Synthesis, Characterization and Functionalization of McM-41 for the Removal of Organic Compounds From Wastewaters

Orbeci, Cristina; Stanescu, Rodica; Negoescu, Daniela; Pârvulescu, Viorica

doi:10.30638/eemj.2017.056

Cited by 4 publications

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“…After the modification of the silica with the aminopropyl groups, the external hydrophilic surface is changed into a hydrophobic surface. This treatment can reduce silica–silica interactions and promote silica–polymer interactions, producing a composite with well-dispersed mesoporous silica in the polysulfone matrix (Kim and Marand, 2008; Orbeci et al, 2017). The SEM images of the membranes with functionalized silica filler (Figure 9) revealed a good dispersion of the MCM-41-NH 2 particles through the polymeric matrix as well for the 20 wt%— shown in Figures 9e,f—due to amino groups, which prevent the formation of hydrogen bonds.…”

Section: Resultsmentioning

confidence: 99%

High Selective Mixed Membranes Based on Mesoporous MCM-41 and MCM-41-NH2 Particles in a Polysulfone Matrix

et al. 2019

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The development of membrane technology for gas separation processes evolved with the fabrication of so-called mixed matrix membranes (MMMs) as an alternative to neat polymers, in order to improve the overall membrane effectiveness. Once the mixed matrix membranes are used, the gas separation properties of the porous materials used as fillers are combined with the economical processability and desirable mechanical properties of polymer matrix. Mixed mesoporous silica/polymer membranes with high CO 2 and O 2 permeability and selectivity were designed and prepared by incorporating MCM-41 particles into a polymer matrix. Ordered mesoporous silica MCM-41 with high surface confirmed by BET analysis were obtained and functionalized with amino groups. In order to obtain the mixed membranes, the mesoporous silica was embedded into the polysulfone matrix (PSF). Flat mixed matrix membranes with 5, 10, and 20 wt% MCM-41 and MCM-41-NH 2 loadings have been prepared via the polymer solution casting method. The phase's interactions were studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR) and thermogravimetry (TGA), while the gas separation performances were evaluated using pure gases (CO 2 , O 2 , N 2 ). The MCM-41/PSF and MCM-41-NH 2 /PSF membranes exhibited increased permeabilities for O 2 (between 1.2 and 1.7 Barrer) and CO 2 (between 4.2 and 8.1 Barrer) compared to the neat membrane (0.8 Barrer). The loss of selectivity for the O 2 /N 2 (between 6 and 8%) and CO 2 /N 2 (between 25 and 41%) gas pairs was not significant compared with the pure membrane (8 and 39%, respectively). The MCM-41/PSF membranes were more selective for CO 2 /N 2 than the O 2 /N 2 pair, due to the size difference between CO 2 and N 2 molecules and to the condensability of CO 2 , leading to an increase of solubility. Stronger interactions have been noticed for MCM-41-NH 2 /PSF membranes due to the amino groups, with the selectivity increasing for both gas pairs compared with the MCM-41/PSF membranes.

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Section: Resultsmentioning

confidence: 99%

High Selective Mixed Membranes Based on Mesoporous MCM-41 and MCM-41-NH2 Particles in a Polysulfone Matrix

et al. 2019

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“…The presence of redox couple Ce 4+/ Ce 3+ exchaged the surface oxygen vacancies that could be transformed in oxygen radicals with formation of superoxide radicals. Many other photocatalysts were obtained by immobilization of the photoactive transition metals on various mesoporous silica supports, and their activity was evaluated in oxidation of organic polutants from water as dyes, functionalized 8-hydroxyquinolinate, antibiotics [9,10,28,56]. In all of these, the active photoactive metallic sites were Ti 4+ , Co 2+ , Fe 3+ , Al 3+ , Zn 2+ , Eu 3+ , Tb 3+ , Er 3+ , Nd 3+ with various dispersion on MCM-41, SBA-15 or hierarchical silica supports.…”

Section: Incorporated Metal Active Sites With Redox Propertiesmentioning

confidence: 99%

Catalytic Behavior of Metal Active Sites From Modified Mesoporous Silicas in Oxidation of Organic Compounds

Pârvulescu¹

2020

Redox

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The ordered mesoporous silicas containing transition metals are versatile catalytic materials for oxidation of a wide range of organic compounds. In order to obtain active catalysts, different active redox metal sites have been introduced into specific locations (mesoporous channels and framework) of ordered mesoporous silicas (OMSs). All the reported results evidenced that localization of metal ions, their interaction with another metal (bimetallic catalysts) and the support, with typical properties of the ordered mesoporous silica, influenced the oxidation state, respectively their redox properties. To support this, the results regarding the specific properties of transitional metals in the ordered structure of silica, obtained using various characterization methods, were presented. The activity of metal sites in the oxidation reactions was evidenced in various applications carried out in the liquid or gaseous phase. The oxidation of various organic compounds in liquid phase with H 2 O 2 (especially aromatic compounds and of alcohols) and in gas phase with oxygen from air was presented for a variety of metal-modified OMSs. The active sites and possible reaction mechanisms were presented for some catalytic systems. The immobilization of multiple metal active species on new ordered porous frameworks and their synergistic interactions remain topics of interest in the future.

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“…[64], MCM-41-Ti[65], SBA-15[66], LP-Ia3d[67] Broad-spectrum macrolide Ecomplex −315.45 kJ/mol Mw MCM-41 host matrix is essentially composed of negative formal charges; in drugs, red represents negative formal charges while the blue color represents positive formal charges, as shown in the electrostatic potential color scale:…”

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“…[64], MCM-41-Ti[65], SBA-15[66], LP-Ia3d[67] Broad-spectrum macrolide Pharmaceutics 2021, 13, x 7 of Summary of selected representative antibiotics that have been hosted into different pure-silica mesoporous matrices for controlled delivery proposes. Results derived from molecular modelling and docking studies of MCM-41-antibiotic host-guest interactions, carried out using Hex 8.0 software, are also shown (unpublished data) [64],.…”

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“…Results derived from molecular modelling and docking studies of MCM-41-antibiotic host-guest interactions, carried out using Hex 8.0 software, are also shown (unpublished data) [64],. MCM-41-Ti[65], SBA-15[66],LP-Ia3d [67] Broad-spectrum macrolide Ecomplex −315.45 kJ/mol Mw MCM-41 host matrix is essentially composed of negative formal charges; in drugs, red represents negative formal charges while the blue color represents positive formal charges, as shown in the electrostatic potential color scale:…”

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Nanoantibiotics Based in Mesoporous Silica Nanoparticles: New Formulations for Bacterial Infection Treatment

et al. 2021

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This review focuses on the design of mesoporous silica nanoparticles for infection treatment. Written within a general context of contributions in the field, this manuscript highlights the major scientific achievements accomplished by professor Vallet-Regí’s research group in the field of silica-based mesoporous materials for drug delivery. The aim is to bring out her pivotal role on the envisage of a new era of nanoantibiotics by using a deep knowledge on mesoporous materials as drug delivery systems and by applying cutting-edge technologies to design and engineer advanced nanoweapons to fight infection. This review has been divided in two main sections: the first part overviews the influence of the textural and chemical properties of silica-based mesoporous materials on the loading and release of antibiotic molecules, depending on the host–guest interactions. Furthermore, this section also remarks on the potential of molecular modelling in the design and comprehension of the performance of these release systems. The second part describes the more recent advances in the use of mesoporous silica nanoparticles as versatile nanoplatforms for the development of novel targeted and stimuli-responsive antimicrobial nanoformulations for future application in personalized infection therapies.

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Synthesis, Characterization and Functionalization of McM-41 for the Removal of Organic Compounds From Wastewaters

Cited by 4 publications

References 0 publications

High Selective Mixed Membranes Based on Mesoporous MCM-41 and MCM-41-NH2 Particles in a Polysulfone Matrix

High Selective Mixed Membranes Based on Mesoporous MCM-41 and MCM-41-NH2 Particles in a Polysulfone Matrix

Catalytic Behavior of Metal Active Sites From Modified Mesoporous Silicas in Oxidation of Organic Compounds

Nanoantibiotics Based in Mesoporous Silica Nanoparticles: New Formulations for Bacterial Infection Treatment

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