scholarly journals Buffered Coordination Modulation as a Means of Controlling Crystal Morphology and Molecular Diffusion in an Anisotropic Metal–Organic Framework

2021 ◽  
Vol 143 (13) ◽  
pp. 5044-5052
Author(s):  
Kristen A. Colwell ◽  
Megan N. Jackson ◽  
Rodolfo M. Torres-Gavosto ◽  
Sudi Jawahery ◽  
Bess Vlaisavljevich ◽  
...  
Keyword(s):  
Crystal Morphology ◽  
Molecular Diffusion ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Anisotropic Metal ◽  
Organic Framework

scholarly journals Polymer-Assisted Modification of Metal-Organic Framework MIL-96 (Al): Influence on Particle Size, Crystal Morphology and Perfluorooctanoic Acid (PFOA) Removal

2020 ◽  
Author(s):  
Luqman Hakim Mohd Azmi ◽  
Daryl R. Williams ◽  
Bradley P. Ladewig
Keyword(s):  
Particle Size ◽  
Crystal Morphology ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Synthesis Method ◽  
Perfluorooctanoic Acid ◽  
Water Soluble ◽  
Water Soluble Polymer ◽  
Metal Organic ◽  
Organic Framework

<div><b>Abstract</b></div><div>A new synthesis method was developed to prepare an aluminum-based metal organic framework (MIL-96) with a larger particle size and different crystal habits. A low cost and water-soluble polymer, hydrolyzed polyacrylamide (HPAM), was added in varying quantities into the synthesis reaction to achieve >200% particle size enlargement with controlled crystal morphology. The modified adsorbent, MIL-96-RHPAM2, was systematically characterized by SEM, XRD, FTIR, BET and TGA-MS. Using activated carbon (AC) as a reference adsorbent, the effectiveness of MIL-96-RHPAM2 for perfluorooctanoic acid (PFOA) removal from water was examined. The study confirms stable morphology of hydrated MIL-96-RHPAM2 particles as well as a superior PFOA adsorption capacity (340 mg/g) despite its lower surface area, relative to standard MIL-96. MIL-96-RHPAM2 suffers from slow adsorption kinetics as the modification significantly blocks pore access. The strong adsorption of PFOA by MIL-96-RHPAM2 was associated with the formation of electrostatic bonds between the anionic carboxylate of PFOA and the amine functionality present in the HPAM backbone. Thus, the strongly held PFOA molecules in the pores of MIL-96-RHPAM2 were not easily desorbed even after eluted with a high ionic strength solvent (500 mM NaCl). Nevertheless, this simple HPAM addition strategy can still chart promising pathways to impart judicious control over adsorbent particle size and crystal shapes while the introduction of amine functionality onto the surface chemistry is simultaneously useful for enhanced PFOA removal from contaminated aqueous systems.<br></div>

scholarly journals Polymer-Assisted Modification of Metal-Organic Framework MIL-96 (Al): Influence on Particle Size, Crystal Morphology and Perfluorooctanoic Acid (PFOA) Removal

2020 ◽  
Author(s):  
Luqman Hakim Mohd Azmi ◽  
Daryl R. Williams ◽  
Bradley P. Ladewig
Keyword(s):  
Particle Size ◽  
Crystal Morphology ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Synthesis Method ◽  
Perfluorooctanoic Acid ◽  
Water Soluble ◽  
Water Soluble Polymer ◽  
Metal Organic ◽  
Organic Framework

<div><b>Abstract</b></div><div>A new synthesis method was developed to prepare an aluminum-based metal organic framework (MIL-96) with a larger particle size and different crystal habits. A low cost and water-soluble polymer, hydrolyzed polyacrylamide (HPAM), was added in varying quantities into the synthesis reaction to achieve >200% particle size enlargement with controlled crystal morphology. The modified adsorbent, MIL-96-RHPAM2, was systematically characterized by SEM, XRD, FTIR, BET and TGA-MS. Using activated carbon (AC) as a reference adsorbent, the effectiveness of MIL-96-RHPAM2 for perfluorooctanoic acid (PFOA) removal from water was examined. The study confirms stable morphology of hydrated MIL-96-RHPAM2 particles as well as a superior PFOA adsorption capacity (340 mg/g) despite its lower surface area, relative to standard MIL-96. MIL-96-RHPAM2 suffers from slow adsorption kinetics as the modification significantly blocks pore access. The strong adsorption of PFOA by MIL-96-RHPAM2 was associated with the formation of electrostatic bonds between the anionic carboxylate of PFOA and the amine functionality present in the HPAM backbone. Thus, the strongly held PFOA molecules in the pores of MIL-96-RHPAM2 were not easily desorbed even after eluted with a high ionic strength solvent (500 mM NaCl). Nevertheless, this simple HPAM addition strategy can still chart promising pathways to impart judicious control over adsorbent particle size and crystal shapes while the introduction of amine functionality onto the surface chemistry is simultaneously useful for enhanced PFOA removal from contaminated aqueous systems.<br></div>

A microporous Cd-MOF based on a hexavalent silicon-centred connector and luminescence sensing of small molecules

2017 ◽  
Vol 41 (3) ◽  
pp. 1137-1141 ◽  
Author(s):  
Hong-Rui Tian ◽  
Chao-Ying Gao ◽  
Yang Yang ◽  
Jing Ai ◽  
Chao Liu ◽  
...  
Keyword(s):  
Small Molecules ◽  
Crystal Morphology ◽  
Metal Organic Framework ◽  
Turn On ◽  
Metal Organic ◽  
Organic Framework

A microporous metal–organic framework, built from a silicon-centered linker that is among the never documented examples, exhibits a hollow tubular crystal morphology and displays turn-on and turn-off luminescence responses for n-butanol and acetone, respectively.

scholarly journals Molecular Diffusion in a Flexible Mesoporous Metal–Organic Framework over the Course of Structural Contraction

2020 ◽  
Vol 11 (22) ◽  
pp. 9696-9701
Author(s):  
Francesco Walenszus ◽  
Volodymyr Bon ◽  
Jack D. Evans ◽  
Stefan Kaskel ◽  
Muslim Dvoyashkin
Keyword(s):  
Molecular Diffusion ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
Organic Framework

Bottom-up synthesis of 2D Co-based metal–organic framework nanosheets by an ammonia-assisted strategy for tuning the crystal morphology

CrystEngComm ◽  
2019 ◽  
Vol 21 (20) ◽  
pp. 3199-3208 ◽  
Author(s):  
Pei Nian ◽  
Haiou Liu ◽  
Xiongfu Zhang
Keyword(s):  
Crystal Morphology ◽  
Metal Organic Framework ◽  
Bottom Up ◽  
Metal Organic ◽  
Organic Framework

Two 2D Co2(bim)4 and Co(bim)(OAc) nanosheets were directly synthesized by an ammonia-modulated approach.

scholarly journals Sr/PTA Metal Organic Framework as A Drug Delivery System for Osteoarthritis Treatment

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Zhen Li ◽  
Ying Peng ◽  
Xingyu Xia ◽  
Zhe Cao ◽  
Yuqing Deng ◽  
...  
Keyword(s):  
High Performance ◽  
Crystal Morphology ◽  
Metal Organic Framework ◽  
Drug Loading ◽  
Osteoarthritis Treatment ◽  
Metal Organic ◽  
Oa Chondrocytes ◽  
Loading Amount ◽  
Organic Framework

AbstractA Sr-based metal-organic framework (MOF) is introduced as ketoprofen carrier to form a comprehensive system for treating osteoarthritis (OA), and the drug loading amount and release rate is investigated. Structural characterization of the samples showed that Sr/PTA-MOF had good crystal morphology and structure, and chemical and thermal stability. Ketoprofen was successfully loaded on the MOF carrier, which had been identified by high performance liquid chromatography (HPLC) and thermogravimetric analysis (TGA). The release experiment manifested that more than 90% of ketoprofen released from Sr/PTA-MOF after 24 h, and ketoprofen delivery was mainly governed by the Higuchi model. Furthermore, cytotoxicity experiment manifested that synthesized MOF carrier had no poisonous effect on OA chondrocytes, which provided a preliminary foundation for the realization of comprehensive treating OA.

Mechanistic Investigations into and Control of Anisotropic Metal–Organic Framework Growth

2021 ◽  
Author(s):  
Brittany L. Bonnett ◽  
Stefan Ilic ◽  
Katie Flint ◽  
Meng Cai ◽  
Xiaozhou Yang ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic ◽  
Mechanistic Investigations ◽  
And Control ◽  
Anisotropic Metal ◽  
Organic Framework
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