Development of biomass derived highly porous fast adsorbents for post-combustion CO2 capture

Renewable superhydrophobic materials have attracted great attention due to their extensive applications in the fields such as cost‐effective and biodegradable oil/water separation field. Herein, we reported an eco‐friendly and facile methodology to develop the superhydrophobic cellulosic paper by immersion method using the ethanol solution of stearic acid. Furthermore, the treated cellulosic papers showed super‐hydrophobicity with water contact angle (WCA) above 153°. Interestingly, this method can realize superhydrophobic‐hydrophilic conversion by simply adjusting the temperature and is amenable for different substrates and with the WCA of 114‐162°. More importantly, the utilization of fluorinated reagents has been avoided, thereby minimizing the production cost and improving safety and environmental aspects. Meanwhile, the modified natural cellulosic paper is applied for oil–water separation, and its separation efficiency was as high as 95% after 10 cycles, indicating the good reusability of stearic acid modified filter papers. Consequently, this simple strategy based on the stearic acid immersion method thus provided an easy conversion of superhydrophobic‐hydrophilic interface and provided facile strategies for conversion of commercial quantitative filter paper to functional materials for oil/water separation.

Section: Methodsmentioning

confidence: 99%

“…The temperature was reduced to room temperature under vacuum overnight. At the last, the sample was transferred to the analyzer 52 …”

Section: Methodsmentioning

confidence: 99%

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Fabrication of the superhydrophobic natural cellulosic paper with different wettability and oil/water separation application

Yun

Tong

Wang

et al. 2020

“…The droplets used for measuring were 5 μL [37][38][39] , and the average values of contact angles on five locations of each sample were taken as the experimental data. Surface morphologies and chemical compositions of PEEK samples were investigated by SEM and XPS to characterize the samples [40][41][42] . Surface morphologies of untreated and plasma-treated PEEK samples were observed by an SEM (JSM-6360LV, Japan).…”

Section: Characterizationsmentioning

confidence: 99%

Investigating the effect of water‐mixing nitrogen atmospheric pressure plasma jet on polyether‐ether‐ketone and time stability under different conditions

Liu

Guan

Shen

et al. 2021

Possessing excellent properties including good biocompatibility, high strength, and stiffness, polyether-ether-ketone (PEEK) has significant application values in medical and industrial fields. However, the relatively poor wettability and low adhesion limit its further applications. Atmospheric pressure plasma jet (APPJ) has been utilized for adjusting PEEK properties, but better hydrophilization effect and time stability after treatment are still urgently needed. In this paper, we employ a water-mixing nitrogen (N 2 H 2 O) APPJ to process PEEK, and surface wettability can be effectively improved (contact angle~18 within 2 min, distance between sample and nozzle outlet: 10 mm) without inducing obvious microstructure damages. Additionally, after storing for 40 days, the sample treated by N 2 H 2 O APPJ also possessed better wettability (~54) compared with that treated by N 2 APPJ (~65). On the basis of this lowdamage and high-efficient modification method, we perform aging experiments under different conditions (different temperatures 25, −10 C; and low vacuum condition: 50 kPa) to determine a relatively optimum storing condition for this method. The experiment results indicate that low temperature and vacuum are conducive to retaining the plasma-induced wettability (~34). The treatment method and storing conditions for PEEK presented here may facilitate the application of PEEK in various fields.

“…A broadband was observed from 3600 to 3000 cm −1 corresponding to the stretching vibrations of -OH related to polyglycerol terminal hydroxyl groups. 37 However, as the polymerization degree of polyglycerol increased, more hydroxyl groups in the polyglycerol structure reacted to form ether linkages; which, is seen in the loss of intensity of the OH band. The bimodal asymmetric and symmetric stretching bands (C-H) were observed around 2930 cm −1 and 2877 cm −1 , respectively.…”

Section: Synthesis and Characterization Of Polyglycerols At Differementioning

confidence: 99%

Glycerol polymerization degree effect on the emulsifying properties of polyglycerol esters

Díaz-Lasprilla

Mercado

Ramirez-Caballero

2021

Polymeric emulsifiers based on glycerol and oleic acid were developed and their properties evaluated in palm oil and water solutions. Developed polymeric emulsifiers were polyglycerol-esters. Polymerization degree of polyglycerol-esters at different dosages (from 0.2 to 3% w/v) had a significant effect over emulsion stability, water surface tension, droplet size, and viscosity. Polyglycerol-ester with highest polymerization degree behaved more efficiently as emulsifier. A dosage of 0.5% w/v was required to maintain emulsion stability for a half-life period of 872 min (~14.5 h); which, is 5.6 and 3.6-fold longer stability than with the other two polyglycerol-esters developed. When dosage increased to 3% w/v, the emulsion stability also increased to 3792 min (~2.6 days). Nevertheless, surfactants with lower polymerization degree and molecular weight did not behave the same way. Emulsifier with highest polymerization degree reduced water surface tension by 70% and the mean particle diameter decreased when emulsifier polymerization degree increased. For the viscosity parameter, there were two interesting regions: for shear rates up to 1 s −1 the emulsion behaved as Non-Newtonian fluid type Shear-thinning; while, higher shear rates, the viscosity exhibited a Newtonian profile.