Fabrication of ZIF-9@super-macroporous microsphere for adsorptive removal of Congo red from water

Dai, Juan; Xiao, Shangzhen; Liu, Jing; He, Jing; Lei, Jiandu; Wang, Luying

doi:10.1039/c6ra26763g

Cited by 30 publications

(9 citation statements)

References 51 publications

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“…The type IV isotherm for ZIF‐9(NH 2 ) along with a hysteresis loop at P/P 0 = 0.85–1 with an abrupt increase of gas adsorption at the mentioned relative pressures denoted the mesopores and macropores of the material . The specific surface area of ZIF‐9(NH 2 ) calculated by the BET method was 407 m 2 .g −1 . The BET surface area was substantially decreased upon the inclusion of PTA species (342 m 2 .g −1 ), which may indicate the presence of guest components supported on the ZIF‐9(NH 2 ) framework.…”

Section: Resultssupporting

confidence: 90%

Phosphotungstic acid grafted zeolite imidazolate framework as an effective heterogeneous nanocatalyst for the one‐pot solvent‐free synthesis of 3,4‐dihydropyrimidinones

Tayebee

Abdizadeh

Erfaninia

et al. 2019

Applied Organom Chemis

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Phosphotungstic acid (H 3 PW 12 O 40 , PTA) supported on ZIF-9(NH 2 ) was synthesized for the first time and performed as an effective and environmental friendly catalyst in the one-pot three component Biginelli condensation of different substituted benzaldehydes with ethyl acetoacetate and urea to afford the corresponding 3,4-dihydropyrimidin-2-(1H)-ones under solvent-free conditions. ZIF-9(NH 2 ) and the prepared nanocatalyst PTA@ZIF-9(NH 2 ) were characterized by XRD, FESEM, TEM, EDX, BET, AAS, TGA, UV-Vis, and FT-IR. After reaction, the nanocatalyst can be easily separated from the reaction mixture by centrifuge and the recovered catalyst can be reused for at least five times with a 14% reduction in yield after the fifth run. This study showed that ZIF-9(NH 2 ) can be utilized as a promising support for PTA and developed a highly active, stable and reusable heterogeneous catalyst under easy reaction condition in the multi-component organic synthesis.

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Section: Resultssupporting

confidence: 90%

Phosphotungstic acid grafted zeolite imidazolate framework as an effective heterogeneous nanocatalyst for the one‐pot solvent‐free synthesis of 3,4‐dihydropyrimidinones

Tayebee

Abdizadeh

Erfaninia

et al. 2019

Applied Organom Chemis

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“…The KC demonstrated the highest adsorption capacity by removing >98% of CR after 10 min À1 of contact. The removal of CR from aqueous solutions by polyhedral Cu 2 O nanoparticles and ZIF-9@supermacroporous microsphere have been reported by Shu et al [6] and Dai et al, [7] respectively. Diouri et al [8] also investigated the adsorption of CR onto marble dust.…”

Section: Introductionmentioning

confidence: 94%

“…The standard free energy (ΔG ), enthalpy (ΔH ), and entropy (ΔS ) changes were calculated from the Gibb's free energy and van't Hoff equations (Eqs. [7][8][9][10]). [20] K…”

Section: Thermodynamicsmentioning

confidence: 99%

Accelerated Decolorization of Congo Red by Powdered Termite Mound

Ayanda

Odo

Malomo

et al. 2017

CLEAN Soil Air Water

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The decolorization of congo red (CR) in aqueous solution is investigated in a batch mode using termite mound as an adsorbent. Elemental analysis and identification of the mineral composition/phases in the termite mound sample is carried out by means of X‐ray fluorescence and X‐ray diffraction. The optimal percentage removal and equilibrium adsorption capacity of CR by the termite mound achieved is found to be 95.68% and 2.30 mg g−1, respectively, when 0.5 g of termite mound is added to 30 mL of 40 mg L−1 CR for 60 min−1 at 400 rpm. The decolorization of CR increases with an increase in the termite mound dosage, contact time, stirring speed, pH, and temperature; however, the adsorption capacity decreases with an increase in the initial CR concentration. The adsorption process shows that CR obeys the Freundlich adsorption model with a 0.9355 coefficient of regression, denoting multilayer formation onto the termite mound. The adsorption kinetics follow the pseudo‐second‐order model with a coefficient of regression value of 0.9966, showing that chemisorption is the main rate limiting step. ΔG is negative, an indication that the adsorption of CR onto termite mound is spontaneous. Approximately 86.6% chemical oxygen demand reduction is achieved with real textile wastewater. This study shows how termite mound can be harnessed for the treatment of textile wastewater before discharged into the environment.

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“…Flexible MOF composites that incorporate polymer matrices are deformable and have been used to create wearables, implantable sensors, self-folding actuators, supercapacitors, , and in applications requiring large deformation or resistance to deformation. , However, conventional fabrication methods for MOF–polymer composites such as molding, electrospinning, and surface coating have limited shape complexity and have been used to define primarily simple shapes such as films, , filaments, , and microspheres …”

Section: Introductionmentioning

confidence: 99%

3D Printing of an In Situ Grown MOF Hydrogel with Tunable Mechanical Properties

Liu

Erol

Gracias

2020

ACS Appl. Mater. Interfaces

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Due to their precisely modifiable microporosity and chemical functionality, Metal–Organic Frameworks (MOFs) have revolutionized catalysis, separations, gas storage, drug delivery, and sensors. However, because of their rigid and brittle powder morphology, it is challenging to build customizable MOF shapes with tunable mechanical properties. Here, we describe a new three-dimensional (3D) printing approach to create stretchable and tough MOF hydrogel structures with tunable mechanical properties. We formulate a printable ink by combining prepolymers of a versatile double network (DN) hydrogel of acrylamide and alginate, a shear-thinning agent, and MOF ligands. Importantly, by simultaneous cross-linking of alginate and in situ growth of the HKUST-1 using copper ions, we are able to create composites with high MOF dispersity in the DN hydrogel matrix with high pore accessibility. We extensively characterize the inks and uncover parameters to tune modulus, strength, and toughness of the 3D prints. We also demonstrate the excellent performance of the MOF hydrogels for dye absorption. Our approach incorporates all of the advantageous attributes of 3D printing while offering a rational approach to merge stretchable hydrogels and MOFs, and our findings are of broad relevance to wearables, implantable and flexible sensors, chemical separations, and soft robotics.

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Fabrication of ZIF-9@super-macroporous microsphere for adsorptive removal of Congo red from water

Abstract: A novel composite adsorbent of ZIF-9 nanoparticles growing on super-macroporous microspheres (SMM) was synthesized via in situ growth method for adsorptive removal of Congo red from water.

Cited by 30 publications

References 51 publications

Phosphotungstic acid grafted zeolite imidazolate framework as an effective heterogeneous nanocatalyst for the one‐pot solvent‐free synthesis of 3,4‐dihydropyrimidinones

Phosphotungstic acid grafted zeolite imidazolate framework as an effective heterogeneous nanocatalyst for the one‐pot solvent‐free synthesis of 3,4‐dihydropyrimidinones

Accelerated Decolorization of Congo Red by Powdered Termite Mound

3D Printing of an In Situ Grown MOF Hydrogel with Tunable Mechanical Properties

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