Combining subcritical water extraction and bleaching with hydrogen peroxide to obtain cellulose fibres from rice straw

Freitas, Pedro A.V.; Santana, Laura G.; González-Martínez, Consuelo; Chiralt, Amparo

doi:10.1016/j.carpta.2024.100491

Cited by 5 publications

(2 citation statements)

References 46 publications

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“…The unique values of viscosity, diffusivity, solvent capacity, density, and dielectric constant of water at subcritical conditions allow for increasing its extractive capacity of low or medium polarity compounds, such as active compounds or hemicellulose and lignin (Requena et al 2019). Through the selective extraction of different components, this treatment makes the lignocellulosic substrate more accessible to other puri cation agents, and thus, it can enhance the e cacy of further puri cation treatments (Freitas et al 2023a(Freitas et al , 2024.…”

Section: Introductionmentioning

confidence: 99%

Subcritical water extraction for recovering cellulose fibres from Posidonia oceanica waste

Camarena-Bononad,

Freitas,

Chiralt

et al. 2024

Preprint

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Posidonia oceanica (PO) is an abundant aquatic plant in the Mediterranean Sea that produces a great accumulation of leaves on the coast when detaching off the plant. PO waste collected at landfills could be used as a source of cellulose due to the considerable content of this component (30–40%). In this study, cellulose extraction from PO waste was studied in order to reduce chemicals in the process, in line with the green chemistry principles. Thus, subcritical water extraction (SWE) was applied to promote the separation of non-cellulosic compounds, such as hemicellulose and lignin, followed by bleaching treatments using hydrogen peroxide, alternatively to the usual sodium chlorite. Two SWE temperatures (150 and 170 oC) were tested, while hydrogen peroxide was used at 4 and 8% (v/v) at pH 12 in four one-hour bleaching cycles. This treatment was also carried out with sodium chlorite for comparison purposes. SWE efficiently reduced hemicellulose and lignin content in the solid extraction fraction, mainly at 170 oC, which yielded 63 wt. % of solid fraction, with 51% of cellulose content. This highest temperature also promoted the efficiency of the subsequent bleaching step. Using H2O2 as the bleaching agent, alternatively to chlorine agents, was effective at purifying cellulose but partially altered the cellulose structure through oxidative mechanisms. A combination of SWE at 170 oC and bleaching with H2O2 at 4 or 8% (v/v) yielded 24 wt. % bleached material from PO waste, with a high cellulose richness (near 90%).

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Section: Introductionmentioning

confidence: 99%

Subcritical water extraction for recovering cellulose fibres from Posidonia oceanica waste

Camarena-Bononad,

Freitas,

Chiralt

et al. 2024

Preprint

Self Cite

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“…Previous studies have obtained bioactive extracts from RS by extraction of the phenolic compounds using different green processes oriented to maximise the yield, using water as a solvent, such as the application of ultrasound pre-treatments or extraction with subcritical water at high temperatures and pressures [10][11][12]. The cellulose-rich extraction residue has been used to obtain cellulose fibres with many applications, including as a reinforcing agent in packaging materials, and the production of cellulose aerogels [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Stability and Composting Behaviour of Pla-Starch Laminates Containing Active Extracts and Cellulose Fibres from Rice Straw

Freitas,

González-Martínez,

Chiralt

2024

Preprint

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The stability and composting behaviour of monolayers and laminates of poly(lactic acid) (PLA) and starch with and without active extracts and cellulose fibres from rice straw (RS) were evaluated. The retrogradation of the starch throughout storage (1, 5, and 10 weeks) gave rise to stiffer and less extensible monolayers, with lower water vapour barrier capacity. In contrast, the PLA monolayers, with or without extract, did not show marked changes with storage. However, these changes were more attenuated in the bilayers that gained water vapour and oxygen barrier capacity during storage, maintaining the values of the different properties close to the initial range. The bioactivity of the active films exhibited a slight decrease during the storage, the antioxidant capacity being better preserved in the bilayers. All monolayer and bilayer films were fully composted within 90 days, but with different behaviour. The bilayer assembly enhanced the biodegradation of PLA whose monolayer exhibited a lag period of about 35 days. The active extract reduced biodegradation rate of both mono and bilayers but does not limit the material biodegradation within the time stablished in the Standard. Therefore, PLA-starch laminates, with or without the valorised fractions from RS, can be considered as biodegradable and stable materials for food packaging applications.

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Barley Straw Cellulose Fiber Isolation Using Pressurized Aqueous Ethanol, Ultrasound, and Bleaching Processes

Liu,

Saldaña

2024

Fibers Polym

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Combining subcritical water extraction and bleaching with hydrogen peroxide to obtain cellulose fibres from rice straw

Cited by 5 publications

References 46 publications

Subcritical water extraction for recovering cellulose fibres from Posidonia oceanica waste

Subcritical water extraction for recovering cellulose fibres from Posidonia oceanica waste

Stability and Composting Behaviour of Pla-Starch Laminates Containing Active Extracts and Cellulose Fibres from Rice Straw

Barley Straw Cellulose Fiber Isolation Using Pressurized Aqueous Ethanol, Ultrasound, and Bleaching Processes

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