scholarly journals Enhanced Kinetic Removal of Ciprofloxacin onto Metal-Organic Frameworks by Sonication, Process Optimization and Metal Leaching Study

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1422 ◽  
Author(s):  
Dehghan ◽  
Mohammadi ◽  
Yousefi ◽  
Najafpoor ◽  
Shams ◽  
...  
Keyword(s):  
Mixing Time ◽  
Metal Organic Frameworks ◽  
Bet Surface Area ◽  
Adsorption Efficiency ◽  
Crystalline Morphology ◽  
Mechanical Agitation ◽  
Sorption Model ◽  
Kinetic Coefficients ◽  
Metal Organic ◽  
Mass Transfer Kinetic

Metal-organic frameworks (MOFs) are currently recognized as unique platforms for environmental studies. This study evaluated the potential of nine MOFs from ZIF-8, ZIF-67, and UIO-66 families for the removal of ciprofloxacin (CIP), a toxic, bio-accumulative, and persistent fluoroquinolone antibiotic. ZIF-67-SO4, with a rhombic crystalline morphology and 1375 m2/g BET surface area, has the highest CIP adsorption efficiency among the studied MOFs. The mathematical sorption model predicted that the highest CIP removal (99.2%) occurs when adsorbent dose, pH, and agitation time are adjusted to 6.82, 832.4 mg/L, and 39.95 min, respectively. Further studies revealed that the CIP adsorbed onto ZIF-67-SO4 in monolayer (qmax: 2537.5 mg/g) and chemisorption controlled the rate of the process. Mass transfer kinetic coefficients improved significantly by sonication at 35 KHz in comparison with mechanical agitation. Thermodynamic parameters (minus signs of ∆G° [7.8 to 14.2], positive signs of ∆H° (58.9 KJ/mol), and ∆S° (0.23 KJ/mol·K)) demonstrated the spontaneous, endothermic, and chemical sorption of CIP. The level of cobalt leached from ZIF-67-SO4 structure varied 1.2–4.5 mg/L, depending on pH, mixing time, and agitation type. In conclusion, the excellent adsorption properties of ZIF-67-SO4 for CIP, made it an outstanding candidate for environmental protection purposes.

Crystal engineering on superpolyhedral building blocks in metal–organic frameworks applied in gas adsorption

2015 ◽  
Vol 71 (6) ◽  
pp. 613-618 ◽  
Author(s):  
Ying-Pin Chen ◽  
Tian-Fu Liu ◽  
Stephen Fordham ◽  
Hong-Cai Zhou
Keyword(s):  
Surface Area ◽  
Crystal Engineering ◽  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Supercritical Drying ◽  
Building Blocks ◽  
Structural Features ◽  
Open Channels ◽  
Bet Surface Area ◽  
Metal Organic

Two metal–organic frameworks [PCN-426(Ni) and PCN-427(Cu)] have been designed and synthesized to investigate the structure predictability using a SBB (supermolecular building blocks) approach. Tetratopic ligands featuring 120° angular carboxylate moieties were coordinated with a [Ni3(μ3-O)] cluster and a [Cu2O2] unit, respectively. As topologically predicted, 4-connected networks with square coordination adopted the nbo net for the Ni-MOF and ssb net for the Cu-MOF. PCN-426(Ni) was augmented with 12-connected octahedral SBBs, while PCN-427(Cu) was constructed with tetragonal open channels. After a CO2 supercritical drying procedure, the PCN-426(Ni) possessed a Brunauer–Emmett–Teller (BET) surface area as high as 3935 m2 g−1 and impressively high N2 uptake of 1500 cm3 g−1. This work demonstrates the generalization of the SBB strategy, finding an alternative to inconvenient synthetic processes to achieve the desired structural features.

scholarly journals Metal-Organic Frameworks-Based Nanomaterials for Drug Delivery

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3652
Author(s):  
Mohammad Reza Saeb ◽  
Navid Rabiee ◽  
Masoud Mozafari ◽  
Ebrahim Mostafavi
Keyword(s):  
Drug Delivery ◽  
Surface Area ◽  
Metal Organic Frameworks ◽  
Bet Surface Area ◽  
The Past ◽  
And Topology ◽  
Metal Organic ◽  
Almost All ◽  
Porous Nanomaterials ◽  
Encapsulated Nanoparticles

The composition and topology of metal-organic frameworks (MOFs) are exceptionally tailorable; moreover, they are extremely porous and represent an excellent Brunauer–Emmett–Teller (BET) surface area (≈3000–6000 m2·g−1). Nanoscale MOFs (NMOFs), as cargo nanocarriers, have increasingly attracted the attention of scientists and biotechnologists during the past decade, in parallel with the evolution in the use of porous nanomaterials in biomedicine. Compared to other nanoparticle-based delivery systems, such as porous nanosilica, nanomicelles, and dendrimer-encapsulated nanoparticles, NMOFs are more flexible, have a higher biodegradability potential, and can be more easily functionalized to meet the required level of host–guest interactions, while preserving a larger and fully adjustable pore window in most cases. Due to these unique properties, NMOFs have the potential to carry anticancer cargos. In contrast to almost all porous materials, MOFs can be synthesized in diverse morphologies, including spherical, ellipsoidal, cubic, hexagonal, and octahedral, which facilitates the acceptance of various drugs and genes.

scholarly journals Ni–citric acid coordination polymer as a practical catalyst for multicomponent reactions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mostafa Koolivand ◽  
Mohsen Nikoorazm ◽  
Arash Ghorbani-Choghamarani ◽  
Reza Azadbakht ◽  
Bahman Tahmasbi
Keyword(s):  
Citric Acid ◽  
Multicomponent Reactions ◽  
Metal Organic Frameworks ◽  
Bet Surface Area ◽  
Efficient Catalyst ◽  
Bet Analysis ◽  
Metal Organic ◽  
Ft Ir ◽  
Porous Microstructures ◽  
Adsorption Desorption

AbstractCoordinative polymers (CP) are a subclass of Metal–organic frameworks (MOFs) with porous microstructures which have been widely synthesized in recent years and applied in various fields especially in catalysis science. In this work Coordinative polymers (CP) of nickel and citric acid (CA) was prepared as a new catalyst (Ni-CP) and applied in organic multicomponent reactions. The obtained catalyst was characterized by SEM, WDX, EDS, AAS, FT-IR, XRD and BET analysis. N2 adsorption–desorption isotherms indicate good BET surface area for Ni-CP; therefore can be employed as an efficient catalyst in multicomponent reactions for the synthesis of polyhydroquinoline and 2,3-dihydroquinazolin-4(1H)-one derivatives. Finally, this catalyst was recovered and reused several consecutive times.

Fine Structural Analysis of Solvent Activated Cu-BTC for Carbon Dioxide Capture

2014 ◽  
Vol 625 ◽  
pp. 209-212
Author(s):  
Sujan Chowdhury ◽  
Tan Wei Leng ◽  
Iqbal Ahmed ◽  
Mohamad Azmi Bustam ◽  
Mohd Shariff Azmi
Keyword(s):  
Carbon Dioxide ◽  
Structural Analysis ◽  
Carbon Dioxide Capture ◽  
Metal Organic Frameworks ◽  
Bet Surface Area ◽  
Type I ◽  
New Class ◽  
Adsorption Capacities ◽  
Metal Organic ◽  
Washing Method

Metal organic frameworks (MOFs) are presently under substantial investigation due to their properties and high potential as new class of porous material for carbon dioxide (CO2) capture. Experimentally, Cu-BTC crystalline frameworks with diameter of approximately 6-13 μm were found. The washing method of Cu-BTC was examined using three different solvent, (a) ethanol and water (1:1), (b) water, and (c) acetone to improve the BET surface area. These materials display approximately type I isotherms with no hysteresis and saturation. CO2 adsorption capacities study shows that acetone wash material can store about 5.98 mmolg-1of CO2 at 25oC and 1.2 bar.

Metal-Organic Frameworks

2021 ◽  
Author(s):  
Lars Öhrström ◽  
Francoise M. Amombo Noa
Keyword(s):  
Metal Organic Frameworks ◽  
Metal Organic

Substrate templated synthesis of single-phase and uniform Zr-porphyrin-based metal–organic frameworks

2020 ◽  
Vol 7 (1) ◽  
pp. 221-231
Author(s):  
Seong Won Hong ◽  
Ju Won Paik ◽  
Dongju Seo ◽  
Jae-Min Oh ◽  
Young Kyu Jeong ◽  
...  
Keyword(s):  
Chemical Bath Deposition ◽  
Single Phase ◽  
Metal Organic Frameworks ◽  
Templated Synthesis ◽  
Pore Structures ◽  
Phase Pure ◽  
Metal Organic ◽  
Cbd Method

We successfully demonstrate that the chemical bath deposition (CBD) method is a versatile method for synthesizing phase-pure and uniform MOFs by controlling their nucleation stages and pore structures.

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