scholarly journals Functionalized Mesoporous Silica Membranes for CO2Separation Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Hyung-Ju Kim ◽  
Hee-Chul Yang ◽  
Dong-Yong Chung ◽  
In-Hwan Yang ◽  
Yun Jung Choi ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Molecular Sieves ◽  
Three Dimensional ◽  
Molecular Transport ◽  
Advanced Materials ◽  
Silica Membranes ◽  
Surface Areas ◽  
Functionalized Mesoporous Silica ◽  
Potential Applications ◽  
And Performance

Mesoporous silica molecular sieves are emerging candidates for a number of potential applications involving adsorption and molecular transport due to their large surface areas, high pore volumes, and tunable pore sizes. Recently, several research groups have investigated the potential of functionalized mesoporous silica molecular sieves as advanced materials in separation devices, such as membranes. In particular, mesoporous silica with a two- or three-dimensional pore structure is one of the most promising types of molecular sieve materials for gas separation membranes. However, several important challenges must first be addressed regarding the successful fabrication of mesoporous silica membranes. First, a novel, high throughput process for the fabrication of continuous and defect-free mesoporous silica membranes is required. Second, functionalization of mesopores on membranes is desirable in order to impart selective properties. Finally, the separation characteristics and performance of functionalized mesoporous silica membranes must be further investigated. Herein, the synthesis, characterization, and applications of mesoporous silica membranes and functionalized mesoporous silica membranes are reviewed with a focus on CO2separation.

Robust transparent mesoporous silica membranes as matrices for colorimetric sensors

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16549-16553 ◽  
Author(s):  
Donghun Kim ◽  
Bradley F. Chmelka
Keyword(s):  
Heavy Metal ◽  
Mesoporous Silica ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Colorimetric Detection ◽  
High Surface ◽  
Silica Membranes ◽  
Surface Areas ◽  
Functionalized Mesoporous Silica ◽  
Colorimetric Sensors

Transparent functionalized mesoporous silica membranes have been prepared with high surface areas (∼500 m2 g−1) that exhibit high sensitivities for colorimetric detection and sensing of dilute heavy-metal ions (e.g., Pb2+).

scholarly journals A Review on Breathing Behaviors of Metal-Organic-Frameworks (MOFs) for Gas Adsorption

2021 ◽  
Author(s):  
Mays Alhamami ◽  
Huu Doan ◽  
Chil-Hung Cheng
Keyword(s):  
Molecular Sieves ◽  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Design Strategies ◽  
Surface Areas ◽  
Host Materials ◽  
Potential Applications ◽  
Metal Organic ◽  
Definition Of ◽  
Dynamics Simulations

Metal-organic frameworks (MOFs) are a new class of microporous materials that possess framework flexibility, large surface areas, “tailor-made” framework functionalities, and tunable pore sizes. These features empower MOFs superior performances and broader application spectra than those of zeolites and phosphine-based molecular sieves. In parallel with designing new structures and new chemistry of MOFs, the observation of unique breathing behaviors upon adsorption of gases or solvents stimulates their potential applications as host materials in gas storage for renewable energy. This has attracted intense research energy to understand the causes at the atomic level, using in situ X-ray diffraction, calorimetry, Fourier transform infrared spectroscopy, and molecular dynamics simulations. This article is developed in the following order: first to introduce the definition of MOFs and the observation of their framework flexibility. Second, synthesis routes of MOFs are summarized with the emphasis on the hydrothermal synthesis, owing to the environmental-benign and economically availability of water. Third, MOFs exhibiting breathing behaviors are summarized, followed by rationales from thermodynamic viewpoint. Subsequently, effects of various functionalities on breathing behaviors are appraised, including using post-synthetic modification routes. Finally, possible framework spatial requirements of MOFs for yielding breathing behaviors are highlighted as the design strategies for new syntheses.

Effects of Nb Promoter on the Properties of Cu/ZnO/SBA-15 Catalyst and Performance in Methanol Production

2016 ◽  
Vol 708 ◽  
pp. 94-97 ◽  
Author(s):  
Noor Asmawati Mohd Zabidi ◽  
Sara Tasfy ◽  
Maizatul Shima Shaharun
Keyword(s):  
Mesoporous Silica ◽  
Active Sites ◽  
Fixed Bed ◽  
Alternative Route ◽  
Methanol Production ◽  
Surface Areas ◽  
Attractive Option ◽  
And Performance ◽  
Hydrogenation Of Co

Hydrogenation of CO2 provides an alternative route for methanol production and attractive option for CO2 utilization. The present work investigates the synthesis of Cu-based catalyst on mesoporous silica (SBA-15) and promotion of the Cu-based catalyst with niobium (Nb). The addition of Nb promoter enhanced the reducibility and dispersion of the active sites as well as increased the BET and Cu surface areas. The performance of the synthesized catalyst in the hydrogenation of CO2 was evaluated in a fixed-bed microreactor at 523K, 22.5bar and H2/CO2 of 3. The CO2 conversion using the Cu/ZnO/SBA-15 catalyst was 14.2 % and increased to 17.1% on the Nb-promoted catalyst. The yield of methanol obtained using the un-promoted Cu-based catalyst was 51.4 g/h.gcat and it increased to 143 g/h.gcat over the Nb-promoted catalyst.

Potential Applications of Bacterial Cellulose in Environmental and Pharmaceutical Sectors

2020 ◽  
Vol 26 (45) ◽  
pp. 5793-5806
Author(s):  
Mazhar Ul-Islam ◽  
Salman Ul-Islam ◽  
Sumayia Yasir ◽  
Atiya Fatima ◽  
Md. Wasi Ahmed ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
3D Structure ◽  
Three Dimensional ◽  
Base Material ◽  
Advanced Materials ◽  
Ex Situ ◽  
Potential Applications ◽  
Wide Readership ◽  
Water Filters

Biopolymers and their composites have been extensively investigated in recent years for multiple applications, especially in environmental, medical, and pharmaceutical fields. Bacterial cellulose (BC) has emerged as a novel biomaterial owing to its nontoxic, high-liquid absorbing and holding capacity, drug-carrying ability, and pollutant absorbing features. Additionally, its web-shaped three-dimensional (3D) structure and hydrogen bonding sites have incited a combination of various nanoparticles, polymers, and other materials with BC in the form of composites. Such BC-based composites have been developed through in-situ, ex-situ, and solution casting methods for targeted applications, such as air and water filters, controlled drug delivery systems, wound dressing materials, and tissue regeneration. This review details the production and development of BCbased composites with different materials and by various methods. It further describes various applications of BC-based composites in the environmental and pharmaceutical sectors, with specific examples from the recent literature. This review could potentially appeal a wide readership in these two emerging fields, where novel and advanced materials for different applications have been developed on a regular basis using BC as the base material.

Aziridine-Functionalized Mesoporous Silica Membranes on Polymeric Hollow Fibers: Synthesis and Single-Component CO2 and N2 Permeation Properties

2014 ◽  
Vol 54 (16) ◽  
pp. 4407-4413 ◽  
Author(s):  
Hyung-Ju Kim ◽  
Watcharop Chaikittisilp ◽  
Kwang-Suk Jang ◽  
Stephanie A. Didas ◽  
Justin R. Johnson ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Single Component ◽  
Hollow Fibers ◽  
Silica Membranes ◽  
Functionalized Mesoporous Silica ◽  
Permeation Properties

Bio-Inspired Nanocomposites: From Synthesis Toward Potential Applications

2001 ◽  
Vol 711 ◽  
Author(s):  
Tewodros Asefa ◽  
Neil Coombs ◽  
Hiltrud Grondey ◽  
Mietek Jaroniec ◽  
Michal Kruk ◽  
...  
Keyword(s):  
Asymmetric Catalysis ◽  
Environmental Remediation ◽  
High Surface ◽  
Advanced Materials ◽  
Periodic Mesoporous Organosilica ◽  
Uniform Size ◽  
Surface Areas ◽  
Heavy Metal Remediation ◽  
Potential Applications ◽  
Inorganic Framework

ABSTRACTIn recent years, the extraordinary properties of bio-inspired nanocomposites have stimulated great interest in the development of bottom-up synthetic approaches to organic-inorganic hybrid materials in which molecular scale control is exerted over the interface between the organic and inorganic moieties. These developments have led to advanced materials with novel properties and potential use in catalysis, sensing, separations and environmental remediation. Periodic mesoporous organosilica (PMO) materials are an entirely new class of nanocomposites with molecularly integrated organic/inorganic networks, high surface areas and pore volumes, and well ordered and uniform size pores and channels. We recently have extended the approach to include novel PMO materials incorporating chiral and heteroatom-containing organic functional groups inside the inorganic framework that may be useful in asymmetric catalysis, enantiomeric separations and heavy metal remediation.

Mesoporous silica and organosilica materials — Review of their synthesis and organic functionalization

2012 ◽  
Vol 90 (12) ◽  
pp. 1015-1031 ◽  
Author(s):  
Tewodros Asefa ◽  
Zhimin Tao
Keyword(s):  
Mesoporous Silica ◽  
Rational Design ◽  
Synthetic Methods ◽  
Organic Functionalization ◽  
Surface Areas ◽  
Silica Materials ◽  
Potential Applications ◽  
Mesoporous Silica Materials ◽  
Mesoporous Organosilicas ◽  
Organosilica Materials

Mesoporous silica and organosilica materials are a class of nanostructured materials that have porous structures with tunable nanometer pores, large surface areas, high pore volumes, and, in some cases, well-ordered mesostructures. Furthermore, in the case of mesoporous organosilicas, the materials possess various types of organic functional groups. This review highlights the different synthetic methods developed for mesoporous silica and organosilica nanomaterials. The review also discusses the various synthetic strategies used to functionalize the surfaces of mesoporous silica materials and produce highly functionalized mesoporous materials. Rational design and synthetic methods developed to place judiciously chosen one or more than one type of functional group(s) on the surfaces of mesoporous silica materials and generate monofunctional and multifunctional mesoporous silica materials are also introduced. These organic functionalization methods have made possible the synthesis of organically functionalized mesoporous silicas and mesoporous organosilicas with various interesting properties and many potential applications in different areas, ranging from catalysis to drug delivery and biosensing.

Synthesis of new multivalent metal ion functionalized mesoporous silica and studies of their enhanced antimicrobial and cytotoxicity activities

2019 ◽  
Vol 7 (45) ◽  
pp. 7235-7245 ◽  
Author(s):  
Suman Chirra ◽  
Suresh Siliveri ◽  
Ravi Gangalla ◽  
Srinath Goskula ◽  
Sripal Reddy Gujjula ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Molecular Sieves ◽  
Metal Ion ◽  
Sol Gel ◽  
Mesoporous Molecular Sieves ◽  
Functionalized Mesoporous Silica ◽  
Cytotoxicity Studies ◽  
Cytotoxicity Activities ◽  
Multivalent Metal ◽  
Mcm 41

In the present study, we have reported the synthesis of a transition metal (Me = Ti, V, and Pd) incorporated into MCM-41 mesoporous molecular sieves (Si/Me = 20) synthesized by the sol–gel method. Antimicrobial and cytotoxicity studies were screened for the same.

scholarly journals A Review on Breathing Behaviors of Metal-Organic-Frameworks (MOFs) for Gas Adsorption

2021 ◽  
Author(s):  
Mays Alhamami ◽  
Huu Doan ◽  
Chil-Hung Cheng
Keyword(s):  
Molecular Sieves ◽  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Design Strategies ◽  
Surface Areas ◽  
Host Materials ◽  
Potential Applications ◽  
Metal Organic ◽  
Definition Of ◽  
Dynamics Simulations

Metal-organic frameworks (MOFs) are a new class of microporous materials that possess framework flexibility, large surface areas, “tailor-made” framework functionalities, and tunable pore sizes. These features empower MOFs superior performances and broader application spectra than those of zeolites and phosphine-based molecular sieves. In parallel with designing new structures and new chemistry of MOFs, the observation of unique breathing behaviors upon adsorption of gases or solvents stimulates their potential applications as host materials in gas storage for renewable energy. This has attracted intense research energy to understand the causes at the atomic level, using in situ X-ray diffraction, calorimetry, Fourier transform infrared spectroscopy, and molecular dynamics simulations. This article is developed in the following order: first to introduce the definition of MOFs and the observation of their framework flexibility. Second, synthesis routes of MOFs are summarized with the emphasis on the hydrothermal synthesis, owing to the environmental-benign and economically availability of water. Third, MOFs exhibiting breathing behaviors are summarized, followed by rationales from thermodynamic viewpoint. Subsequently, effects of various functionalities on breathing behaviors are appraised, including using post-synthetic modification routes. Finally, possible framework spatial requirements of MOFs for yielding breathing behaviors are highlighted as the design strategies for new syntheses.

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