Construction of super resilience graphene composite aerogels with efficient oil-water separation and formaldehyde removal, and its application for high performance urea-formaldehyde foam

IF 9.8 1区工程技术 Q1 ENGINEERING, CHEMICAL Desalination Pub Date : 2025-06-01 Epub Date: 2025-02-15 DOI:10.1016/j.desal.2025.118702

Buyong Wu , Chiyu Xu , Wenjie Chu , Yingguo Zhou

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Abstract

Graphene aerogel (GA) holds great potentials for treating oil-water mixtures and formaldehyde removal, while the fragile mechanical performances restrict its further development. Herein, epoxy terminated poly-(dimethylsiloxane) (PDMS) and polyurethane (PU) were grafted onto the amine-functionalized carbon nanotube (CNT) surface (CNT-PDMS-PU) sequentially, and multifunctional CNT-PDMS-PU@GA (CPPGA) was prepared through hydrothermal self-assembly and freeze-drying. Due to the tailored strong interfacial bonding, CNT-PDMS-PU acted as threads to stitch GO sheets together, and CNT-PDMS-PU was intercalated into GO layers to avoid serious restacking, constructing interconnected porous network with large specific surface area for CPPGA. Thus, enhanced compressive strength (256.13 kPa) and recoverability (90 % compressive strain), efficient oil-water separation, and excellent formaldehyde adsorption capacity (523.32 mg/g) based on chemical-physical adsorption effect were achieved for CPPGA. Besides, CPPGA powder was introduced to urea-formaldehyde (UF) prepolymer resin to prepare UF/CPPGA composite foam, which exhibited very low free formaldehyde emission and durable hydrophobicity with low water absorption ratio, showing promising application prospect in the field of building insulation. Such mechanically robust multifunctional composite graphene aerogel further burgeoned research interest for practical application.

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具有高效油水分离和甲醛去除功能的超弹性石墨烯复合气凝胶的构建及其在高性能脲醛泡沫中的应用

石墨烯气凝胶（GA）在处理油水混合物和去除甲醛方面具有很大的潜力，但其脆弱的力学性能限制了其进一步发展。将环氧端部聚二甲基硅氧烷（PDMS）和聚氨酯（PU）依次接枝到胺功能化碳纳米管（CNT）表面（CNT-PDMS-PU），通过水热自组装和冷冻干燥制备多功能CNT-PDMS-PU@GA （CPPGA）。由于定制的强界面结合，CNT-PDMS-PU作为线将氧化石墨烯片缝合在一起，并将CNT-PDMS-PU嵌入氧化石墨烯层中以避免严重的再堆积，为CPPGA构建了具有大比表面积的互连多孔网络。因此，在化学物理吸附的基础上，CPPGA获得了更高的抗压强度（256.13 kPa）和可恢复性（90%压缩应变），高效的油水分离和优异的甲醛吸附量（523.32 mg/g）。此外，将CPPGA粉末掺入脲醛预聚树脂中制备脲醛预聚树脂/CPPGA复合泡沫材料，该材料具有游离甲醛释放量极低、吸水率低、耐久的疏水性，在建筑保温领域具有广阔的应用前景。这种机械坚固的多功能复合石墨烯气凝胶进一步激发了实际应用的研究兴趣。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.