Protein corona of metal-organic framework nanoparticals: Study on the adsorption behavior of protein and cell interaction

In this contribution we analyze the influence of adsorption cycling, crystal size, and temperature on the switching behavior of the flexible Zr-based metal–organic framework DUT-98. We observe a shift in the gate-opening pressure upon cycling of adsorption experiments for micrometer-sized crystals and assign this to a fragmentation of the crystals. In a series of samples, the average crystal size of DUT-98 crystals was varied from 120 µm to 50 nm and the obtained solids were characterized by X-ray diffraction, infrared spectroscopy, as well as scanning and transmission electron microscopy. We analyzed the adsorption behavior by nitrogen and water adsorption at 77 K and 298 K, respectively, and show that adsorption-induced flexibility is only observed for micrometer-sized crystals. Nanometer-sized crystals were found to exhibit reversible type I adsorption behavior upon adsorption of nitrogen and exhibit a crystal-size-dependent steep water uptake of up to 20 mmol g−1 at 0.5 p/p 0 with potential for water harvesting and heat pump applications. We furthermore investigate the temperature-induced structural transition by in situ powder X-ray diffraction. At temperatures beyond 110 °C, the open-pore state of the nanometer-sized DUT-98 crystals is found to irreversibly transform to a closed-pore state. The connection of crystal fragmentation upon adsorption cycling and the crystal size dependence of the adsorption-induced flexibility is an important finding for evaluation of these materials in future adsorption-based applications. This work thus extends the limited amount of studies on crystal size effects in flexible MOFs and hopefully motivates further investigations in this field.

Download Full-text

Adsorption behavior of a metal organic framework of University in Oslo 67 and its application to the extraction of sulfonamides in meat samples

Journal of Chromatography A ◽

10.1016/j.chroma.2020.460949 ◽

2020 ◽

Vol 1619 ◽

pp. 460949 ◽

Cited By ~ 3

Author(s):

Lian Xia ◽

Yanan Dou ◽

Jie Gao ◽

Yumeng Gao ◽

Wenjing Fan ◽

...

Keyword(s):

Metal Organic Framework ◽

Adsorption Behavior ◽

Metal Organic ◽

Meat Samples ◽

Organic Framework

Download Full-text

Adsorption behavior of methyl orange onto an aluminum-based metal organic framework, MIL-68(Al)

Water Science & Technology ◽

10.2166/wst.2017.154 ◽

2017 ◽

Vol 75 (12) ◽

pp. 2800-2810 ◽

Cited By ~ 13

Author(s):

Shi-chuan Wu ◽

Xia You ◽

Cao Yang ◽

Jian-hua Cheng

Keyword(s):

Methyl Orange ◽

Adsorption Isotherm ◽

Electrostatic Interactions ◽

Metal Organic Framework ◽

Dye Adsorption ◽

Adsorption Behavior ◽

Metal Organic ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Organic Framework

MIL-68(Al), a powdered aluminum-based metal organic framework (MOF), was synthesized and used to explore its adsorption behavior toward methyl orange (MO). The adsorption isotherm, thermodynamics, kinetics, and some key operating factors as well as changes in the material's structure were investigated. The adsorption isotherm conformed to the Langmuir isotherm model and the maximum equilibrium adsorption capacity was 341.30 mg g−1. Thermodynamic data demonstrated that the adsorption process was spontaneous, endothermic and showed positive entropy. For kinetics, the process of MO adsorption onto MIL-68(Al) was more suitably described by a pseudo-second-order model. Electrostatic and hydrogen-bonding interactions contributed to dye adsorption, with electrostatic interactions considered to be the principal binding force between adsorbent and adsorbate. Furthermore, MIL-68(Al) maintained a stable structure after adsorption. From these results, MIL-68(Al) was suggested here to be a stable MOF adsorbent for removing MO from aqueous solution.

Download Full-text

Molecular separations with breathing metal–organic frameworks: modelling packed bed adsorbers

Dalton Transactions ◽

10.1039/c6dt00258g ◽

2016 ◽

Vol 45 (10) ◽

pp. 4416-4430 ◽

Cited By ~ 12

Author(s):

Tom R. C. Van Assche ◽

Gino V. Baron ◽

Joeri F. M. Denayer

Keyword(s):

Metal Organic Framework ◽

Metal Organic Frameworks ◽

Packed Bed ◽

Adsorption Behavior ◽

General Strategy ◽

Metal Organic ◽

Column Separations ◽

Molecular Separations ◽

Organic Framework

This work proposes a general strategy to model the adsorption behavior of phase changing metal–organic framework (MOF) adsorbents during column separations.

Download Full-text

Photoinduced-electron-transfer-driven surface modification to regulate adsorption behavior in a pyridinium-decorated metal–organic framework

Chemical Communications ◽

10.1039/c9cc06416h ◽

2019 ◽

Vol 55 (85) ◽

pp. 12829-12832 ◽

Cited By ~ 5

Author(s):

Xiao-Dong Yang ◽

Na Gao ◽

Shuai Ma ◽

Jing-Wang Cui ◽

Meng-Ze Jia ◽

...

Keyword(s):

Electron Transfer ◽

Surface Modification ◽

Photoinduced Electron Transfer ◽

Metal Organic Framework ◽

Adsorption Behavior ◽

Polar Molecules ◽

Adsorption Behaviors ◽

Metal Organic ◽

Organic Framework

Photoinduced-electron-transfer-driven surface modification was presented in a pyridinium-decorated metal–organic framework and found to be effective to regulate its adsorption behaviors toward polar molecules and halogens.

Download Full-text