Issue 49, 2021

Welding partially reduced graphene oxides by MOFs into micro–mesoporous hybrids for high-performance oil absorption

Abstract

Partially reduced graphene oxides (PRGOs) with a small number of COOH groups remaining at the edges were interlocked by UiO-66-NH2 nanoparticles into hierarchical porous hybrids (PRGO@UiO-66-NH2) during the synthesis of UiO-66-NH2 in the presence of PRGOs, in which the UiO-66-NH2 nanoparticles provide micropores and the interlocked PRGO skeletons provide mesopores. The peak intensity of the functional groups on the PRGO@UiO-66-NH2 hybrids decrease greatly when compared with the GO@UiO-66-NH2 hybrids and the UiO-66-NH2 nanoparticles, and the number of –COOH at the edge of the PRGOs are approximately 6.3% after reduction, which is confirmed by the FT-IR and XPS results. When the PRGO@UiO-66-NH2 hybrids were embedded in their macropores via hydrogen bonding, melamine foams (MFs) were able to effectively absorb a variety of water-immiscible organic solvents from oil/water biphasic mixtures and, at the same time, suppress water infusion due to Cassie-state surface superhydrophobicity with a water contact angle of 154.2° in air. After 10 cycles, the PRGO@UiO-66-NH2-laden MFs exhibited water contact angles of 148.3°, which indicated that the composite MFs had excellent stability and recycling ability after 10 cycles. The PRGO@UiO-66-NH2-laden MFs had an oil absorption capacity of >10 000 wt% of the dry mass of absorbents and water absorption capacity of ≈1.76 wt% of the adsorbate, thus highlighting the high absorption selectivity of oil over water.

Graphical abstract: Welding partially reduced graphene oxides by MOFs into micro–mesoporous hybrids for high-performance oil absorption

Supplementary files

Article information

Article type
Paper
Submitted
23 Jul 2021
Accepted
06 Sep 2021
First published
20 Sep 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 30980-30989

Welding partially reduced graphene oxides by MOFs into micro–mesoporous hybrids for high-performance oil absorption

L. Sun and J. Tang, RSC Adv., 2021, 11, 30980 DOI: 10.1039/D1RA05644A

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