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

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Welding partially reduced graphene oxides by MOFs into micro–mesoporous hybrids for high-performance oil absorption
RSC Advances ( IF 3.9 ) Pub Date : 2021-09-20 , DOI: 10.1039/d1ra05644a
Lu Sun ₁ , Jun Tang ₁

Affiliation

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.

中文翻译：

通过 MOF 将部分还原的氧化石墨烯焊接成微介孔杂化材料以实现高性能吸油

在 UiO-66- 的合成过程中，边缘保留少量 COOH 基团的部分还原氧化石墨烯（PRGO）被 UiO-66-NH ₂纳米颗粒联锁成分层多孔杂化物（PRGO@UiO-66-NH ₂ ）。 PRGO存在下的NH ₂ ，其中UiO-66-NH ₂纳米颗粒提供微孔，联锁的PRGO骨架提供介孔。与GO@UiO-66-NH ₂杂化物和UiO-66-NH ₂纳米粒子相比，PRGO@UiO-66-NH ₂杂化物上的官能团峰强度大大降低，并且-COOH的数量也减少了。还原后 PRGO 的边缘约为 6.3%，FT-IR 和 XPS 结果证实了这一点。当PRGO@UiO-66-NH ₂杂化物通过氢键嵌入其大孔中时，三聚氰胺泡沫（MF）能够有效地吸收油/水双相混合物中的各种与水不混溶的有机溶剂，同时，由于Cassie态表面超疏水性而抑制水渗入，在空气中水接触角为154.2°。经过10次循环后，PRGO@UiO-66-NH ₂负载的MFs的水接触角为148.3°，这表明复合MFs在10次循环后具有优异的稳定性和回收能力。 PRGO@UiO-66-NH ₂负载的MF具有吸收剂干质量的％3E10 000wt％的吸油能力和≈1的吸水能力。76 wt% 的吸附物，从而突出了油相对于水的高吸收选择性。

更新日期：2021-09-20

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