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

2017 ◽  
Vol 75 (12) ◽  
pp. 2800-2810 ◽  
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.

Highly efficient methyl orange adsorption by UV-012, a new crystalline Co(ii) MOF

CrystEngComm ◽  
2021 ◽  
Author(s):  
Daniel J. Ramírez ◽  
Luis A. Alfonso Herrera ◽  
Raúl Colorado-Peralta ◽  
Rodolfo Peña Rodríguez ◽  
P. K. Camarillo Reyes ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Methyl Orange ◽  
Metal Organic Framework ◽  
Dye Adsorption ◽  
Anionic Dye ◽  
Highly Efficient ◽  
New Material ◽  
Metal Organic ◽  
Organic Framework

This work presents three scientific contributions: the new metal organic framework (UV-012) crystal structure, the evaluation of this new material for dye adsorption and a new mechanism that explains the excellent and selective anionic dye adsorption by this material.

A 2-Fold Interpenetrated Nitrogen-Rich Metal–Organic Framework: Dye Adsorption and CO2 Capture and Conversion

2021 ◽  
Author(s):  
Xiao-Li Yang ◽  
Yang-Tian Yan ◽  
Wen-Juan Wang ◽  
Ze-Ze Hao ◽  
Wen-Yan Zhang ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Metal Organic Framework ◽  
Dye Adsorption ◽  
Metal Organic ◽  
Organic Framework

Enhanced Dye Adsorption of Mixed‐Matrix Membrane by Covalent Incorporation of Metal‐Organic Framework with Poly(styrene‐ alt ‐maleic anhydride)

2021 ◽  
Vol 6 (19) ◽  
pp. 4689-4697
Author(s):  
Xuan Thang Cao ◽  
The Ky Vo ◽  
Tran Nguyen Minh An ◽  
Trinh Duy Nguyen ◽  
Daniel Manaye Kabtamu ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Metal Organic Framework ◽  
Dye Adsorption ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Metal Organic ◽  
Organic Framework

Divergent Adsorption Behavior Controlled by Primary Coordination Sphere Anions in the Metal–Organic Framework Ni2X2BTDD

2021 ◽  
Author(s):  
Julius J. Oppenheim ◽  
Jenna L. Mancuso ◽  
Ashley M. Wright ◽  
Adam J. Rieth ◽  
Christopher H. Hendon ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Metal Organic Framework ◽  
Adsorption Behavior ◽  
Metal Organic ◽  
Organic Framework

scholarly journals Photocatalytic Degradation of Methylene Blue and Methyl Orange by Y-PTC Metal-Organic Framework

2021 ◽  
Vol 7 (2) ◽  
pp. 129-141
Author(s):  
Adawiah Adawiah ◽  
Muhammad Derry Luthfi Yudhi ◽  
Agustino Zulys
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Metal Organic Framework ◽  
Light Irradiation ◽  
Bandgap Energy ◽  
Metal Organic ◽  
Organic Framework

The yttrium based metal-organic framework (MOF) Y-PTC was synthesized by the solvothermal method using perylene as the linker and yttrium as metal ion. This study aims to assess the photocatalytic activity of yttrium-perylenetetracarboxylate (Y-PTC) metal-organic framework (MOF) toward methylene blue and methyl orange under visible light irradiation. The results of the FTIR analysis showed that Y-PTC MOF had a different structure and composition from its precursor (Na4PTC). The Y-PTC MOF has a bandgap energy value of 2.20 eV with a surface area of 47.7487 m2/g. The SEM-EDS analysis showed an elemental composition of yttrium, carbon, and oxygen, were 6.9%, 72.1% and 20.7%, respectively. Furthermore, Y-PTC MOF was able to adsorb dyes at the optimum by 78.10% and 35.57% toward methylene blue (MB) and methyl orange (MO) at the dispersion period of 60 mins. Y-PTC MOF exhibited photocatalytic activity towards the degradation of methylene blue and methyl orange under visible light irradiation. The addition of H2O2 inhibited Y-PTC photocatalytic activity towards MO degradation from 50.89% to 26.38%. In contrast to MO, the addition of H2O2 had a positive effect on MB, which increased the degradation from 87.56% to 91.65%. Therefore, Y-PTC MOF possessed the potential of a photocatalyst material in dyes degradation under visible light irradiation.

scholarly journals The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98

2019 ◽  
Vol 10 ◽  
pp. 1737-1744 ◽  
Author(s):  
Simon Krause ◽  
Volodymyr Bon ◽  
Hongchu Du ◽  
Rafal E Dunin-Borkowski ◽  
Ulrich Stoeck ◽  
...  
Keyword(s):  
Crystal Size ◽  
Metal Organic Framework ◽  
Adsorption Behavior ◽  
Switching Behavior ◽  
Type I ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
The Impact ◽  
Organic Framework

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.

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