Hydration and Sorption Properties of Raw and Milled Flax Fibers

Karoyo, Abdalla H.; Dehabadi, Leila; Alabi, Wahab O.; Simonson, Carey J.; Wilson, Lee D.

doi:10.1021/acsomega.0c00100

Cited by 15 publications

(9 citation statements)

References 46 publications

(103 reference statements)

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“…Other studies have reported similar findings and conclusions [ 23 , 24 , 33 , 34 ]. Flax has also been proposed for metal removal [ 36 , 37 , 38 , 39 , 40 , 41 ]. For example, Abbar et al [ 36 , 37 ] showed that 1 g of flax was capable of adsorbing 8.4 mg of Zn, 9.9 mg of Cu and 10.7 mg of Pb.…”

Section: Introductionmentioning

confidence: 99%

Biosorbents from Plant Fibers of Hemp and Flax for Metal Removal: Comparison of Their Biosorption Properties

et al. 2021

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Lignocellulosic fibers extracted from plants are considered an interesting raw material for environmentally friendly products with multiple applications. This work investigated the feasibility of using hemp- and flax-based materials in the form of felts as biosorbents for the removal of metals present in aqueous solutions. Biosorption of Al, Cd, Co, Cu, Mn, Ni and Zn from a single solution by the two lignocellulosic-based felts was examined using a batch mode. The parameters studied were initial metal concentration, adsorbent dosage, contact time, and pH. In controlled conditions, the results showed that: (i) the flax-based felt had higher biosorption capacities with respect to the metals studied than the hemp-based felt; (ii) the highest removal efficiency was always obtained for Cu ions, and the following order of Cu > Cd > Zn > Ni > Co > Al > Mn was found for both examined biosorbents; (iii) the process was rapid and 10 min were sufficient to attain the equilibrium; (iv) the efficiency improved with the increase of the adsorbent dosage; and (v) the biosorption capacities were independent of pH between 4 and 6. Based on the obtained results, it can be considered that plant-based felts are new, efficient materials for metal removal.

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Section: Introductionmentioning

confidence: 99%

Biosorbents from Plant Fibers of Hemp and Flax for Metal Removal: Comparison of Their Biosorption Properties

et al. 2021

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“…The cyclic test results for the FF-coated exchanger over the multiple cycles showed that the adsorption–desorption process occurred at equilibrium conditions because latent effectiveness was equal across multiple cycles. Based on the results reported herein, FFs represent a promising and sustainable alternative biodesiccant coating for air-to-air heat exchangers in energy wheel applications, where the latent effectiveness rivals the properties of SPs biomass and other conventional solid desiccant systems (e.g., SGs). − From a techno-economic perspective, the relative biodesiccant performance of FFs and SPs reveal that FFs are a promising alternative material in view of their abundant and sustainable supply from waste agricultural biomass. , …”

Section: Discussionmentioning

confidence: 99%

“…Figure 1a), as compared with other hydrophilic biopolymers, such as (hemi)cellulose and pectins. Finally, the difference in the particle size (Figure 1b) and morphology of FFs and SPs (fibrils vs spheroids) is inferred to contribute to water uptake results because the reduced packing efficiency of FFs over SPs contributes to greater adsorption of N 2 at the particle grain interface, 70 as observed herein (cf. Figure 1c,d).…”

Section: Latent Effectiveness Of the Exchanger For The Singlementioning

confidence: 99%

Comparison of the Moisture Adsorption Properties of Starch Particles and Flax Fiber Coatings for Energy Wheel Applications

et al. 2020

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The adsorption–desorption behavior of flax fibers (FFs) is reported in this paper. FFs are a potential desiccant material for air-to-air energy wheels, which transfer heat and moisture in building heating, ventilation, and air conditioning (HVAC) systems. The raw FFs sample was subjected to physical modification, followed by complementary material characterization to understand the relationship between its structure and its moisture uptake performance. The surface and textural properties of the modified FFs were determined by gas adsorption (N2, H2O) and gravimetric liquid water swelling studies and further supported by spectroscopic (infrared and scanning electron microscopy) results. A FF-coated small-scale energy exchanger was used to determine the moisture transfer (or latent effectiveness; εl) using single-step and cyclic testing. The FF-coated exchanger had εl values of ∼10 and 40% greater compared to similar exchangers coated with starch particles (SPs) and silica gel (SG) reported in a previous study. The enhanced surface and textural properties, along with the complex compositional structure of FFs and its greater propensity to swell in water, account for the improved performance over SPs. Thus, FFs offer an alternative low-cost, environment-friendly, and sustainable biodesiccant for air-to-air energy wheel applications in buildings. The current study contributes to an improved understanding of the structure–function relationship of biodesiccants for such energy wheel applications.

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“…Biomass valorization through physical and/or chemical modification yields materials with tunable textural and/or surface properties for tailored applications. The chemical composition, surface chemistry and the mechanical strength of biomass materials have been modified by facile physical methods such as grinding/ball milling and sieving [13]. By contrast, benzoylation, acetylation, silane and peroxide treatment are some methods used to alter the physicochemical properties of bio-fibers [12,14,15].…”

Section: Introductionmentioning

confidence: 99%

“…The chemical composition, surface chemistry and the mechanical strength of biomass materials have been modified by facile physical methods such as grinding/ball milling and sieving [ 13 ]. By contrast, benzoylation, acetylation, silane and peroxide treatment are some methods used to alter the physicochemical properties of bio-fibers [ 12 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Flax Biomass Conversion via Controlled Oxidation: Facile Tuning of Physicochemical Properties

et al. 2020

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The role of chemical modification of pristine linen fiber (LF) on its physicochemical and adsorption properties is reported in this contribution. The surface and textural properties of the pristine LF and its peroxyacetic acid- (PAF) and chlorite-treated (CF) fiber forms were characterized by several complementary methods: spectroscopy (SEM, TEM, FT-IR, and XPS), thermal analysis (DSC and TGA), gas/water adsorption isotherms, and zeta potential (ξ). The results obtained reveal that the surface charge and textural properties (surface area and pore structure) of the LF material was modified upon chemical treatment, as indicated by changes in the biomass composition, morphology, ξ-values, and water/dye uptake properties of the fiber samples. Particularly, the pristine LF sample displays preferential removal efficiency (ER) of methylene blue (MB) dye with ER ~3-fold greater (ER~62%) as compared to the modified materials (CF or PAF; ER~21%), due to the role of surface charge of pectins and lignins present in pristine LF. At higher MB concentration, the relative ER values for LF (~19%) relative to CF or PAF (~16%) reveal the greater role of micropore adsorption sites due to the contributing effect of the textural porosity observed for the modified flax biomass at these conditions. Similar trends occur for the adsorption of water in the liquid vs. vapour phases. The chemical treatment of LF alters the polarity/charge of the surface functional groups, and pore structure properties of the chemically treated fibers, according to the variable hydration properties. The surface and textural properties of LF are altered upon chemical modification, according to the variable adsorption properties with liquid water (l) vs. water vapor (g) due to the role of surface- vs. pore-sites. This study contributes to an understanding of the structure-adsorption properties for pristine and oxidized flax fiber biomass. The chemical conversion of such biomass yields biomaterials with tunable surface and textural properties, as evidenced by the unique adsorption properties observed for pristine LF and its modified forms (CF and PAF). This study addresses knowledge gaps in the field by contributing insight on the relationship between structure and adsorption properties of such LF biomass in its pristine and chemically modified forms.

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Hydration and Sorption Properties of Raw and Milled Flax Fibers

Cited by 15 publications

References 46 publications

Biosorbents from Plant Fibers of Hemp and Flax for Metal Removal: Comparison of Their Biosorption Properties

Biosorbents from Plant Fibers of Hemp and Flax for Metal Removal: Comparison of Their Biosorption Properties

Comparison of the Moisture Adsorption Properties of Starch Particles and Flax Fiber Coatings for Energy Wheel Applications

Flax Biomass Conversion via Controlled Oxidation: Facile Tuning of Physicochemical Properties

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