Nano fibrillated cellulose‐based foam by Pickering emulsion: Preparation, characterizations, and application as dye adsorbent

An ecofriendly and biodegradable porous structure was prepared from drying aqueous foams based on nano fibrillated cellulose (NFC), extracted from softwood pulp by subcritical water/CO2 treatment (SC‐NFC). The primary aim of this work was to use the modified SC‐NFC as stabilizer for a water‐based Pi...

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Bibliographic Details
Published in:Polymer engineering and science 2021-11, Vol.61 (11), p.2831-2842
Main Authors: Purkayastha, Srijita, Ghosh, Anup K., Saha, Sampa
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Analysis
Biodegradability
Cellulose
Charge density
Composition
Compressive strength
Drying
dye adsorption
Dyes
Emulsions
Foam
Foams
Identification and classification
Industrial effluents
Isotherms
Kinetics
Methylene blue
nano fibrillated cellulose
Pickering emulsion
Porous materials
Properties
subcritical water
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Summary:An ecofriendly and biodegradable porous structure was prepared from drying aqueous foams based on nano fibrillated cellulose (NFC), extracted from softwood pulp by subcritical water/CO2 treatment (SC‐NFC). The primary aim of this work was to use the modified SC‐NFC as stabilizer for a water‐based Pickering emulsion which upon drying, yielded porous cellulosic materials, a good dye adsorbent. In order to exploit the carboxymethylated SC‐NFC (CMSC‐NFC, with a degree of substitution of 0.35 and a charge density of 649 μeqv/g) as a stabilizer for water‐based Pickering emulsion in subsequent step, an optimized quantity of octyl amine (30 mg/g of SC‐NFC) was added to make them partially hydrophobic. A series of dry foam structures were prepared by varying the concentrations of treated CMSC‐NFCs and 4 wt% was found to be the optimum concentration to yield foam with high porosity (99%) and low density (0.038 g/cc) along with high compression strength (0.24 MPa), superior to the conventionally extracted NFC. The foams were applied to capture as high as 98% of methylene blue dyes, making them a potential green candidate for treating industrial effluent. In addition, the dye adsorption kinetics and isotherms were found to be well suited with second order kinetics and Langmuir isotherm models.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.25803