acid treatment) have been used for removing and, in some cases, recovering the compounds used as templates. [24][25][26][27] Soft templating methods can be subdivided into two groups: primary methods, in which the template and all other components of the synthesis mixture are added together; and secondary methods, in which first all components except the template are mixed, followed by addition of the template in a second, separate step. The first attempts to apply soft templating to the synthesis of zeolites with hierarchical porosity were based on combining a structure-directing agent for the synthesis of the zeolite and a surfactant for generating mesoporosity.…”

Section: Soft Templating Methodsmentioning

confidence: 99%

Modern Synthesis Routes to Hierarchically-Structured Porous Materials

Pescarmona¹

2021

Handbook of Porous Materials

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Section: Soft Templating Methodsmentioning

confidence: 99%

Modern Synthesis Routes to Hierarchically-Structured Porous Materials

Pescarmona¹

2021

Handbook of Porous Materials

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“…A novel scalable methodology based on coaxial MW technology inside standard laboratory equipment is used here for the synthesis optical microresonators based on polymer microspheres incorporating a laser dye. This configuration has been successfully used in several MW assisted chemical processes such as heterogeneous catalytic processes [47], nanoparticle syntheses [48,49], and mesoporous materials syntheses [50]. In this configuration, MW irradiation ensures a selective homogeneous heating of the reaction mixture.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted in situ laser dye incorporation into high sensitivity whispering gallery mode microresonators

Mondragón-Ochoa¹,

Toparlı²,

Khanum³

et al. 2021

J. Phys. D: Appl. Phys.

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Optical whispering gallery mode microresonators (WGM-µRs) are powerful sensitive components with many analytical applications. Here, spherical WGM-µRs have been synthesised in a single-step microwave (MW)-assisted heterophase polymerisation. The microresonators are based on poly(styrene) beads into which the organic lasing dye nile red was incorporated as gain medium in situ during the polymerisation. The particle diameter and diameter distribution of the synthesised particles were tuned in the range of around 200 nm up to 50 µm by adjusting the concentration between stabiliser poly-(N-vinyl pyrrolidone) (PVP) and monomer styrene, and the solvent composition in the dispersion process. Lower water content enabled the synthesis of spherical particles with large size polydispersity, from which WGM-µRs with a variety of diameters were selected. Microspheres with diameters ≳3.5 µm supported WGMs. The WGMs were excited through free space via the fluorescence of the laser dye. Pumping power levels <1 µW were sufficient to excite WGMs. WGM shifts of beads with diameter between ≈5 and 30 µm measured in air and water show a sensitivity up to 54 nm/RIU for the smallest particles. Dye doped WGM-µR in the low µm size range obtained by the

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“…This is a handicap for colloidal nanoparticles as the mass transport to the active sites can be greatly reduced. As a consequence, mild detemplation methods have been developed such as using oxidation agents (e.g., Fenton reagent) to remove the template [13,14], material equilibration, and drying in a low-surface tension solvent [15] and ultrasound-assisted ion-exchange process using primary alcohols as solvents [16]. The latter technique showed mesoporous materials (MCM-41) kept their hexagonal structure and high surface area after the surfactant extraction and was able to reduce the thermal shrinkage produced by the conventional calcination surfactant degradation.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges

et al. 2020

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We present here important new findings on the direct synthesis of bimetal Cu-Mn containing porous silica catalyst and the effects of structure-directing agent removal from the prepared nanomaterial on the evolution of surface catalytic sites. The extraction-calcination procedure of the structure-directing agent removal led to the formation of Cu and Mn oxo-clusters and Cu and Mn oxide nanoparticles smaller than 5 nm, while the solely calcination procedure led to the mentioned species and in addition to the appearance of CuO nanoparticles 20 nm in size. Catalysts were tested in the Fenton-like catalytic degradation of dyes with different molecular charge (cationic, anionic, and zwitterionic) as model organic pollutants in wastewater at neutral pH. Significantly faster degradation of cationic and anionic dyes in the first 60 min was observed with the catalyst containing larger CuO nanoparticles (>20 nm) due to the less hindered generation of •OH radicals and slower obstructing of the active sites on the catalysts surface by intermediates. However, this was not found beneficial for zwitterionic dye with no adsorption on the catalysts surface, where the catalyst with smaller Cu species performed better.

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Surfactant recovery from mesoporous metal-modified materials (Sn–, Y–, Ce–, Si–MCM-41), by ultrasound assisted ion-exchange extraction and its re-use for a microwave in situ cheap and eco-friendly MCM-41 synthesis

Abstract: Metal substituted (Y, Sn and Ce) MCM-41 materials were synthesized and detemplated by a low temperature methodology.

Cited by 23 publications

References 37 publications

Modern Synthesis Routes to Hierarchically-Structured Porous Materials

Modern Synthesis Routes to Hierarchically-Structured Porous Materials

Microwave-assisted in situ laser dye incorporation into high sensitivity whispering gallery mode microresonators

Evolution of Surface Catalytic Sites on Bimetal Silica-Based Fenton-Like Catalysts for Degradation of Dyes with Different Molecular Charges

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