scholarly journals Functional Metal Organic Framework/SiO2 Nanocomposites: From Versatile Synthesis to Advanced Applications

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1823 ◽  
Author(s):  
Mengyu Ma ◽  
Liangyu Lu ◽  
Hongwei Li ◽  
Yuzhu Xiong ◽  
Fuping Dong
Keyword(s):  
Structural Characteristics ◽  
Metal Organic Framework ◽  
High Specific Surface Area ◽  
Inorganic Materials ◽  
High Porosity ◽  
Active Metal ◽  
Metal Organic ◽  
Sio2 Nanocomposites ◽  
And Performance ◽  
The Stability

Metal organic frameworks (MOFs), also called porous coordination polymers, have attracted extensive attention as molecular-level organic-inorganic hybrid supramolecular solid materials bridged by metal ions/clusters and organic ligands. Given their advantages, such as their high specific surface area, high porosity, and open active metal sites, MOFs offer great potential for gas storage, adsorption, catalysis, pollute removal, and biomedicine. However, the relatively weak stability and poor mechanical property of most MOFs have limited the practical application of such materials. Recently, the combination of MOFs with inorganic materials has been found to provide a possible strategy to solve such limitations. Silica, which has excellent chemical stability and mechanical properties, shows great advantages in compounding with MOFs to improve their properties and performance. It not only provides structured support for MOF materials but also improves the stability of materials through hydrophobic interaction or covalent bonding. This review summarizes the fabrication strategy, structural characteristics, and applications of MOF/silica composites, focusing on their application in chromatographic column separation, catalysis, biomedicine, and adsorption. The challenges of the application of MOF/SiO2 composites are addressed, and future developments are prospected.

scholarly journals Removal of Tetracycline in Sewage and Dairy Products with High-Stable MOF

Molecules ◽  
2020 ◽  
Vol 25 (6) ◽  
pp. 1312 ◽  
Author(s):  
Kan Li ◽  
Jing-jing Li ◽  
Ni Zhao ◽  
Ying Ma ◽  
Bin Di
Keyword(s):  
Dairy Products ◽  
Physical Adsorption ◽  
Metal Organic Framework ◽  
High Porosity ◽  
Adsorption Model ◽  
Initial Ph ◽  
Metal Organic ◽  
Pseudo Second Order ◽  
The Stability ◽  
Best Fit

Serious environmental and human health problems caused by the abuse of antibiotics have attracted worldwide concern. Recently, metal–organic frameworks (MOFs) with high porosity have drawn wide attention for their effects in the adsorption and removal of pollutants from complex matrices. Herein, a high-stable metal organic framework (MOF), i.e., ((ZnCl2)3(L)2·DMF)n, where L=1,3,5-tris((pyridin-4-ylthio)methyl)benzene), MOF 1, was applied to adsorb and remove tetracycline from sewage and dairy products. The results showed that MOF 1 exhibited a strong performance in the adsorption of tetracycline. The effects of initial pH values, adsorbent dose, contact time and ionic strength of the adsorption performance of MOF 1 were investigated. The adsorption kinetics best fit the pseudo-second order model, and the adsorption isotherms matched the Langmuir adsorption model well. It was indicated that both chemical adsorption and physical adsorption play an important role in the adsorption process, and the adsorption of tetracycline was homogeneous and occurred on a monolayer on the surface of MOF 1. Additionally, the stability of MOF 1 and the details of the adsorption mechanism were also investigated. Thus, this study provides a new candidate for the application of MOFs-based adsorbents in the removal of antibiotics from sewage and dairy products.

scholarly journals Ce-MOF with Intrinsic Haloperoxidase-Like Activity for Ratiometric Colorimetric Detection of Hydrogen Peroxide

Biosensors ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 204
Author(s):  
Yanyan Cheng ◽  
Ling Liang ◽  
Fanggui Ye ◽  
Shulin Zhao
Keyword(s):  
Structural Characteristics ◽  
Metal Organic Framework ◽  
Colorimetric Detection ◽  
Mixed Valence ◽  
Bromophenol Blue ◽  
Phenol Red ◽  
Chromogenic Substrate ◽  
Colorimetric Sensing ◽  
Sensing Platform ◽  
Metal Organic

Metal–organic framework (MOF) nanozymes, as emerging members of the nanozymes, have received more and more attention due to their composition and structural characteristics. In this work, we report that mixed-valence state Ce-MOF (MVCM) has intrinsic haloperoxidase-mimicking activity. MVCM was synthesized by partial oxidation method using Ce-MOF as a precursor. In the presence of H2O2 and Br−, MVCM can catalyze oxidative bromination of chromogenic substrate phenol red (PR) to produce the blue product bromophenol blue (Br4PR), showing good haloperoxidase-like activity. Because of the special chromogenic substrate, we constructed a ratiometric colorimetric-sensing platform by detecting the absorbance of the MVCM-(PR, Br−) system at wavelengths of 590 and 430, for quantifying H2O2, where the detection limit of the H2O2 is 3.25 μM. In addition, the haloperoxidase-mimicking mechanism of the MVCM is proposed. Moreover, through enzyme kinetics monitoring, the Km (H2O2 and NH4Br) of the MVCM is lower than that of cerium oxide nanomaterials, indicating that the MVCM has a stronger binding affinity for H2O2 and NH4Br than other materials. This work provides more application prospects for the development of nanozymes in the field of biosensors in the future.

Metal-Organic Framework Transistors for Dopamine Sensing

2021 ◽  
Author(s):  
Jiajun Song ◽  
Jianzhong Zheng ◽  
Anneng Yang ◽  
Hong Liu ◽  
Zeyu Zhao ◽  
...  
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
High Porosity ◽  
Two Dimensional ◽  
Metal Organic ◽  
Organic Framework

Two-dimensional (2D) conductive metal-organic frameworks (MOFs) can not only inherit the high porosity and tailorability of traditional MOFs but also exhibit unique charge transport properties, offering promising opportunities for applications...

Highly stable metal-organic framework UiO-66-NH2 for high-performance triboelectric nanogenerators

2021 ◽  
Author(s):  
Yong-Mei Wang ◽  
Xinxin Zhang ◽  
Dingyi Yang ◽  
Liting Wu ◽  
Jiaojiao Zhang ◽  
...  
Keyword(s):  
High Performance ◽  
Metal Organic Framework ◽  
High Surface ◽  
High Surface Area ◽  
Triboelectric Nanogenerator ◽  
High Porosity ◽  
Chemically Modified ◽  
Metal Organic ◽  
Triboelectric Nanogenerators ◽  
Organic Framework

Abstract The high porosity, controllable size, high surface area, and chemical versatility of a metal-organic framework (MOF) enable it a good material for a triboelectric nanogenerator (TENG), and some MOFs have been incorporated in the fabrication of TENGs. However, the understanding of effects of MOFs on the energy conversion of a TENG is still lacking, which inhibits the improvement of the performance of MOF-based TENGs. Here, UiO-66-NH2 MOFs were found to significantly increase the power of a TENG and the mechanism was carefully examined. The electron-withdrawing ability of Zr-based UiO-66-family MOFs was enhanced by designing the amino functionalized 1,4-terephthalic acid (1,4-BDC) as ligand. The chemically modified UiO-66-NH2 was found to increase the surface roughness and surface potential of a composite film with MOFs embedded in polydimethylsiloxane (PDMS) matrix. Thus the total charges due to the contact electrification increased significantly. The composite-based TENG was found to be very durable and its output voltage and current were 4 times and 60 times higher than that of a PDMS-based TENG. This work revealed an effective strategy to design MOFs with excellent electron-withdrawing abilities for high-performance TENGs.

A Solvothermally in Situ Generated Mixed-ligand Approach for NLO-Active Metal−Organic Framework Materials

2005 ◽  
Vol 44 (12) ◽  
pp. 4148-4150 ◽  
Author(s):  
Yong-Tao Wang ◽  
Hai-Hua Fan ◽  
He-Zhou Wang ◽  
Xiao-Ming Chen
Keyword(s):  
Metal Organic Framework ◽  
Mixed Ligand ◽  
Framework Materials ◽  
Active Metal ◽  
Metal Organic ◽  
Organic Framework

Soluble porous carbon cage-encapsulated highly active metal nanoparticle catalysts

2021 ◽  
Author(s):  
Hangyu Liu ◽  
Liyu Chen ◽  
Chun-Chao Hou ◽  
Yong-Sheng Wei ◽  
Qiang Xu
Keyword(s):  
Porous Carbon ◽  
Metal Organic Framework ◽  
Metal Nanoparticle ◽  
Hydrogen Peroxide Decomposition ◽  
Carbon Cage ◽  
Nanoparticle Catalysts ◽  
Highly Active ◽  
Active Metal ◽  
Peroxide Decomposition ◽  
Metal Organic

Metal nanoparticles are encapsulated within soluble porous carbon cages by a silica-shelled metal–organic framework pyrolysis approach. The catalyst shows high catalytic activities for hydrogen peroxide decomposition and ammonia borane hydrolysis.

scholarly journals Negative cooperativity upon hydrogen bond-stabilized O2 adsorption in a redox-active metal–organic framework

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Julia Oktawiec ◽  
Henry Z. H. Jiang ◽  
Jenny G. Vitillo ◽  
Douglas A. Reed ◽  
Lucy E. Darago ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Metal Organic Framework ◽  
Negative Cooperativity ◽  
O2 Adsorption ◽  
Redox Active ◽  
Active Metal ◽  
Metal Organic ◽  
Redox Active Metal ◽  
Organic Framework

scholarly journals Enhancing photovoltages at p-type semiconductors through a redox-active metal-organic framework surface coating

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Anna M. Beiler ◽  
Brian D. McCarthy ◽  
Ben A. Johnson ◽  
Sascha Ott
Keyword(s):  
Metal Organic Framework ◽  
Three Dimensions ◽  
Photoelectrochemical Performance ◽  
Naphthalene Diimide ◽  
Thermodynamic Potentials ◽  
Redox Active ◽  
Active Metal ◽  
Metal Organic ◽  
Conductive Substrates ◽  
P Type

AbstractSurface modification of semiconductors can improve photoelectrochemical performance by promoting efficient interfacial charge transfer. We show that metal-organic frameworks (MOFs) are viable surface coatings for enhancing cathodic photovoltages. Under 1-sun illumination, no photovoltage is observed for p-type Si(111) functionalized with a naphthalene diimide derivative until the monolayer is expanded in three dimensions in a MOF. The surface-grown MOF thin film at Si promotes reduction of the molecular linkers at formal potentials >300 mV positive of their thermodynamic potentials. The photocurrent is governed by charge diffusion through the film, and the MOF film is sufficiently conductive to power reductive transformations. When grown on GaP(100), the reductions of the MOF linkers are shifted anodically by >700 mV compared to those of the same MOF on conductive substrates. This photovoltage, among the highest reported for GaP in photoelectrochemical applications, illustrates the power of MOF films to enhance photocathodic operation.

Stable artificial solid electrolyte interphase films for lithium metal anode via metal–organic frameworks cemented by polyvinyl alcohol

2020 ◽  
Vol 8 (1) ◽  
pp. 251-258 ◽  
Author(s):  
Lishuang Fan ◽  
Zhikun Guo ◽  
Yu Zhang ◽  
Xian Wu ◽  
Chenyang Zhao ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Metal Organic Framework ◽  
Solid Electrolyte Interphase ◽  
Lithium Metal ◽  
Metal Anode ◽  
Lithium Metal Anode ◽  
Sei Film ◽  
Metal Organic ◽  
Li Metal Anode ◽  
The Stability

Polyvinyl alcohol (PVA) as a “glue” to cement the metal organic framework (Zn-MOF) sheet as a reasonable artificial SEI film. The artificial SEI film can efficiently adapt to the changes of the volume during the cycle, significantly improve the stability of the Li metal anode.

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