A silsesquioxane-based flexible polyimide aerogel with high hydrophobicity and good adsorption for liquid pollutants in wastewater

Wu, Yumin; Qiu, Hui; Sun, Jiawen; Wang, Yu-Pin; Gao, Chuanhui

doi:10.1007/s10853-020-05460-2

Cited by 13 publications

(3 citation statements)

References 37 publications

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“…Even though the interaction between the silica aerogel and the PI network is weak, the silica aerogel is less possible to drop out from the blanket owing to the encapsulation effect. Indeed, various silica-PI composite aerogels have been synthesized via different approaches, and all of them show excellent flame-retardant performances (Fan et al, 2019;Sun et al, 2020;Zhang et al, 2020;Wu et al, 2021), which indicated that the combination of PI and silica would be an effective way to improve the performance of native silica aerogels. Thus, the proposed method to synthesize the silica-PI aerogel foam blankets cannot only significantly improve its properties, but it is also possible to synthesize the aerogel blanket via a one-pot process (Figure 1B).…”

Section: Introductionmentioning

confidence: 99%

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Liu¹,

Wang²,

Liao³

et al. 2021

Front. Mater.

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A robust silica–polyimide (PI) aerogel blanket is designed and synthesized using the PI foam as the matrix and silica aerogel as the filler through an in situ method, where sol–gel transition of silica precursor occurs in pores of the PI foam, followed by the hydrophobization and ambient pressure drying. The density of the aerogel blanket ranges from 0.036 to 0.196 g/cm3, and the low density is directly controlled by tailoring the silica concentration. The specific surface area of the aerogel blanket reaches 728 m2/g. These features of the blanket result in a low thermal conductivity of 0.018 W/mK, which shows a remarkable reduction of 59% compared to that of the PI foam (0.044 W/mK). As a result, a remarkable decrease of 138°C is achieved using the silica blanket as the thermal insulator on a hot plate of approximately 250°C. In addition, the temperature degradation of the blanket is around 500°C, and up to 86% of mass remaining at 900°C is obtained. The blanket is resistant at extremely harsh conditions, e.g., 600°C for 30 min and 1,300°C for 1 min, and no open flame is observed, suggesting a significant flame-retardant of the blanket. Owing to the three-dimensional (3D) porous framework of the PI foam, the silica aerogel is encapsulated in the PI foam and the blanket exhibits strong mechanical property. The silica–PI aerogel can be reversibly compressed for 50 cycles without reduction of strain. The contact angle of the blanket is 153°, which shows a superior waterproof property. Combining with the low density, low thermal conductivity, flame-retardant, and strong mechanical strength, the aerogel blanket has the potential as an artificial island, which is safe (waterproof and flame-retardant), lightweight, comfortable, and easy to be moved.

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Section: Introductionmentioning

confidence: 99%

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Liu¹,

Wang²,

Liao³

et al. 2021

Front. Mater.

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“…However, the water transport rate of the PCS decreased to 1.33 mm s −1 when the content of the EP-POSS was increased to 50 wt%, which could be attributed to the introduction of the excessive Si-O-Si structure into the PCS. The Si-O-Si structure acts as a hydrophobic group [61], and the introduction of a small amount may lead to a faster upward escape of water molecules, while the introduction of too much may have a greater negative effect. To demonstrate that the PCS can be applied to a conditioned harsh environment without breakage, it was further placed in an ultrasonic cleaner with a power of 360 W (Video S7, Figure S7) to simulate the external environment.…”

Section: Water Transport Properties Of Pcsmentioning

confidence: 99%

Polyhedral Oligomeric Sesquioxane Cross-Linked Chitosan-Based Multi-Effective Aerogel Preparation and Its Water-Driven Recovery Mechanism

Liu,

Ma,

Shen

et al. 2024

Gels

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The use of environmentally friendly and non-toxic biomass-based interfacial solar water evaporators has been widely reported as a method for water purification in recent years. However, the poor stability of the water transport layer made from biomass materials and its susceptibility to deformation when exposed to harsh environments limit its practical application. To address this issue, water-driven recovery aerogel (PCS) was prepared by cross-linking epoxy-based polyhedral oligomeric silsesquioxane (EP-POSS) epoxy groups with chitosan (CS) amino groups. The results demonstrate that PCS exhibits excellent water-driven recovery performance, regaining its original volume within a very short time (1.9 s) after strong compression (ε > 80%). Moreover, PCS has a water absorption rate of 2.67 mm s−1 and exhibits an excellent water absorption capacity of 22.09 g g−1 even after ten cycles of absorption-removal. Furthermore, a photothermal evaporator (PCH) was prepared by loading the top layer with hydrothermally reacted tannins (HAs) and Zn2+ complexes. The results indicate that PCH achieves an impressive evaporation rate of 1.89 kg m−2 h−1 under one sun illumination. Additionally, due to the antimicrobial properties of Zn2+, PCH shows inhibitory effects against Staphylococcus aureus and Escherichia coli, thereby extending the application of solar water evaporators to include antimicrobial purification in natural waters.

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“…In recent decades, the contamination of the atmosphere, soil, and water by hazardous species has been a significant source of concern [ 1 – 3 ]. These pollutants can occur naturally in the environment, but their primary source is human activity [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Post-synthetic modification of aluminum trimesate and copper trimesate with TiO2 nanoparticles for photocatalytic applications

et al. 2022

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Organic pollutants have been a significant source of concern in recent years due to their facile dissemination and harmful effects. In this work, two different metal–organic frameworks (MOFs) were initially prepared by hydrothermal treatment, namely aluminum trimesate (MIL-100(Al)) and copper trimesate (HKUST-1). These materials were subsequently submitted to a post-synthetic modification step to grow titania nanoparticles on their surface. Anatase nanoparticles with sizes around 5 nm were successfully anchored on MIL-100(Al), and the concentration of TiO 2 in this sample was about 68 wt.%. This is the first time that this composite (TiO 2 @MIL-100(Al)) is reported in the literature. It showed an improved photocatalytic activity, removing 90% of methylene blue ( k app = 1.29 h −1 ), 55% of sodium diclofenac ( k app = 0.21 h −1 ), and 62% of ibuprofen ( k app = 0.37 h −1 ) after four hours of illumination with UV-A light. A significant concentration (14 µM) of reactive oxygen species (ROS) was detected for this composite. HKUST-1 showed a structural collapse during its post-synthetic modification, leading to a non-porous material and providing fewer sites for the heterogeneous nucleation of titania. This behavior led to a low concentration of rutile nanoparticles on HKUST-1 (9 wt.%). However, the obtained composite (TiO 2 @HKUST) also showed an improved photoactivity compared to HKUST-1, increasing the photodegradation rates evaluated for methylene blue (0.05 h −1 vs. 0.29 h −1 ), sodium diclofenac (negligible vs. 0.03 h −1 ), and ibuprofen (0.01 h −1 vs. 0.02 h −1 ). This work brings new insights concerning the preparation of photocatalysts by growing semiconductor nanoparticles on trimesate-based MOFs.

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A silsesquioxane-based flexible polyimide aerogel with high hydrophobicity and good adsorption for liquid pollutants in wastewater

Cited by 13 publications

References 37 publications

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Polyhedral Oligomeric Sesquioxane Cross-Linked Chitosan-Based Multi-Effective Aerogel Preparation and Its Water-Driven Recovery Mechanism

Post-synthetic modification of aluminum trimesate and copper trimesate with TiO2 nanoparticles for photocatalytic applications

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