Meso/microporous MOF@graphene oxide composite aerogels prepared by generic supercritical CO2 technology

Borrás, Alejandro; Rosado, Albert; Fraile, Julio; López‐Periago, Ana M.; Planas, José Giner; Yazdi, Amirali; Domingo, Concepción

doi:10.1016/j.micromeso.2022.111825

Cited by 15 publications

(8 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A scCO 2 process, schematized in Figure 1, was used for the preparation of the composite aerogels by using an ex situ approach [83] . A weighted amount of the prepared CuOZnO NPs was dispersed in a GO‐ethanol dispersion (3.5 mg mL −1 ) to obtain a 3 : 1 NP : GO weight ratio.…”

Section: Methodsmentioning

confidence: 99%

“…A scCO 2 process, schematized in Figure 1, was used for the preparation of the composite aerogels by using an ex situ approach. [83] A weighted amount of the prepared CuOZnO NPs was dispersed in a GO-ethanol dispersion (3.5 mg mL À 1 ) to obtain a 3 : 1 NP : GO weight ratio. Composite aerogels were prepared inside of a stainless steel column for straightforwardly use as a fixed-bed column in the equipment for methanol production.…”

Section: Preparation Of Cuozno@go Composite Aerogelsmentioning

confidence: 99%

See 1 more Smart Citation

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO₂

et al. 2022

Self Cite

View full text Add to dashboard Cite

A novel CuZnO multicomponent catalyst, involving reduced graphene oxide (rGO) as a support, was synthesized to be applied in the catalytic hydrogenation of CO 2 to methanol. The CuZnO@rGO composite was prepared as a 3D aerogel by a twostep process involving supercritical CO 2 for macrostructuration and H 2 treatment for reduction. Electron microscopy was applied to visualize the meso/macroporous morphology formed by the supercritical drying. The elemental mapping depicted a homogenous distribution of CuZnO nanoparticles deposited on the rGO flakes. It was demonstrated that methanol production increases for the CuZnO@rGO composite in comparison to unsupported similar CuZnO nanoparticles. This behavior was ascribed to a different interaction established between the Cu 0 and ZnO nanoparticles used as synthetized or deposited on rGO. It is shown that the highly reduced rGO component stimulates H 2 O desorption produced during the hydrogenation reaction, thus it serves as a support hindering the sintering of Cu 0 nanoparticles. The formation of a diluted surface alloy of Zn into Cu 0 was determined for the unsupported CuZnO NPs, while for the CuZnO@rGO aerogel composite, the absence of any additional phase, e. g., a surface alloy or reduced ZnO, was confirmed. The composite aerogels show excellent MeOH selectivity at high temperature (up to 260 °C) and low pressure (10 bar).

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Cuozno@go Composite Aerogelsmentioning

confidence: 99%

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO₂

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…To attain improved performance, GO has been shaped into 3D-structured sorbents, for instance, in the form of aerogels [ 15 , 16 , 17 , 18 ]. These structures can be prepared by either freeze drying (lyophilization) [ 19 , 20 ] or by supercritical CO 2 (scCO 2 ) drying [ 21 , 22 , 23 ]. Lyophilization is a process of drying in which the solvent (e.g., water) is first frozen and then eliminated from the sample by sublimation.…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide/Polyethylenimine Aerogels for the Removal of Hg(II) from Water

Borrás

Henriques

Gonçalves

et al. 2022

Gels

Self Cite

View full text Add to dashboard Cite

This article reports the synthesis of an aerogel involving reduced graphene oxide (rGO) and polyethylenimine (PEI), and describes its potential application as an effective sorbent to treat Hg(II) contaminated water. The rGO/PEI sorbent was synthetized using a supercritical CO2 method. N2 physisorption, electron microscopy, and elemental mapping were applied to visualize the meso/macroporous morphology formed by the supercritical drying. The advantages of the synthetized materials are highlighted with respect to the larger exposed GO surface for the PEI grafting of aerogels vs. cryogels, homogeneous distribution of the nitrogenated amino groups in the former and, finally, high Hg(II) sorption capacities. Sorption tests were performed starting from water solutions involving traces of Hg(II). Even though, the designed sorbent was able to eliminate almost all of the metal from the water phase, attaining in very short periods of time residual Hg(II) values as low as 3.5 µg L−1, which is close to the legal limits of drinking water of 1–2 µg L−1. rGO/PEI exhibited a remarkably high value for the maximum sorption capacity of Hg(II), in the order of 219 mg g−1. All of these factors indicate that the designed rGO/PEI aerogel can be considered as a promising candidate to treat Hg(II) contaminated wastewater.

show abstract

“…21 Some reports confirm that the combination of graphene oxide (GO) with a metal organic framework (MOF), such as ZIF-67, can not only improve electrical conductivity and stability, but also avoid aggregation and stacking of GO sheets. 22 The hydroxyl, carboxyl, and other functional groups on the surface of graphene-based materials can guide the uniform growth of MOFs on their surface. 23 Moreover GO can solve the problem of weak coordination bonding between metal nodes and organic ligands in a MOF, owing to the unique sp 2 domains of GO.…”

Section: Introductionmentioning

confidence: 99%

A highly selective molecularly imprinted electrochemical sensor with anti-interference based on GO/ZIF-67/AgNPs for the detection of p-cresol in a water environment

Han

Sun

et al. 2022

Anal. Methods

View full text Add to dashboard Cite

show abstract

Meso/microporous MOF@graphene oxide composite aerogels prepared by generic supercritical CO2 technology

Cited by 15 publications

References 52 publications

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO₂

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO₂

Graphene Oxide/Polyethylenimine Aerogels for the Removal of Hg(II) from Water

A highly selective molecularly imprinted electrochemical sensor with anti-interference based on GO/ZIF-67/AgNPs for the detection of p-cresol in a water environment

Contact Info

Product

Resources

About

Meso/microporous MOF@graphene oxide composite aerogels prepared by generic supercritical CO2 technology

Cited by 15 publications

References 52 publications

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO2

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO2

Graphene Oxide/Polyethylenimine Aerogels for the Removal of Hg(II) from Water

A highly selective molecularly imprinted electrochemical sensor with anti-interference based on GO/ZIF-67/AgNPs for the detection of p-cresol in a water environment

Contact Info

Product

Resources

About

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO₂

Role of Graphene Oxide Aerogel Support on the CuZnO Catalytic Activity: Enhancing Methanol Selectivity in the Hydrogenation Reaction of CO₂