Vapor-assisted preparation of Mn/Fe/Co/Zn–Cu bimetallic metal–organic frameworks based on octahedron micron crystals (PCN-6′)

2019 ◽  
Vol 43 (17) ◽  
pp. 6452-6456 ◽  
Author(s):  
Jiangfeng Yang ◽  
Bingjie Du ◽  
Ning Yuan ◽  
Xiaoxia Jia ◽  
Jinping Li
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Crystal Morphology ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Strong Acid ◽  
Weak Acid ◽  
Metal Organic

A Cu-based metal–organic framework (PCN-6′) with octahedral crystal morphology was synthesized using a strong acid (HCl) and characterized by SEM, TGA and BET, which showed a larger specific surface area and pore volume than the corresponding counterpart that was prepared using a weak acid (oxalate).

Property of Nanoporous Metal-Organic Frameworks at Different Synthesis Temperature

2012 ◽  
Vol 427 ◽  
pp. 123-127
Author(s):  
Yuan Hui Ma ◽  
Lei Zhang ◽  
Cheng Chun Tang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Reaction Temperature ◽  
Metal Organic Frameworks ◽  
Synthesis Temperature ◽  
Structure Stability ◽  
Nanoporous Metal ◽  
Metal Organic ◽  
Ft Ir

The nanoporous metal-organic frameworks were synthesized under solvothermal conditions using organic solvent dimethylformamide. The samples were characterized by XRD, SEM, TGA, FT-IR and specific surface area for their properties difference. When the reaction temperature rises, the particle size becomes larger. All TGA curves are the basically same, the framework structure begins to be destroyed from 500°C up to around 600°C. The metal-organic frameworks accepted at reaction temperature 190°C have larger specific surface area and better structure stability.

scholarly journals Application of CoMn/CoFe layered double hydroxide based on metal-organic frameworks template to activate peroxymonosulfate for 2, 4-dichlorophenol degradation

2021 ◽  
Author(s):  
Chenyu Liu ◽  
Haitong Wei ◽  
Yanhui Gao ◽  
Ning Wang ◽  
Xiaoying Yuan ◽  
...  
Keyword(s):  
Specific Surface ◽  
Pore Structure ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Sites ◽  
Metal Organic Frameworks ◽  
High Specific Surface Area ◽  
State Transformation ◽  
Alkaline Conditions ◽  
Metal Organic

Abstract Metal-Organic Frameworks (MOFs) have unique properties and stable structure, which have been widely used as templates/precursors to prepare well-developed pore structure and high specific surface area materials. In this article, an innovative and facile method of crystal reorganization was designed by using MOFs as sacrificial templates to prepare LDH nano-layer sheet structure through a pseudomorphic conversion process under alkaline conditions. The obtained CoMn-LDH and CoFe-LDH catalysts broke the ligand of MOFs and reorganized the structure on the basis of retaining a high specific surface area and a large number of pores, which have higher specific surface area and well-developed pore structure than LDH catalysts prepared by traditional methods, and thus provide more active sites to activate PMS. Due to the unique framework structure of MOFs, the MOF derived CoMn-LDH and CoFe-LDH catalysts could provide more active sites to activate PMS, and achieve a 2, 4-dichlorophenol (2, 4-DCP) degradation of 99.3% and 99.2% within 20 min, respectively. Besides, the two LDH catalysts displayed excellent degradation performance for bisphenol A (BPA), ciprofloxacin (CIP) and 2, 4-dichlorophenoxyacetic acid (2, 4-D). XPS indicated that the valence state transformation of metal elements participated in PMS activation. EPR manifested sulfate radical () and singlet oxygen (1O2) were the main species for degrading pollutants. In addition, after the three-cycle experiment, the CoMn-LDH and CoFe-LDH catalysts also showed long-term stability with a slight activity decrease in the third cycle. The phytotoxicity assessment determined by the germination of mung beans proved that PMS activation by MOFs-derived LDH catalyst can basically eliminate the phytotoxicity of 2, 4-D solution. This research not only developed high-activity LDH catalysts for PMS activation, but also expanded the environmental applications of MOFs derivants.

A review on metal-organic framework-derived anode materials for potassium-ion batteries

2021 ◽  
Author(s):  
Qiongyi Xie ◽  
Hong Ou ◽  
Qingyun Yang ◽  
Xiaoming Lin ◽  
Akif Zeb ◽  
...  
Keyword(s):  
Energy Storage ◽  
Specific Surface ◽  
Surface Area ◽  
Anode Materials ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
High Specific Surface Area ◽  
Electrochemical Energy Storage ◽  
Energy Storage And Conversion ◽  
Metal Organic

In recent years, metal-organic frameworks (MOFs) have been widely used in various fields, including electrochemical energy storage and conversion because of their excellent properties, such as high specific surface area,...

scholarly journals Adsorption of carbon dioxide on MIL53(Al), CuBTC and K- NaX zeolite

2020 ◽  
Vol 4 (3) ◽  
pp. 30-42
Author(s):  
Fehime Cakicioglu-Ozkan
Keyword(s):  
Carbon Dioxide ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Co2 Adsorption ◽  
Ultrasonic Method ◽  
Metal Organic Frameworks ◽  
Isosteric Heat ◽  
Metal Organic ◽  
Increasing Temperature

CO2 adsorption on K exchanged NaX zeolites, and metal organic frameworks (MOFs), namely Cu-BTC and MIL53 (Al) was studied at 5 °C and 25 °C.  Exchange via ultrasonic and traditional methods, was conducted at 50 °C and 70 °C. The maximum replacement of Na+ ion with K+ ion in the extra framework of zeolite was increased from 76% to 83% with increasing temperature from 50 °C to 70 °C in the ultrasonic method which is more effective than traditional one. Compared with the zeolites, the MOF adsorbents used in this work have higher Langmuir specific surface area values namely 1278, 1473 and about 1000 m2/g for MIL 53, Cu-BTC and zeolite adsorbents respectively. The resulting CO2 isotherms can be well represented by the Toth equation. Comparison of the isosteric heat of adsorption at zero loading shows that CO2 was adsorbed more weakly on MOFs than zeolites.

scholarly journals Modeling of CO2 adsorption capacity by porous metal organic frameworks using advanced decision tree-based models

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jafar Abdi ◽  
Fahimeh Hadavimoghaddam ◽  
Masoud Hadipoor ◽  
Abdolhossein Hemmati-Sarapardeh
Keyword(s):  
Decision Tree ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Specific Surface Area ◽  
Metal Organic Frameworks ◽  
Gradient Boosting ◽  
Wide Range ◽  
Extreme Gradient Boosting ◽  
Metal Organic

AbstractIn recent years, metal organic frameworks (MOFs) have been distinguished as a very promising and efficient group of materials which can be used in carbon capture and storage (CCS) projects. In the present study, the potential ability of modern and powerful decision tree-based methods such as Categorical Boosting (CatBoost), Light Gradient Boosting Machine (LightGBM), Extreme Gradient Boosting (XGBoost), and Random Forest (RF) was investigated to predict carbon dioxide adsorption by 19 different MOFs. Reviewing the literature, a comprehensive databank was gathered including 1191 data points related to the adsorption capacity of different MOFs in various conditions. The inputs of the implemented models were selected as temperature (K), pressure (bar), specific surface area (m2/g) and pore volume (cm3/g) of the MOFs and the output was CO2 uptake capacity (mmol/g). Root mean square error (RMSE) values of 0.5682, 1.5712, 1.0853, and 1.9667 were obtained for XGBoost, CatBoost, LightGBM, and RF models, respectively. The sensitivity analysis showed that among all investigated parameters, only the temperature negatively impacts the CO2 adsorption capacity and the pressure and specific surface area of the MOFs had the most significant effects. Among all implemented models, the XGBoost was found to be the most trustable model. Moreover, this model showed well-fitting with experimental data in comparison with different isotherm models. The accurate prediction of CO2 adsorption capacity by MOFs using the XGBoost approach confirmed that it is capable of handling a wide range of data, cost-efficient and straightforward to apply in environmental applications.

scholarly journals Study on removal of volatile organic compounds by metal-organic framework composite material

2021 ◽  
Author(s):  
Yong-I Xiao ◽  
Joy Thomas ◽  
Nhat-Thien Nguyen ◽  
Thuy-Trang Le ◽  
Chang Tang Chang
Keyword(s):  
Volatile Organic Compounds ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Organic Compounds ◽  
Specific Surface Area ◽  
Physical Adsorption ◽  
Metal Organic Framework ◽  
Volatile Organic ◽  
Metal Organic

Abstract For decades, people have made many efforts to improve air quality. Volatile Organic Compounds (VOCs) in the chemical and textile industries are indeed listed as serious problems that need to be controlled to avoid the emission of toxic substances and reduce the concentration of ozone in the atmosphere. In this study, a novel β-cyclodextrin-metal-organic framework (β-CD-MOF) was produced by a green and simple method to achieve the goal of making environmentally friendly adsorption materials through a green process. Compared with pure β-CD (the specific surface area is only 22 m2/g), β-CD-MOF has higher crystallinity and larger specific surface area (up to 869 m2/g). Through the dynamic acetone adsorption device, the adsorption capacity of β-CD-MOF for acetone can reach 211 mg/g at room temperature, which is higher than that of activated carbon (the adsorption capacity is only about 192 mg/g). In addition, the adsorption of acetone by β-CD-MOF is a single-layer physical adsorption behavior through isothermal adsorption simulation, and it is known from the kinetic simulation that the adsorption mainly occurs on the surface, and the limiting condition of the adsorption is mainly external mass transfer. According to the results of thermodynamic analysis, the adsorption reaction is a spontaneous and exothermic reaction. Because the adsorption is a physical adsorption behavior, β-CD-MOF adsorbent has good reusability. After four cycling experiments, the adsorption capacity of acetone is only reduced by about 10%. This research has provided an environmentally friendly, low-cost, and high-efficiency solution for the removal of VOCs.

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