scholarly journals Porous Clay Heterostructure with Alginate Encapsulation for Toluene Removal

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 388
Author(s):  
Yeongkyun Son ◽  
Tae-Hyun Kim ◽  
Daekeun Kim ◽  
Yuhoon Hwang
Keyword(s):  
Thermal Stability ◽  
Porous Structure ◽  
Pore Size ◽  
Pore Volume ◽  
Weight Ratio ◽  
Atmospheric Temperature ◽  
Alginate Beads ◽  
Preparation Conditions ◽  
Porous Clay Heterostructure ◽  
Adsorption Desorption

A volatile organic compound adsorbent based on a porous clay heterostructure (PCH) with alginate biopolymer was successfully prepared. From N2 adsorption–desorption analysis, the specific surface area, pore volume, and pore size of bentonite were dramatically increased after introducing the porous structure. Following complexation with alginate (Alg-PCH), the pore volume and pore size were not significantly affected by pore structure. The thermal stability of Alg-PCH shows enhanced thermal stability compared to alginate and alginate beads. The morphology layered structure of Alg-PCH was carried out by transmission electron microscopy (TEM), suggesting the disorder and re-order of the c-axis layer stacking by porous structure and complexation with alginate, respectively, which was well-matched with X-ray diffraction results. To optimize the preparation of Alg-PCH, various reaction conditions (alginate, CaCl2 concentration, bead size, and weight ratio between alginate and PCH) were utilized. According to the toluene adsorption–desorption experiments, the preparation conditions for Alg-PCH were selected as a 2 mm extrusion tip, 0.5% of alginate, and 2% of CaCl2 solution with a 1:50 alginate:PCH weight ratio. Additionally, it shows 61.63 mg/g adsorption capacity with around 49% desorption efficacy under atmospheric temperature and pressure.

Immobilization of hemoglobin on stable mesoporous multilamellar silica vesicles and their activity and stability

2005 ◽  
Vol 20 (10) ◽  
pp. 2682-2690 ◽  
Author(s):  
Yufang Zhu ◽  
Weihua Shen ◽  
Xiaoping Dong ◽  
Jianlin Shi
Keyword(s):  
Thermal Stability ◽  
Pore Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Practical Applications ◽  
Silica Material ◽  
Transmission Electron ◽  
Mesoporous Support ◽  
Adsorption Desorption ◽  
Thermal Stability Of

A stable mesoporous multilamellar silica vesicle (MSV) was developed with a gallery pore size of about 14.0 nm. A simulative enzyme, hemoglobin (Hb), was immobilized on this newly developed MSV and a conventional mesoporous silica material SBA-15. The structures and the immobilization of Hb on the mesoporous supports were characterized with x-ray diffraction, transmission electron microscopy, N2 adsorption-desorption isotherms, Fourier transform infrared, ultraviolet-visible spectroscopy, and so forth. MSV is a promising support for immobilizing Hb due to its large pore size and high Hb immobilization capacity (up to 522 mg/g) compared to SBA-15 (236 mg/g). Less than 5% Hb was leached from Hb/MSV at pH 6.0. The activity study indicated that the immobilized Hb retained most peroxidase activity compared to free Hb. Thermal stability of the immobilized Hb was improved by the proctetive environment of MSV and SBA-15. Such an Hb-mesoporous support with high Hb immobilization capacity, high activity, and enhanced thermal stability will be attractive for practical applications.

scholarly journals Adsorptive removal of antibiotics from water using peanut shells from agricultural waste

RSC Advances ◽  
2018 ◽  
Vol 8 (24) ◽  
pp. 13546-13555 ◽  
Author(s):  
Rui Li ◽  
Yuling Zhang ◽  
Wenlei Chu ◽  
Zaixing Chen ◽  
Jiali Wang
Keyword(s):  
Porous Structure ◽  
Pore Size ◽  
Surface Area ◽  
Agricultural Waste ◽  
Adsorptive Removal ◽  
Peanut Shells ◽  
Desorption Isotherms ◽  
Adsorption Desorption

The porous structure of the materials was determined using the surface area and pore size analyzer (JW-BK132F) by N2 adsorption–desorption isotherms at 77 K.

Study on Surface Modification of Mesporous Silica SBA-15

2014 ◽  
Vol 490-491 ◽  
pp. 222-226
Author(s):  
Heng Wang ◽  
Chuan Bai Yu ◽  
Chun Wei
Keyword(s):  
Surface Modification ◽  
Reaction Time ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Coupling Agent ◽  
Pore Volume ◽  
Silane Coupling Agent ◽  
Mesoporous Structure ◽  
Silane Coupling ◽  
Adsorption Desorption

In this paper, the mesoporous silica SBA-15 surface was modified by using silane coupling agent KH-540. In order to investigate the best modification conditions, effects of KH-540 dosage, reaction time and temperature were studied. The modified mesoporous silica SBA-15 was characterized by TGA, FTIR, XRD and N2 adsorption-desorption etc. The best modification conditions were obtained as follows: KH-540 dosage is 0.5g, reaction temperature is 90°C and reaction time is 4 hours. The results showed that KH-540 is successfully grafted on the surface of SBA-15, the SBA-15-KH540 possess a well ordered hexagonal mesoporous structure. Compared with pure SBA-15, the surface area, the pore size and the pore volume of the SBA-15-KH540 are decreased slightly.

scholarly journals BIOTEMPLATED SYNTHESIS OF ALUMINA FIBRES BY CONTROLLED HYDROLYSIS OF SALT PRECURSOR

2018 ◽  
Vol 59 (5) ◽  
pp. 47
Author(s):  
Mikhail F. Butman ◽  
Nataliya E. Kochkina ◽  
Anastasiya E. Mikhaiylova ◽  
Nikolaiy L. Ovchinnikov ◽  
Alexander V. Knotko
Keyword(s):  
Light Scattering ◽  
Pore Size ◽  
Pore Volume ◽  
N2 Adsorption ◽  
X Ray ◽  
Cellulose Structure ◽  
Electrophoretic Light Scattering ◽  
Adsorption Desorption ◽  
Hydrolysis Of ◽  
Controlled Hydrolysis

Alumina fibres were obrained by impregnation of the cellulose biotemplate with precursor solutions in which the hydrolysis ratio [OH-]/[Al3+] is varied and in which different aluminium oligo- and polycations content. The biotemplates and alumina fibres were studied by X-ray, TG/DSC, electrophoretic light scattering, SEM, and N2 adsorption/desorption. It was shown that the infiltration with the precursor did not affect the cellulose structure. The possibility to vary the surface area, pore size and pore volume of the ceramic fibres by controlled hydrolysis of aluminum was demonstrated.

Influence of Wood Flour Additive on Porous Structure and Strength Properties of Moulded Alumina

2015 ◽  
Vol 670 ◽  
pp. 139-143 ◽  
Author(s):  
Tatiana Bugrova ◽  
Anastasia Tatarkina ◽  
Ilya Zhukov ◽  
Grigory Mamontov
Keyword(s):  
Low Temperature ◽  
Porous Structure ◽  
Pore Volume ◽  
Wood Flour ◽  
Catalyst Support ◽  
Strength Properties ◽  
Porous Catalyst ◽  
Preparation Conditions ◽  
Granule Strength ◽  
20 Nm

The moulded Al2O3 materials prepared by mixing of thermochemically activated aluminum trihydroxide (TCA ATH) with wood flour were proposed to be used as promising porous catalyst support for various processes. A series of Al2O3 supports with different wood flour loading (0, 2 and 5 %wt.) were studied by SEM, low-temperature N2 sorption, XRD, granule strength and water-absorbing capacity. It was shown that supports were characterized by porous structure with mesopore sizes of 2-20 nm and specific surface area of 159-186 m2/g. The increase of the amount of wood flour leads to increase of the share of pore volume with wider than 10 nm and the decrease of the strength of alumina granules. Thus, optimization of preparation conditions allows obtaining alumina materials with desired porous structure.

High-Temperature CO2 Capture Using MgO/γ-Al2O3 Materials as Adsorbent

2012 ◽  
Vol 476-478 ◽  
pp. 1811-1814 ◽  
Author(s):  
Xin Fu
Keyword(s):  
High Temperature ◽  
Pore Size ◽  
Pore Volume ◽  
Co2 Adsorption ◽  
In Situ Ftir ◽  
N2 Adsorption ◽  
Carbonate Species ◽  
Adsorption Desorption ◽  
Co2 Adsorbent

CO2 adsorbent, MgO/γ-Al2O3, was prepared by impregnation methods. The structure and surface properties of the prepared materials were characterized by XRD, N2 adsorption-desorption, in situ FIIR and CO2-TPD techniques. The results indicated that the surface area, pore size and pore volume of materials decreased with the introduction of MgO. Their capacity for CO2 adsorption could be significantly improved when the MgO loading increased from 0 to 10 wt %. CO2-TPD and in-situ FTIR showed that the materials have three basic sites which can react with CO2 to form bicarbonate, bidentate carbonate and monodentate carbonate species.

Mesopore silica effect on chemical, thermal and tribological properties of polyimide composites

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Bayram Poyraz ◽  
Hüseyin ÜNAL ◽  
Mustafa Dayı
Keyword(s):  
Thermal Stability ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Tribological Properties ◽  
Pore Volume ◽  
Chemical Characterization ◽  
Wear Properties ◽  
Morphological Alterations ◽  
Pin On Disc ◽  
Polyimide Composites

Abstract In this experimental study, the effects of mesoporous silica filler content on the chemical, thermal and tribological properties of polyimide composites were investigated. For that purpose, Pi/mesoporous silica composites were produced by in situ polymerization with various mesoporous silicas. After fabrication, thermal stability and chemical characterization were determined using TGA and FTIR. Morphological alterations were monitored with a scanning electron microscope (SEM). Texture structure (pore size and pore volume) were determined by the BJH method. Friction and wear properties were investigated by using a pin-on-disc arrangement. At the end of the study, minor shifts of Pi/mesoporous silica composites were observed. Thermal stability, as well as pore size and pore volume, was decreased with mesoporous silica. The coefficient of friction and specific wear rate decreased with the addition of mesoporous silica. Abrasive wear behaviors were seen for both neat Pi and Pi–Si composites. Hence, this study evidenced that the properties of Pi are influenced by mesoporous dimensions and content of Si employed.

Effect of the hydrophilicity of the polymer matrix on immobilized α-chymotrypsin

1984 ◽  
Vol 49 (6) ◽  
pp. 1552-1556
Author(s):  
Minoru Kumakura ◽  
Isso Kaetsu
Keyword(s):  
Thermal Stability ◽  
Enzyme Activity ◽  
Pore Size ◽  
Polymer Matrix ◽  
Low Temperatures ◽  
Radiation Polymerization ◽  
Thermal Stability Of

α-Chymotrypsin was immobilized by radiation polymerization at low temperatures and the effect of the hydrophilicity of the polymer matrix on the enzyme activity and thermal stability was studied. The activity and thermal stability of immobilized chymotrypsin increased with the increasing hydrophilicity of the polymer matrix or monomer. The thermal stability was affected by the form and pore size of the polymer matrix; chymotrypsin immobilized on a soft-gel polymer matrix exhibited an enhanced thermal stability.

The relationship between geotechnical index properties and the pore-size distribution of compacted clayey silts

2015 ◽  
Vol 22 (6) ◽  
Author(s):  
Nazile Ural
Keyword(s):  
Specific Surface ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Correlation Coefficients ◽  
Liquid Limit ◽  
Index Properties

AbstractIn this study, the relationships between geotechnical index properties and the pore-size distribution of compacted natural silt and artificial soil mixtures, namely, silt with two different clays and three different clay percentages (10%, 20%, and 40%), were examined and compared. Atterberg’s limit tests, standard compaction tests, mercury intrusion porosimetry, X-ray diffraction, scanning electron microscopy (SEM) analysis, and Brunauer-Emmett-Teller specific surface analysis were conducted. The results show that the liquid limit, the cumulative pore volume, and specific surface area of artificially mixed soils increase with an increase in the percentage of clay. The cumulative pore volume and specific surface area with geotechnical index properties were compared. High correlation coefficients were observed between the specific areas and both the liquid limit and the plasticity index, as well as between the cumulative pore volume and both the clay percentage and the

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