Mesoporous Cu-SBA-15 with highly ordered porous structure and its excellent CO2 adsorption capacity

Lakhi, Kripal S.; Singh, Gurwinder; Kim, Sungho; Baskar, Arun V.; Joseph, Stalin; Yang, Jae‐Hun; Ilbeygi, Hamid; Ruban, Sujanya J.; Vu, Van Tu

doi:10.1016/j.micromeso.2018.03.024

Cited by 45 publications

(20 citation statements)

References 36 publications

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“…Especially mesoporous silica nanoparticles (MSNs), due to the large surface-to-volume ratio, offer some advantages in many applications. MSNs exhibit an ordered porous structure [3] with high surface area (>1000 m 2 /g) and tunable pore size (2-10 nm) [4,5]. Ordered MSNs are often synthesized using TEOS (tetraetoxysilane) as a silica source and ionic (for e.g., MCM-41 systems) or non-ionic (for SBA-15 systems) surfactants governing inorganic-organic mesophase formation [6].…”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive Polymer Gating System on Mesoporous Shells of Silica Particles Serving as Smart Nanocontainers

2020

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Spherical silica nanoparticles with solid cores and mesoporous shells (SCMS) were decorated with thermoresponsive polymer brushes that were shown to serve as macromolecular valves to control loading and unloading of a model dye within the mesopores. Thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) brushes were grafted from the surfaces of both solid core (SC) and SCMS particles of similar size using surface-initiated atom transfer radical polymerization. Both systems based on porous (SCMS-PNIPAM) and nonporous (SC-PNIPAM) particles were characterized using cryo-TEM, thermogravimetry and elemental analysis to determine the structure and composition of the decorated nanoparticles. The grafted PNIPAM brushes were found to be responsive to temperature changes enabling temperature-controlled gating of the pores. The processes of loading and unloading in the obtained systems were examined using a model fluorescent dye—rhodamine 6G. Polymer brushes in SCMS-PNIPAM systems were shown to serve as molecular valves enabling significant adsorption (loading) of the dye inside the pores with respect to the SC-PNIPAM (no pores) and SCMS (no valves) systems. The effective unloading of the fluorescent cargo molecules from the decorated nanoparticles was achieved in a water/methanol solution. The obtained SCMS-PNIPAM particles may be used as smart nanocontainers or nanoreactors offering also facile isolation from the suspension due to the presence of dense cores.

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Section: Introductionmentioning

confidence: 99%

Thermoresponsive Polymer Gating System on Mesoporous Shells of Silica Particles Serving as Smart Nanocontainers

2020

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“…Figures 6A and 6B show the N 2 adsorption–desorption isotherms and the pore‐size distribution curves of different BANF aerogels, respectively. These isotherms are classified as Type IV with hysteresis loops, closely related to the occurrence of capillary condensation, 78,79 indicating mesoporosity. The surface areas were calculated using BET analysis, and the BET‐specific surface areas were found to range from 396 to 542 m 2 /g (Figure S5), which are larger than those of branched BANF aerogels gelled with water 38 .…”

Section: Resultsmentioning

confidence: 99%

Biomimetic nanoporous aerogels from branched aramid nanofibers combining high heat insulation and compressive strength

et al. 2021

SmartMat

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Materials combining efficient thermal insulation and high mechanical properties are needed in many areas of technology. Various aerogels provide a convenient design framework for thermal insulators, but they are often brittle. Furthermore, the spectrum of advanced properties is constantly expanding while requirements to the degree of control of the three-dimensional gel-forming network is constantly increasing. Here, we report on biomimetic aramid nanofibers aerogels with the structure replicating articular cartilage, prepared by supercritical drying of 3D networks held together by hydrogen bonds. Owing to the branching morphology of the nanofibers, the three-dimensional nanoscale networks with extensive percolation and high interconnectivity can be obtained. The aerogels showed high porosity with an average open pore size of 21.5 nm and correspondingly low specific density of 0.0081 g/cm 3. The aerogels also possess a high compressive strength of 825 kPa at a strain of 80%. Due to the unique aramid chemistry of the parent nanofibers, aramid aerogels combine low thermal conductivity of 0.026 W/m•K with high thermal stability up to 530°C, which is unusually high for polymeric and composite materials of any type, opening a broad range of applications from electronics to space travel.

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“…6(a) shows the mesoporous phase characteristics of pure SBA-15 and GO/SBA-15 samples obtained through low-angle XRD. The two samples showed XRD patterns corresponding to (100), (110), and (200) reflections, characteristics of SBA-15 with a hexagonally ordered mesoporous structure [37]. The XRD patterns of the pure SBA-15 and GO/SBA-15 were similar.…”

Section: Pore Structure Analysismentioning

confidence: 86%

Preparation of mesoporous graphene oxide/SBA-15 hybrid nanoparticles as a potential adsorbent for removal of cationic dyes

Liou¹,

Lin²

2019

Desalination and Water Treatment

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In this paper, mesoporous graphene oxide/SBA-15 nanocomposite was used as an adsorbent for removing cationic dyes from wastewater. Adsorption experiments tested the initial concentration of dye, calcination temperature, and pH of dye solution. The features of the composite were examined through X-ray diffractometry, field-emission scanning electron microscopy, transmission electron microscopy, Raman spectrometry, Fourier transform infrared spectrometer, and surface area analysis. The graphene oxide/SBA-15 samples possessed a high degree of oxidation that gave the composite an excellent adsorptive property toward dye. Higher solution pH and initial concentration of dye favored methylene blue adsorption. Adsorption capacity was highest at a calcination temperature of 550°C. Adsorption kinetics and isotherms were analyzed. The adsorption process was well fitted by the pseudo-second order kinetic model and Langmuir isotherm model. The mesoporous graphene oxide/SBA-15 composite is a promising material for removing aqueous organic pollutants.

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Mesoporous Cu-SBA-15 with highly ordered porous structure and its excellent CO2 adsorption capacity

Cited by 45 publications

References 36 publications

Thermoresponsive Polymer Gating System on Mesoporous Shells of Silica Particles Serving as Smart Nanocontainers

Thermoresponsive Polymer Gating System on Mesoporous Shells of Silica Particles Serving as Smart Nanocontainers

Biomimetic nanoporous aerogels from branched aramid nanofibers combining high heat insulation and compressive strength

Preparation of mesoporous graphene oxide/SBA-15 hybrid nanoparticles as a potential adsorbent for removal of cationic dyes

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