Green acid-free one-step hydrothermal ammonium persulfate oxidation of viscose fiber wastes to obtain carboxylated spherical cellulose nanocrystals for oil/water Pickering emulsion

Ye, Shounuan; Yu, Haiyue; Wang, Duan-Chao; Zhu, Jiaying; Gu, Jiping

doi:10.1007/s10570-018-1917-x

Cited by 55 publications

(36 citation statements)

References 53 publications

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“…Comparatively, the yield of conventional heating (C 1 ) was very close to the highest for the microwave mode of heating (M 3 ). Note that, in other previous works, APS treatment applied to the cotton raw material has led to CNCs with average yields that were comparable or even lower than that achieved using M 3 method [40][41][42]. Additionally, the results were, in all MW heating programs, more repeatable, with standard deviations significantly lower than the conventional CNCs preparation procedure, thanks to the rigid control of the reaction conditions allowed by the microwave reactor.…”

Section: Evaluation Of the Yield Of Cellulose Nanocrystalsmentioning

confidence: 61%

Fast Production of Cellulose Nanocrystals by Hydrolytic-Oxidative Microwave-Assisted Treatment

et al. 2020

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In contrast to conventional approaches, which are considered to be energy- and time-intensive, expensive, and not green, herein, we report an alternative microwave-assisted ammonium persulfate (APS) method for cellulose nanocrystals (CNCs) production, under pressurized conditions in a closed reaction system. The aim was to optimize the hydrolytic-oxidative patented procedure (US 8,900,706), replacing the conventional heating with a faster process that would allow the industrial scale production of the nanomaterial and make it more appealing to a green economy. A microwave-assisted process was performed according to different time–temperature programs, varying the ramp (from 5 to 40 min) and the hold heating time (from 60 to 90 min), at a fixed reagent concentration and weight ratio of the raw material/APS solution. Differences in composition, structure, and morphology of the nanocrystals, arising from traditional and microwave methods, were studied by several techniques (TEM, Fourier transform infrared spectroscopy (FTIR)-attenuated total reflectance (ATR), dynamic light scattering (DLS), electrophoretic light scattering (ELS), thermogravimetric analysis (TGA), X-ray diffraction (XRD)), and the extraction yields were calculated. Fine tuning the microwave treatment variables, it was possible to realize a simple, cost-effective way for faster materials’ preparation, which allowed achieving high-quality CNCs, with a defined hydrodynamic diameter (150 nm) and zeta potential (−0.040 V), comparable to those obtained using conventional heating, in only 90 min instead of 16 h.

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Section: Evaluation Of the Yield Of Cellulose Nanocrystalsmentioning

confidence: 61%

Fast Production of Cellulose Nanocrystals by Hydrolytic-Oxidative Microwave-Assisted Treatment

et al. 2020

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“…In the case of 3% MMT, T-20 may play a dominant role for stabilizing the emulsion. When the content of MMT increased to 5%, most of the MMT may be coated with T-20 and then fixed at the O/W interface (Ye et al, 2018). The large size of the coated MMT can only stabilize the droplet larger than T-20; thus, the pore size of macroporous monoliths increased obviously.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Carboxymethyl Cellulose-Based Macroporous Adsorbent by Eco-Friendly Pickering-MIPEs Template for Fast Removal of Pb2+ and Cd2+

Wang

Zhu

et al. 2019

Front. Chem.

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Recently, Pickering high internal phase emulsions (Pickering HIPEs) have been widely used to fabricate macroporous materials. However, the high usage of poisonous organic solvent in HIPEs not only greatly increases the cost but also is harmful to human health and environment, which leads to limited large-scale applications. In this study, we prepared a novel monolithic macroporous material of carboxymethyl cellulose-g-poly(acrylamide)/montmorillonite (CMC-g-PAM/MMT) by the free radical polymerization via oil-in-water Pickering medium internal phase emulsions (Pickering MIPEs), which used the non-toxic and eco-friendly flaxseed oil as continuous phase, MMT, and Tween-20 (T-20) as stabilizer. The pore structure of the resulting macroporous materials could be tuned easily by adjusting the content of MMT, co-surfactant T-20, and the oil phase volume fraction. The maximal adsorption capacities of the prepared macroporous material for Pb2+ and Cd2+ were 456.05 and 278.11 mg/g, respectively, and the adsorption equilibrium can be reached within 30 min. Otherwise, the macroporous monolith exhibited excellent reusability through five adsorption–desorption cycles. Thus, the eco-friendly Pickering-MIPEs is a potential alternative method to be used to fabricate multi-porous adsorption materials for environmental applications.

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“…5b, the carbonyl peak at 1731 cm -1 in the recycled MDF fibers attributed to the C=O stretching of the acetyl ester and uronic groups of hemicellulose and the ester linkage of the carboxylic groups of the ferulic and p-coumaric groups in lignin (Fortunati et al, 2016;Goh et al, 2016;Hafemann et al, 2019;Ng et al, 2015). On the other hand, in spectrum of the carboxylated CNCs at pH 4, a new carbonyl peak was observed at ∼1728 cm -1 , which was attributed to the C=O stretching peak of the carboxyl groups (-COOH), indicating that the functional groups were successfully introduced onto the surface of the prepared CNCs (Cheng et al, 2014;Goh et al, 2016;Liu et al, 2019;Mascheroni et al, 2016;Nascimento et al, 2016;Oun and Rhim, 2017;Ye et al, 2018;Zhang et al, 2016). In the case of the carboxylated CNCs at pH 7, the band shifted to 1608 cm -1 , which is responsible for sodium carboxylates (COO -Na + ) (Oun and Rhim, 2017).…”

Section: Atr-ftir Analysis Of Recycled Mdf Fibers and Carboxylated-cncsmentioning

confidence: 99%

“…The DO stands for a ratio of the amount of oxidized -OH groups to that of the un-oxidized groups on the anhydroglucose unit (Ye et al, 2018). The DO of CNCs depends not only on the source of cellulose but also on the reaction conditions (temperature, time and concentration of oxidizing agent) (Cheng et al, 2014;Leung et al, 2011).…”

Section: Morphology Of Carboxylated Cncsmentioning

confidence: 99%

Characterization of Carboxylated Cellulose Nanocrystals from Recycled Fiberboard Fibers Using Ammonium Persulfate Oxidation

Khanjanzadeh¹,

Park²

2020

Journal of the Korean Wood Science and Technology

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As a way of finding value-added materials from waste medium density fiberboard (MDF), this study characterized cellulose nanocrystals (CNCs) isolated by ammonium persulfate (APS) oxidation using recycled MDF fibers. Chemical composition of the recycled MDF fibers was done to quantify α-cellulose, hemicellulose, lignin, nitrogen, ash and extractives. The APS oxidation was performed at 60 °C for 16 h, followed by ultrasonication, which resulted in a CNC yield of 11%. Transmission electron microscope images showed that rod-like CNCs had an average length and diameter of 167±47 nm and 8.24±2.28 nm, respectively, which gave an aspect ratio of about 20. The conductometric titration of aqueous CNCs suspension resulted in a carboxyl content of 0.24 mmol/g and the degree of oxidation was 0.04. Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy clearly showed the presence of carboxyl group on the CNCs prepared by the APS oxidation. The change of pH of the aqueous CNC suspension from 4 to 7 converted the carboxyl group to sodium carboxylate group. These results showed that the APS oxidation was facile and CNCs had a one-step preparation method, and thus suggested an optimization of the oxidation condition in future.

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Green acid-free one-step hydrothermal ammonium persulfate oxidation of viscose fiber wastes to obtain carboxylated spherical cellulose nanocrystals for oil/water Pickering emulsion

Cited by 55 publications

References 53 publications

Fast Production of Cellulose Nanocrystals by Hydrolytic-Oxidative Microwave-Assisted Treatment

Fast Production of Cellulose Nanocrystals by Hydrolytic-Oxidative Microwave-Assisted Treatment

Preparation of Carboxymethyl Cellulose-Based Macroporous Adsorbent by Eco-Friendly Pickering-MIPEs Template for Fast Removal of Pb2+ and Cd2+

Characterization of Carboxylated Cellulose Nanocrystals from Recycled Fiberboard Fibers Using Ammonium Persulfate Oxidation

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