Multifunctional nano-cellulose aerogel for efficient oil–water separation: Vital roles of magnetic exfoliated bentonite and polyethyleneimine

Tang, Rui; Xu, Shiqi; Ya, HU; Wang, Junhui; Lu, Caimei; Wang, Linxing; Zhou, Zhen; Liao, Dankui; Zhang, Hanbing; Tong, Zhangfa

doi:10.1016/j.seppur.2023.123557

Cited by 22 publications

(5 citation statements)

References 80 publications

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“…Furthermore, the structures of the P(HEA-AA)/PEI/Gly gel were investigated by Fourier-transform infrared (FT-IR) spectroscopy and scanning electron microscope (SEM). As shown in Figure S1, the wide peak at 3425 cm –1 corresponded to the overlap of the N–H and O–H stretching vibrations in PEI, HEA, and AA, and the peaks at 2952 and 2886 cm –1 were attributed to the asymmetric and symmetric stretching vibrations of −CH 2 – in PEI and HEA. − The stretching vibration of CO in HEA and AA was observed at 1725 cm –1 . At the same time, the bending vibration peak of the amine group (−NH 2 or −NH) peaks in PEI at 1572 cm –1 shifted to 1556 cm –1 in the P(HEA-AA)/PEI/Gly gel, indicating that PEI, AA, and HEA were cross-linked by physical interactions such as hydrogen bonding and electrostatic interaction instead of covalent bonding.…”

Section: Resultsmentioning

confidence: 88%

A Superior Self-Adhesive, Self-Healing, and Anti-Freezing Gel toward Flexible Sensor Applications in Extreme Conditions

Feng,

Zhang,

et al. 2024

ACS Appl. Electron. Mater.

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As an important part of flexible wearable electronics, hydrogel sensors have aroused great interest. However, two serious issues, low self-healing efficiency and terrible environmental adaptability, have largely limited the development of hydrogel sensors. Herein, a versatile gel elastomer (P(HEA-AA)/PEI/Gly) is synthesized via introducing polyethylenimine (PEI), 2-hydroxyethyl acrylate (HEA), and acrylic acid (AA) into a glycerin/water binary solvent system, which exhibits high stretchability (1427% elongation), outstanding self-healing efficiency (95%), and exceptional low-temperature adaptability (−35 °C) as well as robust self-adhesion. Meanwhile, the assembled P(HEA-AA)/PEI/Gly gel sensor possesses reliable sensitivity, wide strain range, and long-term cycling stability, which can not only precisely monitor different mechanical deformations (stretching, twisting, and bending) but also specifically distinguish the human activities in the opposite direction. In particular, even in an extremely cold environment of −35 °C, the gel sensor still can withstand large mechanical damages caused by external factors and restore its sensing capability. This feature inspires us to construct a wearable communication device with a low-temperature self-healing function that can accurately deliver various valuable information to the receiver under extreme conditions, such as "Warn", "Cold", and "Dangerous". This work provides a feasible method to construct excellent self-healing and temperature tolerant gel sensors and paves the way for versatile applications in electronic skin, artificial intelligence, and soft robotics.

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Section: Resultsmentioning

confidence: 88%

A Superior Self-Adhesive, Self-Healing, and Anti-Freezing Gel toward Flexible Sensor Applications in Extreme Conditions

Feng,

Zhang,

et al. 2024

ACS Appl. Electron. Mater.

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“…To data, a majority of biomass aerogels still present crucial limitations on structural and mechanical stability. As illustrated in Table 1 , the existing biomass aerogels have a maximum compressive stress of 3.5–55 kPa, and many of them have the problem of structural instability and plastic deformation exceeding 15%, such as dialdehyde carboxymethyl cellulose aerogels (<10 kPa, 15–20% plastic deformation after 50 cycles) [ 35 ], cellulose nanocrystals/PVA aerogels (<35 kPa, >15% plastic deformation after 50 cycles) [ 36 ], cellulose nanofibrils/N-alkylated chitosan/poly(vinyl alcohol) aerogels (<55 kPa, but the maximum stress will reduce to 17 kPa after 50 cycles, 18–20% plastic deformation) [ 37 ], seed hairs of typha orientalis aerogels (<25 kPa, 14.8% plastic deformation after 10 cycles) [ 38 ], and so on. The excellent rebound property of the S-PC/CS is primarily attributed to the unique sheet structure.…”

Section: Resultsmentioning

confidence: 99%

Biomass Chitosan-Based Tubular/Sheet Superhydrophobic Aerogels Enable Efficient Oil/Water Separation

Wang

Lin

Guo

et al. 2023

Gels

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Water pollution, which is caused by leakage of oily substances, has been recognized as one of the most serious global environmental pollutions endangering the ecosystem. High-quality porous materials with superwettability, which are typically constructed in the form of aerogels, hold huge potential in the field of adsorption and removal of oily substances form water. Herein, we developed a facile strategy to fabricate a novel biomass absorbent with a layered tubular/sheet structure for efficient oil/water separation. The aerogels were fabricated by assembling hollow poplar catkin fiber into chitosan sheets using a directional freeze-drying method. The obtained aerogels were further wrapped with -CH3-ended siloxane structures using CH3SiCl3. This superhydrophobic aerogel (CA ≈ 154 ± 0.4°) could rapidly trap and remove oils from water with a large sorption range of 33.06–73.22 g/g. The aerogel facilitated stable oil recovery (90.07–92.34%) by squeezing after 10 sorption-desorption cycles because of its mechanical robustness (91.76% strain remaining after 50 compress-release cycles). The novel design, low cost, and sustainability of the aerogel provide an efficient and environmentally friendly solution for handling oil spills.

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“…This characteristic facilitates the binding of methanol with no need for extra pretreatment steps. , Therefore, it was hypothesized that the incorporation of methanol into bentonite-layered subunits would result in the formation of a multifunctional hybrid framework with enhanced physicochemical properties . Moreover, during the past several decades, substantial advancements have been made in the field of the morphological transformation processes of clay, particularly in the area of separating or exfoliating the layered clay structures into discrete silicate sheets that possess two-dimensional geometrical structures. , The utilization of this approach has led to beneficial effects in the production of innovative nanostructures comprised of clay minerals, which demonstrate significant characteristics including considerable biological activity, adsorption potential, oxidation properties, surface reactivity, surface area, and dispersion properties. ,, Therefore, the formation of methoxy forms of the exfoliated bentonite nanosheets will result in highly promising adsorbents for a variety of soluble water pollutants.…”

Section: Introductionmentioning

confidence: 99%

“… 39 , 40 The utilization of this approach has led to beneficial effects in the production of innovative nanostructures comprised of clay minerals, which demonstrate significant characteristics including considerable biological activity, adsorption potential, oxidation properties, surface reactivity, surface area, and dispersion properties. 38 , 41 , 42 Therefore, the formation of methoxy forms of the exfoliated bentonite nanosheets will result in highly promising adsorbents for a variety of soluble water pollutants.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Retention of Cd(II) by Exfoliated Bentonite and Its Methoxy Form: Steric and Energetic Studies

Abukhadra,

Nasser,

El-Sherbeeny

et al. 2024

ACS Omega

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Synergistic studies were conducted to evaluate the retention potentiality of exfoliating bentonite (EXBEN) as well as its methanol hybridization derivative (Mth/EXBEN) toward Cd(II) ions to be able to verify the effects of the transformation processes. The adsorption characteristics were established by considering the steric and energetic aspects of the implemented advanced equilibrium simulation, specifically the monolayer model with a single energy level. Throughout the full saturation states, the adsorption characteristics of Cd(II) increased substantially to 363.7 mg/g following the methanol hybridized treatment in comparison to EXBEN (293.2 mg/g) as well as raw bentonite (BEN) (187.3 mg/g). The steric analysis indicated a significant rise in the levels of the active sites following the exfoliation procedure [retention site density (N m ) = 162.96 mg/g] and the chemical modification with methanol [retention site density (N m ) = 157.1 mg/g]. These findings clarify the improvement in the potential of Mth/EXBEN to eliminate Cd(II). Furthermore, each open site of Mth/EXBEN has the capacity to bind approximately three ions of Cd(II) in a vertically aligned manner. The energetic investigations, encompassing the Gaussian energy (less than 8 kJ/mol) plus the adsorption energy (less than 40 kJ/mol), provide evidence of the physical sequestration of Cd(II). This process may involve the collaborative impacts of dipole binding forces (ranging from 2 to 29 kJ/mol) and hydrogen binding (less than 30 kJ/mol). The measurable thermodynamic functions, particularly entropy, internal energy, and free enthalpy, corroborate the exothermic and spontaneous nature of Cd(II) retention by Mth/ EXBEN, as opposed to those by EXBEN and BE.

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Multifunctional nano-cellulose aerogel for efficient oil–water separation: Vital roles of magnetic exfoliated bentonite and polyethyleneimine

Cited by 22 publications

References 80 publications

A Superior Self-Adhesive, Self-Healing, and Anti-Freezing Gel toward Flexible Sensor Applications in Extreme Conditions

A Superior Self-Adhesive, Self-Healing, and Anti-Freezing Gel toward Flexible Sensor Applications in Extreme Conditions

Biomass Chitosan-Based Tubular/Sheet Superhydrophobic Aerogels Enable Efficient Oil/Water Separation

Enhanced Retention of Cd(II) by Exfoliated Bentonite and Its Methoxy Form: Steric and Energetic Studies

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