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Microporous and mesoporous materials
Elsevier Science BV
Microporous and mesoporous materials

Elsevier Science BV

1387-1811

Microporous and mesoporous materials/Journal Microporous and mesoporous materialsISTPCCREISCI
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    Functional mesoporous silica decorated with Ag nanoparticles as chemo-photothermal agents

    Antonia Millena de Oliveira LimaElizangela Hafemann FragalBarbara Sthefani Caldas
    12页
    查看更多>>摘要：This work reports the synthesis,characterization,and evaluation of the photothermal effect of silica-based mesoporous materials(SBA-15),functionalized and decorated with silver nanoparticles(AgNP)for photothermal analysis and drug delivery applications.The synthesis of SBA-15 occurred by the hydrothermal method following functionalization with APTS amino silanes,resulting in the SBA15-NH2 sample.The AgNP were synthesized by reduction method,using hemiaminal groups on the surface of SBA15-NH2 modifiers as reduction agents(SBA15-xAg with x = 4,and 10 mM of AgN03).FTIR,XRD,N2 Sorption,SEM,TEM,zeta potential,diffuse reflectance,and UV-Vis spectroscopy characterized the materials.The samples were explored in applications such as photothermal agents and drug delivery.The photothermal analysis showed temperature variations above 22 ℃.Besides,most suspensions prepared exhibit good photothermal stability.These features indicate that materials are promising as photothermal agents.The release tests indicated that only the SBA15-4Ag sample showed an increasing trend in curcumin release after being exposed to a 785 nm laser.It confirms that the smaller amount of silver nanospheres in the aforementioned sample was more effective in propagating the heat.Therefore,the results showed promising materials as nano heaters,especially the SBA15-4 Ag sample,which presents the good formation of silver nanorods,high heat degree,high photothermal efficiency values(η),and time-dependent.
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    • NSTL

    A microporous 2D cobalt-based MOF with pyridyl sites and open metal sites for selective adsorption of CO2

    Liang QinYan LiFenglan Liang
    8页
    查看更多>>摘要：A new microporous 2D Co-based MOF,[Co3(C6H3NO2)2(cpna)2(DMA)2]n(1)(H2cpna = 6-(4-carboxylphenyl)nicotinic acid; DMA = N,N-dimethylacetamide),has been synthesized and structurally characterized.Complex 1 shows a 2D network with ID channel of 6.4 × 9.3 A2 along the a-axis.Activated 1(1a)exhibits selective gas adsorption for CO2 as compared to other gas molecules(e.g.C2H2,CH4,CO,N2)from the experimental single-component gas-adsorption isotherm(at 273K and 298K),molecular simulation and breakthrough experiments(298K).And the adsorption selectivity(CO2/C2H2,CO2/CH4,CO2/C0,and CO2/N2)was calculated with the ideal adsorbed solution theory(IAST).Activated 1 shows 9.77 wt%(2.22 mmol/g)uptake of CO2 at 1 bar and 273 K.Furthermore,the activation of 1 exhibits high ideal selectivities in adsorption of CO2 over C2H2,CH4,CO,and N2 at 298 K(1 bar),which may be attributed to the pyridyl sites on the ligands and open metal sites on the nodes of the framework.Besides,la could adsorb more gas molecules due to thicker layer(10.97 A)of 2D structure.
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    Novel magnetic covalent organic framework loaded ligand for rapid removal and selective detection of mercury(II)from water

    Chengyue YangGongshu WangFeng Chen
    10页
    查看更多>>摘要：The present work aimed to prepare a novel magnetic covalent organic framework loaded ligand(MCM),which is going to be utilized to obtain efficient adsorption,rapid removal,and detection with high selectivity and sensitivity for mercury(II)ions.The structure,morphology,adsorption behavior,and detection properties of MCM were characterized with FTIR,TG,XRD,BET,SEM,TEM,UV-VIS,and XPS.To optimize the effects of process parameters,the influence of pH,contact time,and initial concentration on the adsorption behavior,color optimization,and detection limit of the mercury(II)ions was investigated.Under the optimal condition,MCM showed the efficient adsorption ability,rapid removal rate,high selectivity,and detection with excellent sensitivity for the mercury(II)ions.The color of MCM changed from light grey to yellow by observing with naked-eye in the presence of the mercury(II)ions,and the corresponding detection limit was 0.01 pg/L.MCM also has a high removal rate of mercury(II)ions in industrial wastewater,which can meet the industrial discharge standard(residual concentration of mercury(II)ions in the solution is 0.05 mg/L).What's more,MCM could be used in a portable column unit to separate mercury(II)ions from actual water samples,rapidly reducing the mercury(II)concentration from 10.0 mg/L to 10.0 |ig/L within 15 s.Kinetic studies showed that the MCM adsorption behavior for mercury(II)ions was in good agreement with the pseudo-second-order model,and the MCM adsorption equilibrium data for mercury(II)ions belonged to the Langmuir model.Furthermore,the adsorption amount of MCM for mercury(II)ions after five adsorptions was 96.89% of the adsorption amount of MCM for the first adsorption of mercury(II)ions,which showed that MCM has good regeneration ability.Consequently,MCM provided an excellent alternative to mercury(II)ions adsorption or enrichment materials,and this method showed great potential in the routine monitoring of trace mercury(II)ions in liquid substrates.
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    Hollow SAPO-34 incorporated mixed matrix membranes with the improved solubility selectivity and permeability for N2/CH4 separation

    Xiaoli DingYongfu TangHongyong Zhao
    11页
    查看更多>>摘要：Hollow SAPO-34 with an average particle size of ca.370 nm was synthesized by selective etching its precursor under the controlled alkaline condition.Subsequently,freestanding mixed matrix membranes were synthesized by UV-induced in-situ polymerization of the mixture of hollow SAPO-34,the fluorinated monomer,and the trifunctional cross-linker.The structure and the physical characteristic of hollow SAPO-34 and membranes were characterized by scan electron microscope,wide-angle X-ray diffraction,etc.The effect of the hollow SAPO-34 loading amount on the gas permeation-separation performance of mixed matrix membranes was investigated.The results showed that hollowing out SAPO-34 improved the N2/CH4 sorption selectivity and converted the crystals from preferential adsorption of N2 to preferential adsorption of CH4,the incorporation of hollow SAPO-34 into membranes increased the N2/CH4 solubility selectivity and the permeability.The optimal membrane exhibited a 39-fold increase in N2 permeability from 6.9 × 10~(-13)to 2.7 × 10~(-11)cm~3(STP)cm·cm~(-2)·s~(-1)·Pa~(-1)at 0.2 MPa and 35 ℃ without the loss of N2/CH4 permselectivity,which exceeded the 2008 Robeson upper bound.
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    • NSTL

    Thermal and structural stability of microporous natural clinoptilolite zeolite

    Radovan KukobatRanko SkrbicPascale Massiani
    7页
    查看更多>>摘要：Thermal treatment of zeolites prior to their use as adsorbents is needed to remove adsorbed water from zeolite pores,increasing porosity and surface area without inducing structural deterioration.Here,natural zeolite clinoptilolite(CLI)was thermally treated at 378-1073 K in air atmosphere.Porosity and structural changes after treatments at particular temperatures were investigated with N2 adsorption at 77 K,Fourier transform infrared(FTIR)spectroscopy and X-ray diffraction(XRD).Brunauer,Emmett and Teller(BET)surface area reached 60 m~2 g~(-1)and αS surface area reached 80 m~2 g~(-1)after thermal treatment at 473 K due to the evolution of water as evidenced with FTIR spectroscopy.Monoclinic crystal structure of the CLI zeolite was preserved after thermal treatment at ~873 K as indicated with XRD analysis.The CLI zeolite are structurally stable at ~873 K,reaching the highest specific surface area at 473 K,thus being promising for future adsorbent applications.
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    Effect of mesoporous silica@nano-bioactive glass complex particles on the durability of dentin bonding

    Ran YouHaowen QiChen Chen
    10页
    查看更多>>摘要：This study introduced a process for synthesizing mesoporous silicon@nano-bioactive glass(nano-BAG)complex particles,and evaluated their effects on dentin bonding and remineralizing activity.Mesoporous and nonporous silica microspheres were coated with nano-BAG via a quick alkali-mediated sol-gel method at different pH values(4,7,9).The eight groups of particles were examined by X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,nitrogen adsorption tests,scanning electron microscopy(SEM),and transmission electron microscopy(TEM).Inductively coupled plasma optical emission spectrometry(ICP-OES)was employed to record the cumulative release of Ca~(2+)at 7,14,and 28 days.The ability to promote the formation of hydroxyapatite was assessed by mineralization tests.The CCK-8 cell counting kit was used to test the cytotoxicity.Microtensile bond strength(μTBS)tests nanoleakage and were carried out to evaluate the effects of a pretreatment using mesoporous or nonporous silica microspheres coated with nano-BAG.XRD and FTIR analyses confirmed that nano-BAG coated mesoporous silica and formed a relatively ordered mesoporous structure,whereas nonporous silica did not exhibit major structural changes.In N2 adsorption tests,the specific surface area and pore volume of mesoporous silica(927.04 m~2/g; 0.77 cm~3/g)were much larger than those of silica(10.76 m~2/g; 0.04 cm~3/g).Both SEM and TEM revealed a greater homogeneity and dispersity in mesoporous silica coated with nano-BAG at pH 4.This kind of particles maintained a high level of cumulative release of Ca~(2+)(178.29 ± 0.950 mg/L at 28 days),showed the strongest Ca and P signal intensity after being immersed in SBF for 28 days,and exhibited higher μTBS values(41.56 ± 3.110 MPa)and minimal nanoleakage.Cytotoxicity tests indicated a well-preserved cell viability in these particles.Nano-BAG-coated mesoporous silica particles,obtained at pH 4,provided a stable release of Ca~(2+)in body fluid,and showed a strong ability to promote the formation of hydroxyapatite.These features are beneficial for enhancing the resin-dentin bonding and reducing nanoleakage.
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    Tailoring of mesoporous bioactive glass composite scaffold via thermal extrusion based 3D bioprinting and scrutiny on bone tissue engineering characteristics

    Shubham PantSesha SubramanianSabu Thomas
    15页
    查看更多>>摘要：In the recent years,mesoporous bioactive glass(MBG)based 3D printed scaffolds have been envisaged widely for bone tissue engineering potential.The earlier reports on 3D printed MBG based scaffolds for bone tissue engineering application are dedicated to pneumatic extrusion,which involves utilization of solvent and tedious process steps for preparation of bio ink.In order to overcome these limitations,the current work aims to develop 3D printed MBG based biomimetic composite scaffold via thermal extrusion process,which is devoid from solvent.It is well known that it is highly challenging to process pure MBG based inorganic/ceramic materials into 3D printed constructs due to lack of flexibility.Therefore,poly(caprolactone)(PCL)which exhibits bio inert nature towards formation of hydroxyapatite is used as the binder in order to impart flexibility during thermal extrusion process.The novelty of the current work lies in optimization of 3D printing parameters in order to fabricate MBG/PCL based composite construct,which mimics the natural bone composition with inorganic to organic ratio of 70:30 with hierarchical pore architecture and evaluation of its bone tissue engineering characteristics,which has not been documented earlier in the best of our knowledge.Through SBF studies,it is revealed that the 3D printed PCL/MBG composite scaffold helps in the formation of hydroxyapatite biomineral,which is lacking in the case of PCL scaffold.The presence of MBG in the PCL matrix is also found to support cellular proliferation and osteogenic differentiation,which is also reflected in terms of calcium mineralization and up regulation of osteogenic genes.This indicates that the 3D printed PCL/MBG composite scaffold mimicking the natural bone composition seems to hold promising potential for bone tissue engineering.
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    Metal-organic framework(UIO-66-NH2)-encapsulated peroxophosphotungstate(PW4)loaded on graphene oxide(GO)as catalyst for desulfurization of fuel

    Yan GaoMiao YanJianshe Zhao
    9页
    查看更多>>摘要：A composite PW4@UIO-66-NH2/GO was designed and prepared via facile in-situ synthesis method for catalytic oxidation desulfurization of fuel.The proper sizes(window size and pore size)of UIO-66-NH2 can effective sealing PW4 as monomolecular active component and prevent PW4 leaching during the reaction process.At the same time,the introduction of GO can improve the electron transfer of the catalyst.Characterization tests showed that the active component PW4 was successfully encapsulated with a loading amount of 0.19 mmol/g.The desulfurization results indicated that the PW4@UIO-66-NH2/GO has excellent catalytic activity,which can remove 99.9% sulfides in model fuel,and the activity did not decrease obviously after repeated use for ten times.The good activity and reusability of PW4@UIO-66-NH2/GO attributes to the introduction of GO and UIO-66-NH2.In addition,based on GC-MS and EPR results,a possible mechanism of desulfurization reaction was proposed.
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    Tailoring novel polymer/UTSA-16 hybrid aerogels for efficient CH4/CO2 separation

    Cesare AtzoriNatale G.PorcaroValentina Crocella
    10页
    查看更多>>摘要：A significant number of industrially relevant separation processes involves the removal of carbon dioxide(C02),as the purification of natural gas(CO2/CH4 separation).In this scenario,the development of new adsorbents with a real technological future for CO2 separation,i.e with a high separation efficiency,good mechanical properties and easy to handle,is of primary importance.In the present work,novel composite monolithic aerogels containing the UTSA-16 metal organic framework as the active phase and porous crystalline polymers(namely syndiotactic polystyrene and polyphenyloxide)as binders were successfully synthesized and fully characterized.The adsorption capacity of such novel aerogels towards CO2 and CH4 was tested at low pressure and variable temperature,allowing the evaluation of their CO2/CH4 selectivity.Microcalorimetric experiments provided the CO2 interaction energy and disclosed possible deformation-relaxation phenomena involving the polymeric matrix during gas adsorption.The new composites retain a very high CO2 adsorption capacity compared to the pristine UTSA-16(around 75% at 298 K and 1 bar)and have excellent CO2 capture performances in comparison to other types of supported/printed MOFs reported in the literature.The outstanding adsorption properties and the possibility to obtain monoliths with the desired size and shape and good mechanical stability make these new composites very good candidates for efficient CO2/CH4 separation processes.
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    Enhanced visible-light harvesting of triazine-based covalent organic frameworks by incorporating Fe~(III)-tannic acid complexes for high-efficiency photocatalysis

    Qinyi ChengXingcun HeXiaolu Guo
    8页
    查看更多>>摘要：Triazine-based covalent organic frameworks(COFs)have recently emerged as a new class of photocatalysts for visible-light-driven photocatalytic reactions.However,the optical absorption edge of triazine-based COFs is usually below 550 nm,resulting in inefficient photocatalytic performance.Herein,a novel Fe~(III)-tannic acid(Fe~(III)-TA)complexes evenly coating a triazine-based COF(Fe~(III)-TA@TTB-TTA)was prepared using a simple self-assembly process.The Fe~(III)-TA significantly enhanced the optical absorption of TTB-TTA,especially in the X>600 nm region.Consequently,the composite photocatalyst exhibited a higher photodegradation rate of methyl orange(MO),corresponding to a 14-fold enhancement,compared with the bare TTB-TTA.Moreover,the degradation rate was 372 times higher under>600 nm light illumination,indicating that the photocatalytic enhancement mechanism primarily came from the enhanced visible-light harvesting capacity of Fe~(III)-TA.This work offers a promising avenue for enhancing the visible-light absorption of triazine-based COFs and providing insights into the research of high-performance photocatalysts.
      原文链接:
    • NSTL