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Nanocellulose solution based on iron(iii) sodium tartrate complexes

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Published/Copyright: November 5, 2025
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Abstract

This research aims to efficiently convert biomass residues like wheat and rapeseed straw into potential cellulose-based nanomaterials using the iron(iii) sodium tartrate solvent and assess their suitability for nanocellulose solutions based on the selected mechanical, physical, and optical properties of the paper. The nanocellulose solution from wheat straw achieved better general solvent properties. The burst index for kraft pulp was significantly increased from an initial 37.63 to 124.27 kPa after applying wheat nanocellulose solution, and to 121.03 kPa for rapeseed straw solution. Furthermore, the tensile index of the kraft pulp increases from 12.00 to 17.04 N m g−1 for the wheat solution and 14.39 N m g−1 for the rapeseed straw solution, which is comparable to industrial nanofibrils (14.04 N m g−1) and nanocrystals (15.88 N m g−1). This research confirms the potential of biomass residues as a valuable alternative raw material for producing a nanocellulose solution.

Graphical abstract

1 Introduction

Lignocellulosic materials are natural biocomposite polymers composed of cellulose, hemicellulose, and lignin, with proportions depending on the plant type, location, and soil conditions. The cellulose content varies widely: seeds 2–12%, biomass residues 31–59%, wood 41–53%, flax and hemp around 70%, and cotton up to 95% [1].

This study focuses on cellulose utilization from crop biomass residues, specifically wheat and rapeseed. Large amounts of residues are generated during harvest, often insufficiently used or burned, causing environmental issues such as dioxin emissions and soil damage [2]. Proper utilization can include energy recovery (biogas, bioethanol, biodiesel) or higher-value applications, such as paper production or isolation of cellulose, hemicellulose, and lignin for further use.

Nanocellulose production involves deconstructing cellulose into nanoscale fibrils or crystals. Its application spans papermaking, packaging films, biomedical materials, coatings, adhesives, and nanocomposites [3,4,5,6,7,8,9,10,11,12]. Nanocellulose exhibits exceptional mechanical properties (Young’s modulus up to 70 GPa; specific modulus 65–85 J g−1) and high aspect ratios, surface area, and hydrogen-bonding potential, enabling diverse functionalization and performance enhancements [13,14,15,16,17].

Iron(iii) sodium tartrate (FeTNa) complexes have been employed to modify cellulose properties, influencing swelling or dissolution depending on the composition, and are used for viscometric evaluation of cellulose polymerization [18,19]. Metal–complex solvents, including imidazolium-based ionic liquids, provide environmentally friendly alternatives for nanocellulose extraction from various feedstocks [15,20,21,22,23,24,25,26,27,28,29,30].

This work presents an innovative approach for producing FeTNa-derived nanocellulose solutions from wheat and rapeseed residues. By valorizing underutilized biomass, this study aims to generate high-value nanocellulose materials with potential applications in papermaking, packaging, and other industrial sectors, supporting sustainable agricultural practices.

2 Materials and methods

2.1 Materials

The two main crops used for nanocellulose production were wheat straw (Triticum aestivum) and rapeseed straw (Brassica napus L.).

For the production of the laboratory sheets, industrial pulp made from a mixture of pine and spruce supplied by Mondi Štětí, cooked using kraft technology with Kappa number 24.9, and flax pulp produced using the soda process by the Delfort Group with Kappa number 19.9 was used.

Comparative nanocellulose solutions included CNF nanofibrils (diameter 20–60 nm, length several micrometers) and CNC nanocrystals (width 10–20 nm, 50–400 nm length) obtained from CelluloseLab (Fredericton, NB, Canada).

2.2 Chemical analysis

The biomass residues from wheat and rapeseed were ground using an MF 10 BASIC knife mill IKA (Staufen, Germany).

Before chemical analysis, extractives were removed using an ethanol–toluene mixture following Tappi T5 wd-73 standard [31]. Cellulose content was determined by Seifert’s method [32], holocellulose according to Wise et al. [33], and Klason lignin following Tappi T222 om-11 [31]. Inorganic content, ash, was measured according to Tappi T211 om-02 [31].

2.3 FeTNa preparation

The FeTNa cellulose solvent FeTNa was prepared from disodium tartrate, ferric nonahydrate, and sodium hydroxide solutions. Before use, the solution was filtered using an S2 frit [34].

2.3.1 Production of nanocellulose solution

Seifert cellulose of wheat and rapeseed straw was added to 30 mL of FeTNa solvent at concentrations of 0.01, 0.02, 0.025, 0.04, and 0.05 g L−1. Grinding beads were added to achieve a 26% filling of the grinding space. Samples were shaken at 1,050 rpm for 120 h, yielding a colloidal dispersion of nanocellulose solution.

2.3.2 Testing the nanocellulose solution

Basic liquid parameters: dynamic viscosity, density, and interfacial tension were measured using a Ubbelhode viscometer, pycnometer, and stalagmometer, respectively.

The degree of polymerization (DP) was calculated according to SCAN CM 15:88 [35] and ISO 5351 [36] standards, with viscosity ratio (equation (1)), specific viscosity (equation (2)), reduced viscosity (equation (3)), and limiting viscosity number (equation (4)) determined as follows:

(1) η rel = τ 1 / τ 2 ,

(2) η sp = η rel 1 ,

(3) η red = η sp / ρ ,

(4) LVN = lim ( η sp / ρ ) ,

(5) DP = 193.5 LVN ( 1.064 ) .

2.4 Production of laboratory sheets

Laboratory handsheets were prepared from soda flax and kraft conifer pulp at 70 g m−2 using a RAPID KÖTHEN RK-2A laboratory sheet former (Birkenau, Germany).

2.5 Application of nanocellulose solution

The nanocellulose solutions were applied by spraying, increasing the basis weight by 90 g m−2, resulting in the nanolayer deposition of 20 g m−2.

2.6 Artificial aging

The samples were subjected to UV irradiation based on ISO 16053-2 [37] in a Q-Lab (Cleveland, USA) for 47 h, simulating 24,000 h of natural UV radiation.

2.7 Properties of paper treated with a layer of nanocellulose solution

2.7.1 Scanning electron microscopy (SEM)

Samples were mounted on stubs, coated with gold in a JFC-1300 sputter coater (JEOL, Tokyo, Japan) under argon, and examined with a JEOL JSM-IT500HR microscope at 12 kV.

2.7.2 Optical properties

Color was measured using a Konica Minolta CM-700D spectrophotometer (Osaka, Japan) under D65 illumination at a standard viewing angle of 10° according to ISO/CIE 11664-4 [38]. Color deviation (ΔE) followed ISO 11664-6 [39], and chroma C was calculated as follows [40]:

(6) C = ( a 2 + b 2 ) ( 1 / 2 ) .

The color change ∆E was assessed according to Zmeškal et al. [41], and the values are listed in Table 1.

Table 1

E color differences [41]

E* Difference E* Difference
0.0–0.2 Imperceptible
0.2–0.5 Very faint 0.2–1.0 Perceptible
0.5–1.5 Faint 1.0–2.0 Discernible
1.5–3.0 Clearly perceptible 2.0–4.0 Not yet disturbing
3.0–6.0 Moderate 4.0–8.0 Slightly disturbing
6.0–12.0 Severe
12.0–16.0 Very severe
>16.0 Disturbing

2.7.3 Physical properties

Smoothness by Bekk and roughness by Parker were measured according to ISO/DIN 5627 [42] and ISO 8791-4 [43], respectively.

2.7.4 Statistical evaluation

Wilks’ multivariate test of significance and Tukey HSD test were used for statistical analysis, performed in software Statistica 14.1 (TIBCO Software Inc.).

2.7.5 Mechanical properties

The tensile strength was measured according to ISO 1924-2 [44] and burst strength according to ISO 2758 [45] using FRANK PTI equipment (Birkenau, Germany).

3 Results

3.1 Chemical analysis

The chemical composition of wheat and rapeseed straw is summarized in Table 2. The ash, extractives, cellulose, hemicelluloses, and lignin contents were determined, providing a basis for evaluating the potential for nanocellulose production.

Table 2

Chemical composition (in mass % of oven-dried samples)

Raw Ash Extractives Cellulose Lignin Holocellulose
Wheat straw 4.33 ± 0.12 3.54 ± 0.01 42.64 ± 0.06 28.49 ± 0.04 75.55 ± 0.10
Rapeseed straw 8.70 ± 0.13 6.83 ± 0.00 39.09 ± 0.01 27.72 ± 0.03 74.66 ± 0.01

3.2 Properties of nanocellulose solution

The general properties of the FeTNa nanocellulose solutions, including viscosity, density, interfacial tension, and DP, are listed in Table 3. Higher nanocellulose concentrations increased the polymerization and viscosity, while density showed no clear trend at the concentrations tested.

Table 3

Properties of the nanocellulose solution

Nanocellulose solution Concentration (g L−1) Density (kg m−3) Dynamic viscosity (Pa s) Interfacial tension (mN m−1) DP
Wheat straw 0.01 1237.84 3.37 72.39 355
0.02 1233.70 3.53 71.57 290
0.025 1238.82 4.70 64.80 327
0.04 1235.30 5.54 52.41 266
0.05 1239.07 6.37 56.37 252
Rapeseed straw 0.01 1235.88 3.17 66.06 263
0.02 1233.20 3.30 63.88 165
0.025 1237.18 3.52 58.98 165
0.04 1234.61 4.10 61.63 156
0.05 1238.02 4.59 153

3.3 Properties of handsheet treated with a layer of nanocellulose solution

3.3.1 SEM

The SEM images (Figure 1) confirmed the formation of a continuous nanocellulose film on the pulp fibers, indicating effective deposition from the FeTNa solution.

Figure 1 
                     SEM images: (a) soda pulp, (b) soda pulp with rapeseed FeTNa solution, and (c) soda pulp with the wheat FeTNa solution.
Figure 1

SEM images: (a) soda pulp, (b) soda pulp with rapeseed FeTNa solution, and (c) soda pulp with the wheat FeTNa solution.

3.3.2 Optical properties

The color deviation (ΔE) was measured relative to untreated reference samples and after artificial UV aging. Table 4 presents the ΔE values, alongside industrial CNF nanofibrils and CNC nanocrystals for comparison.

Table 4

Optical properties

Pulp Type of nanomaterial Concentration (g L−1) ΔE – after application of the nanocellulose solution ΔE – after UV aging Chrome after UV aging
Soda flax pulp Nanocellulose wheat solution 0.01 19.18 ± 6.21 37.88 ± 5.63 20.97 ± 5.91
0.02 18.52 ± 2.73 41.96 ± 4.96 20.22 ± 5.66
0.025 20.28 ± 7.34 41.42 ± 4.24 20.56 ± 5.69
0.04 18.15 ± 6.18 30.44 ± 5.46 20.02 ± 5.39
0.05 15.93 ± 13.24 16.27 ± 3.75 17.71 ± 5.97
Nanocellulose rapeseed solution 0.01 9.65 ± 2.03 27.40 ± 7.75 19.41 ± 5.69
0.02 9.38 ± 3.33 27.52 ± 7.50 18.70 ± 5.17
0.025 8.93 ± 4.04 12.09 ± 3.19 19.76 ± 3.18
0.04 9.19 ± 0.68 27.46 ± 7.60 19.34 ± 5.55
0.05 10.22 ± 1.04 25.48 ± 4.06 19.66 ± 5.53
Nanofibrils 0.70 ± 0.50 1.27 ± 0.85 2.34 ± 0.42
Nanocrystals 2.14 ± 0.44 2.87 ± 0.53 6.46 ± 0.40
Kraft pulp from conifers Nanocellulose wheat solution 0.01 5.94 ± 1.00 17.60 ± 9.30 27.92 ± 5.98
0.02 6.06 ± 1.34 20.40 ± 7.56 27.78 ± 5.95
0.025 5.59 ± 1.44 17.84 ± 6.78 28.35 ± 5.19
0.04 4.94 ± 0.74 13.21 ± 6.53 29.27 ± 4.33
0.05 6.58 ± 1.77 17.99 ± 9.34 28.36 ± 5.48
Nanocellulose rapeseed solution 0.01 5.38 ± 2.35 6.53 ± 1.58 29.60 ± 1.33
0.02 6.31 ± 1.24 18.38 ± 7.46 28.61 ± 5.50
0.025 5.30 ± 1.23 21.29 ± 7.66 27.85 ± 5.90
0.04 3.99 ± 0.74 14.69 ± 5.73 29.60 ± 4.56
0.05 5.09 ± 0.41 17.95 ± 6.51 28.30 ± 5.79
Nanofibrils 1.81 ± 0.52 4.39 ± 0.97 22.95 ± 0.44
Nanocrystals 1.42 ± 0.35 2.21 ± 0.46 24.70 ± 0.66

The chroma values (C) were calculated as differences in color saturation after UV aging relative to the nitrocellulose-modified sample.

3.3.3 Statistical evaluation

The statistical evaluation of the color change is shown in Figures 2 and 3. Tables 5 and 6 present statistical analyses of color change using Wilks’ test and Tukey’s post-hoc analysis. Pulp type and nanocellulose material significantly affected the outcomes (p < 0.01), while concentration had a smaller but still notable influence (p = 0.02). Kraft pulp samples were generally more color-stable than soda pulp samples, and nanocellulose from rapeseed exhibited higher stability than wheat-derived nanoparticles.

Figure 2 
                     Color change parameter dE after modification.
Figure 2

Color change parameter dE after modification.

Figure 3 
                     Color change parameter dE after UV aging.
Figure 3

Color change parameter dE after UV aging.

Table 5

Wilks’ multivariate test of significance for color parameters

Effect Value F Effect df Error df p Partial eta-squared Non-centrality Observed power (alpha = 0.05)
Intercept 0.04631 607.578 2 59 0.00000 0.95369 1215.16 1.00000
Pulp type 0.31699 63.563 2 59 0.00000 0.68301 127.13 1.00000
Dissolved material 0.63192 17.183 2 59 0.00001 0.36808 34.37 0.99966
Concentration 0.82491 1.490 8 118 0.16798 0.09175 11.92 0.64668
Pulp type* dissolved material 0.71867 11.548 2 59 0.00006 0.28133 23.10 0.99141
Pulp type* concentration 0.74911 2.292 8 118 0.02559 0.13449 18.34 0.86026
Dissolved material* concentration 0.74085 2.387 8 118 0.02021 0.13928 19.10 0.87646
Pulp type* dissolved material* concentration 0.70497 2.817 8 118 0.00679 0.16038 22.54 0.93154
Table 6

Tukey HSD test, homogenous group, alpha = 0.05000 (non-exhaustive search) for color parameters

Pulp type Dissolved material Concen-tration dE mod mean 1 2 3 4
Kraft Rapeseed 0.04 3.98654 ****
Kraft Wheat 0.04 4.93703 **** ****
Kraft Rapeseed 0.05 5.08938 **** ****
Kraft Rapeseed 0.025 5.30209 **** ****
Kraft Rapeseed 0.01 5.37861 **** ****
Kraft Wheat 0.025 5.58884 **** ****
Kraft Wheat 0.01 5.93867 **** ****
Kraft Wheat 0.02 6.05503 **** ****
Kraft Rapeseed 0.02 6.31403 **** ****
Kraft Wheat 0.05 6.58132 **** ****
Soda Rapeseed 0.025 8.93195 **** **** ****
Soda Rapeseed 0.04 9.18659 **** **** **** ****
Soda Rapeseed 0.02 9.37504 **** **** **** ****
Soda Rapeseed 0.01 9.64797 **** **** **** ****
Soda Rapeseed 0.05 10.21742 **** **** **** ****
Soda Wheat 0.05 15.92903 **** **** ****
Soda Wheat 0.04 18.14870 **** ****
Soda Wheat 0.02 18.52248 **** ****
Soda Wheat 0.01 19.18459 **** ****
Soda Wheat 0.025 20.27769 ****

3.3.4 Physical properties

Bekk smoothness and Parker roughness of the treated handsheets are reported in Table 7. The application of FeTNa nanocellulose solutions slightly altered the surface properties, with variations depending on the pulp type and the nanocellulose raw.

Table 7

Physical properties

Pulp Type of nanomaterial Concentration (g L−1) Bekk smoothness [s] Parker roughness [kPa]
Soda flax pulp Nanocellulose wheat solution 0.01 0.90 ± 0.17 7.79 ± 0.18
0.02 0.87 ± 0.12 7.89 ± 0.00
0.025 1.10 ± 0.00 7.74 ± 0.15
0.04 1.30 ± 0.17 7.81 ± 0.10
0.05 1.10 ± 0.10 7.60 ± 0.18
Nanocellulose rapeseed solution 0.01 1.23 ± 0.12 7.62 ± 0.04
0.02 1.10 ± 0.26 7.77 ± 0.15
0.025 0.93 ± 0.12 7.89 ± 0.00
0.04 0.63 ± 0.06 7.88 ± 0.02
0.05 1.17 ± 0.06 7.44 ± 0.06
Nanofibrils 1.90 ± 0.10 7.25 ± 0.09
Nanocrystals 0.80 ± 0.17 7.82 ± 0.08
Reference 2.97 ± 0.23 7.11 ± 0.02
Kraft pulp from conifers Nanocellulose wheat solution 0.01 0.80 ± 0.00 7.89 ± 0.00
0.02 1.00 ± 0.00 7.85 ± 0.08
0.025 0.80 ± 0.00 7.89 ± 0.00
0.04 1.10 ± 0.20 7.60 ± 0.10
0.05 1.10 ± 0.26 7.54 ± 0.26
Nanocellulose rapeseed solution 0.01 1.87 ± 0.31 7.47 ± 0.12
0.02 1.40 ± 0.10 7.89 ± 0.00
0.025 1.50 ± 0.10 7.33 ± 0.27
0.04 1.93 ± 0.21 7.03 ± 0.13
0.05 2.07 ± 0.12 7.16 ± 0.07
Nanofibrils 3.43 ± 0.40 7.07 ± 0.06
Nanocrystals 1.57 ± 0.25 7.32 ± 0.16
Reference 2.93 ± 0.15 5.30 ± 1.76

3.3.5 Mechanical properties

Tensile strength (breaking length, relative elongation, tensile index) and burst index of the treated handsheets are shown in Table 8. FeTNa-derived nanocellulose moderately improved the mechanical performance, particularly for kraft pulp.

Table 8

Mechanical properties

Pulp Type of nanomaterials c (g L−1) BL (km) ε (%) TI (N m g−1) BI (kPa)
Soda flax pulp Nanocellulose wheat solution 0.01 0.76 ± 0.03 2.27 ± 0.27 7.46 ± 0.33 68.50 ± 2.42
0.02 0.72 ± 0.00 2.11 ± 0.32 7.04 ± 0.01 73.63 ± 9.18
0.025 0.88 ± 0.18 1.76 ± 0.06 8.65 ± 1.80 64.83 ± 7.96
0.04 0.92 ± 0.22 1.99 ± 0.06 8.95 ± 2.14 91.60 ± 8.26
0.05 1.02 ± 0.09 1.85 ± 0.07 9.95 ± 0.85 65.83 ± 12.00
Nanocellulose rapeseed solution 0.01 1.11 ± 0.04 2.09 ± 0.51 10.87 ± 0.38 68.17 ± 8.27
0.02 0.91 ± 0.09 2.04 ± 0.31 8.90 ± 0.89 73.70 ± 3.06
0.025 0.86 ± 0.03 2.12 ± 0.24 8.45 ± 0.32 65.27 ± 8.24
0.04 0.63 ± 0.02 2.93 ± 0.06 6.13 ± 0.21 51.60 ± 5.35
0.05 0.68 ± 0.04 1.63 ± 0.04 6.66 ± 0.45 66.57 ± 3.54
Nanofibrils 0.98 ± 0.06 0.83 ± 0.18 9.55 ± 0.62 50.53 ± 4.07
Nanocrystals 2.72 ± 0.05 2.24 ± 0.06 26.63 ± 0.48 135.93 ± 26.19
Reference 1.48 ± 0.19 2.08 ± 0.35 14.46 ± 1.82 73.97 ± 10.01
Kraft pulp from conifers Nanocellulose wheat solution 0.01 1.23 ± 0.13 3.20 ± 0.91 12.04 ± 1.27 113.63 ± 27.95
0.02 1.42 ± 0.15 3.30 ± 0.09 13.91 ± 1.44 101.06 ± 18.32
0.025 1.74 ± 0.08 3.50 ± 0.02 17.04 ± 0.76 124.27 ± 13.47
0.04 1.37 ± 0.21 3.11 ± 0.49 13.43 ± 2.09 99.30 ± 6.24
0.05 1.24 ± 0.08 3.67 ± 0.29 12.18 ± 0.79 88.33 ± 9.30
Nanocellulose rapeseed solution 0.01 1.47 ± 0.04 3.51 ± 0.50 14.39 ± 0.44 111.40 ± 15.88
0.02 1.25 ± 0.09 3.73 ± 0.78 12.24 ± 0.93 121.03 ± 19.21
0.025 1.27 ± 0.07 2.74 ± 0.62 12.45 ± 0.69 103.63 ± 26.93
0.04 1.03 ± 0.23 2.81 ± 0.12 10.11 ± 2.19 71.77 ± 2.84
0.05 1.42 ± 0.09 3.59 ± 0.33 13.85 ± 0.92 103.00 ± 4.33
Nanofibrils 1.43 ± 0.08 2.11 ± 0.01 14.04 ± 0.85 74.93 ± 3.41
Nanocrystals 1.62 ± 0.04 1.32 ± 0.29 15.88 ± 0.45 130.10 ± 26.15
Reference 1.23 ± 0.01 0.81 ± 0.04 12.00 ± 0.08 37.63 ± 3.04

4 Discussion

4.1 Mechanical performance

The nanocellulose coating did not affect the tensile index of the soda flax pulp, but only for the nanocrystal application, similar to the burst index. For the kraft pulp, both tensile and burst indexes increased when applying cellulose spray.

According to Sharma et al. [3], the tensile strength increased from 15 to 40 N m g−1 using up to 9% CMFs (cellulose microfibrils). In this study, tensile indexes were 14.50 N m g−1 for the soda flax pulp and 12.00 N m g−1 for the kraft pulp. FeTNa-derived nanocellulose increased the tensile strength to 17.04 N m g−1 for the wheat solution and 14.39 N m g−1 for the rapeseed solution, similar to industrial nanofibrils and nanocrystals (14.04 and 15.88 N m g−1, respectively).

Benchmarking against state-of-the-art approaches shows that improvements remain moderate. Zhang et al. [4] reported tensile indexes of 25–30 N m g−1 using CNCs extracted with [Bmim]Cl. Li et al. [46] observed a 50.3% increase in the tensile strength and a 26.3% increase in elongation at break with optimized nanocellulose. Compared to these, FeTNa-derived nanocellulose shows lower absolute performance but offers sustainability and cost advantages.

Relative elongation at break, commonly used to describe maximum strength and flexibility [4], was highest with industrial nanocrystals. FeTNa-treated pulps showed more limited improvements, indicating moderate reinforcement efficiency.

Burst index increased slightly for kraft pulp with FeTNa nanocellulose. By comparison, Sharma et al. [3] reported more substantial enhancements with CMFs, highlighting the gap in absolute mechanical reinforcement, while FeTNa offers environmental and cost benefits.

4.2 Physical/optical performance

As expected, higher concentrations of nanocellulose solution increased the degree of cellulose polymerization, similar to interfacial tension. The viscosity increased with concentration, while no clear dependence was observed for density at these low concentrations.

The optical properties are shown in the figures. Higher values were obtained for the soda-treated flax pulp than for the kraft pulp, probably due to the color of the reference pulp. According to Bekk, surface smoothness did not generally improve when applying the nanocellulose solution, except for kraft pulp treated with nanocrystals. This correlates with the increased surface roughness of laboratory handsheets.

According to the statistical evaluation, all factors are significantly important (Figure 1). The pulp type and nanoparticle materials are statistically significant, with p = 0.00, and concentration is still statistically significant, but with p = 0.02. Sulfate pulp samples are more color-stable compared to sodium pulp samples. This is due to the reference color, which is bright white for sodium pulp samples, so the change after modification is more pronounced. Nanoparticles made from rapeseed input are more color-stable for both pulp types than wheat input. Different concentrations did not significantly affect color change; the changes were statistically significant in sodium pulp samples with wheat input nanoparticles.

Figure 2 shows the concentrations of 0 reference samples without surface modification after UV aging, so that they can be compared with other samples. After UV aging, most results show that sulfate pulp is more color-stable. According to Zmeškal et al. [41], color changes are considered very serious or disturbing, which was expected due to the modification of the dissolved material in the solution.

4.3 FeTNa mechanism

Recent studies have explored surface treatments and nanomaterial additives to enhance the composite performance. Feng et al. [47] demonstrated that surface modification of fibers can improve both damping and mechanical properties. Gong et al. [48] found that interfacial sliding of oriented multilayer graphene oxide significantly enhances damping properties in the composites.

The FeTNa-derived nanocellulose may interact with the fiber network to reinforce hydrogen bonding and create additional interfibrillar entanglements, partially explaining the observed moderate mechanical improvements. Combining FeTNa nanocellulose with surface modifications or nanomaterials could further enhance the mechanical and functional properties [47,48].

4.4 Strengths, limitations, and implications

Although on a laboratory scale, the spray application approach shows potential for industrial translation, it is compatible with roll-to-roll processes used in papermaking and coating lines, enabling continuous application and drying. Future work should focus on viscosity control, drying kinetics, and coating uniformity for scalability.

FeTNa offers a low-cost, sustainable alternative to ionic liquid or enzymatic extractions, making it economically viable for bulk packaging materials. Moderate mechanical and optical improvements may suffice in packaging/barrier applications, especially when combined with environmental benefits from using agricultural residues.

Limitations include lower reinforcement than commercial CNCs/CMFs, potential challenges with long-term stability, recyclability, and large-scale handling. Overall, FeTNa nanocellulose coatings provide moderate improvements but are promising for scalable, cost-efficient, and environmentally friendly industrial applications.

5 Conclusion

This work introduced an innovative and sustainable strategy for producing nanocellulose solutions from wheat and rapeseed residues using the FeTNa method. This study contributes to advancing circular and sustainable material use by converting low-value agricultural by-products into high-value nanomaterials. The FeTNa-derived nanocellulose solutions enhanced the paper’s optical and mechanical properties – especially kraft pulp – while remaining compatible with industrial papermaking processes. Although their reinforcement effect is lower than that of commercial CNCs and CNFs, the approach offers significant cost, environmental impact, and scalability advantages, making it highly relevant for packaging and other large-scale applications.

Future work should focus on tailoring particle morphology, improving coating uniformity, optimizing process parameters such as viscosity and drying kinetics, and assessing long-term stability, recyclability, and safety. Addressing these aspects will be essential for translating FeTNa-derived nanocellulose from laboratory research to industrial implementation.

  1. Funding information: This research was supported by the Faculty of Forestry and Wood Sciences of the Czech University of Life Sciences Prague (Internal Grant Agency, Project No. A_03_24).

  2. Author contributions: Conceptualization: J.B. and K.H.; formal analysis: J.B. and K.H.; investigation: J.B. and K.H.; methodology: J.B., K.H., and A.S.; project administration: K.H.; supervision: K.H.; validation: J.B., K.H., and A.S.; visualization: K.H. and A.S.; writing – original draft: J.B., K.H., and A.S.; writing – review and editing: J.B. and K.H. All authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  3. Conflict of interest: The authors state no conflict of interest.

  4. Data availability statement: The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Received: 2025-03-07
Revised: 2025-09-14
Accepted: 2025-09-28
Published Online: 2025-11-05

© 2025 the author(s), published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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