Preparation of cellulose triacetate aerogel via non‐solvent impacted thermally induced phase separation for oil absorption

Most ingredients used to construct porous substrate of hydrophobic magnetic absorbent for oil/water separation are toxic, environmentally incompatible and difficult to degrade. With the purpose of solving this problem, a magnetic chitosan (CS)‐based aerogel decorated with polydimethylsiloxane (PDMS) was successfully fabricated in this work. The magnetic porous substrate was built by the electrostatic interactions between CS, itaconic acid and Fe3O4 nanoparticles (FeNPs) in water solution, followed by a freeze‐drying process. The hydrophobic properties were rendered to the substrate by the crosslinking reaction of PDMS. Owing to the low density (0.0655 g/cm3) and high porosity (92%), the prepared aerogel displayed high absorption capacities (8.89–22.38 g/g) towards the testing organic liquids. The silylation process provided the aerogel with excellent hydrophobic properties (water contact angle, 147.1°), resulting in selectively absorbing oil from immiscible oil/water mixture and water‐in‐oil emulsion. Due to the uniformly distributed FeNPs, the remote control of the aerogel by external magnetic field was acquired, the saturation magnetization of which was 11.22 emu/g. Furthermore, the aerogel could also continuously separate heavy oil from water by acting as filter. The experimental results indicate that this renewable, environmentally benign and bifunctional aerogel has great potential in oily wastewater remediation.

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“…The absorption capacities 46 of the aerogel for a series of organic liquids were measured as

italicAbsorption capacity = ((), m_{1} - m_{0}) / m_{0},

where m 0 and m 1 are the weights (g) of the aerogel before and after absorption, respectively.…”

Section: Methodsmentioning

confidence: 99%

Magnetic chitosan‐based aerogel decorated with polydimethylsiloxane: A high‐performance scavenger for oil in water

Yin

Liu

Bao

et al. 2021

J of Applied Polymer Sci

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“…The thermodynamics and kinetics during TIPS membrane preparation have been studied, but the mass transfer has been ignored in many cases. 30,31 In the fabrication of hollow fiber membranes, the polymer solution spun out of the nozzle is difficult to be controlled using just air bath to cool. Liquid quenching baths with different temperatures are often employed to induce phase separation since it is easier to control membrane shape.…”

Section: Alberto Figolimentioning

confidence: 99%

Recent advances in polymer membranes employing non-toxic solvents and materials

et al. 2021

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“…Meanwhile, membrane separation with its low energy consumption, ease of operation, and continuous separation is considered the most favorable chiral separation technique. [32][33][34][35] CTA membranes are extensively utilized in diverse applications, including desalination, [36][37][38][39] wastewater treatment, [40][41][42] and gas separation, 43,44 owing to their straightforward fabrication, high durability and stability. The six-membered ring of the CTA backbone contains chiral carbons, thus potentially enabling CTA to facilitate chiral recognition.…”

Section: Introductionmentioning

confidence: 99%

“…CTA membranes are extensively utilized in diverse applications, including desalination, 36–39 wastewater treatment, 40–42 and gas separation, 43,44 owing to their straightforward fabrication, high durability and stability. The six‐membered ring of the CTA backbone contains chiral carbons, thus potentially enabling CTA to facilitate chiral recognition 27 .…”

Section: Introductionmentioning

confidence: 99%

Chiral separation of D,L‐phenylglycine by cellulose triacetate membranes

Zhao,

Cui,

Yuan

2024

J of Applied Polymer Sci

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Enantiopure pharmaceuticals are especially important in medicinal applications. Phenylglycine, as a critical pharmaceutical intermediate, is often utilized in single enantiomeric form for drug synthesis. Chiral membrane separation offers advantages such as simple operation, low energy consumption, and scalability, holding great potential for chiral drug separations. In this work, cellulose triacetate (CTA) membranes are prepared via phase inversion and used for permeation experiments driven by a concentration gradient to investigate selective permeation of D,L‐phenylglycine solutions. Scanning electron microscopy reveals surface and cross‐sectional morphologies of the fabricated membranes. After single‐factor optimization, the CTA membrane exhibits an enantiomeric excess of 68.94% for D,L‐phenylglycine separation. The membrane maintains its selective permeation capability after repeated use. This indicates the CTA membrane has favorable chiral selective permeation for D,L‐phenylglycine solutions with stable performance. The chiral carbon on the six‐membered ring of the CTA backbone, as well as the single‐handed helical structure of the backbone, are thought to be responsible for the chiral selectivity of the membrane. This is the first report of using CTA membranes for chiral amino acid separation, providing experimental references and theoretical basis for membrane separation of racemic mixtures. It could facilitate scalable applications of chiral membranes.

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Preparation of cellulose triacetate aerogel via non‐solvent impacted thermally induced phase separation for oil absorption

Cited by 7 publications

References 50 publications

Magnetic chitosan‐based aerogel decorated with polydimethylsiloxane: A high‐performance scavenger for oil in water

Magnetic chitosan‐based aerogel decorated with polydimethylsiloxane: A high‐performance scavenger for oil in water

Recent advances in polymer membranes employing non-toxic solvents and materials

Chiral separation of D,L‐phenylglycine by cellulose triacetate membranes

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