Kinetic evaluation of tobacco stalk waste exposed to alkaline surface treatment under different conditions

Dallé, Danieli; Hansen, Betina; Zattera, Ademir J.; Francisquetti, Edson Luiz; Catto, André Luís; Borsoi, Cleide

doi:10.1007/s10570-020-03657-x

Cited by 11 publications

(9 citation statements)

References 118 publications

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“…[ 40 ] Finally, the residual at the end of jute fiber degradation represents carbonaceous matter and fillers like inorganic salts, ashes, and molecular fragments. [ 41 ] Further, comparing at 800°C, the value of residue left for the hot water pretreatments was 18.12%, which was lower in comparison with a value of 20.33% for raw jute fibers. For the same temperatures, the reduction in mass loss percentage of hot water treated fibers indicated the removal of the lignin, which degraded in higher temperatures than cellulose and hemicellulose, [ 42 ] as presented in FTIR.…”

Section: Resultsmentioning

confidence: 91%

“…The first method used was the Kissinger method described as the following equation:

\ln \frac{β}{T_{P}^{2}} = \ln \frac{italicAR}{E} - \frac{E}{R T_{normalP}},

where T P is the peak temperature of decomposition reaction at a heating rate of β in the absolute temperature (K). By using this method, as shown in Figure 5, the ln ( β / T p 2 ) against 1/ T p can be linear fitted and the values of E are calculated from the slope of the straight line,

- E / R

.The second method used was the OFW method represented as [ 41 ]

\lg β = \lg (\frac{AE}{italicRg ((), α)}) - 2.315 - 0.4567 \frac{E}{R T_{normalp}},

where

g (α)

is a function of the conversion, when values of α are the same, lg β shows a linear relationship with 1/ T p . As represented in Figure 6, the activation energy E can be calculated according to the linear slope,

- 0.4567 E / R

.The initial degradation temperature ( T 0 ), peak degradation temperature ( T p ) and final degradation temperature ( T f ) with three different heating rates for jute fibers were recorded in Table 3.…”

Section: Resultsmentioning

confidence: 99%

“…where T P is the peak temperature of decomposition reaction at a heating rate of β in the absolute temperature (K). By using this method, as shown in Figure 5, the ln (β/T p 2 ) against 1/T p can be linear fitted and the values of E are calculated from the slope of the straight line, ÀE=R.The second method used was the OFW method represented as [41] lgβ…”

Section: Activation Energy Of Jute Fibersmentioning

confidence: 99%

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Investigation and prediction of mechanical properties of hot water treated jute/poly(lactic acid) composite laminates using response surface methodology and genetic algorithm

Zhang

2022

Polymer Composites

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The main objective of this work was to estimate the usefulness of response surface methodology (RSM) and genetic algorithm (GA) in modeling and predicting the strength of jute/poly(lactic acid) (PLA) composite laminates. Firstly, the impact of the hot water treatment on the thermal, molecular structure, and morphological characterizations as well as kinetic analysis of jute fibers were performed by Thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM). The FTIR results showed that the hot water treatments reduced the content of lignin, hemicellulose, and impurities of the fibers. Hot water treated fibers exhibited higher thermal stabilities compared with untreated fibers as shown with TGA results. The SEM results showed effect contact surface area improved after the hot water treatment, leading to better mechanical properties of bio‐composites. Secondly, the influences of the ply orientation, plies and fiber content on the tensile strength and flexural strength of the hot water treated fibers composites were evaluated by RSM. RSM with the Box Behnken Design was utilized to establish the quadratic models of two objectives in response to input parameters. Analysis of variance (ANOVA) was used to determine percentage contribution of various parameters on two quality objectives. According to the ANOVA results, ply orientation had the most important impact on tensile strength while the ply orientation‐fiber content interaction had the most important impact on flexural strength. Finally, multi‐objective optimization was carried out to maximize tensile strength and flexural strength using the desirability function and GA. The optimized results both showed an acceptable relative error between experimental and optimized values.

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Section: Resultsmentioning

confidence: 91%

“…The first method used was the Kissinger method described as the following equation:

\ln \frac{β}{T_{P}^{2}} = \ln \frac{italicAR}{E} - \frac{E}{R T_{normalP}},

- E / R

.The second method used was the OFW method represented as [ 41 ]

\lg β = \lg (\frac{AE}{italicRg ((), α)}) - 2.315 - 0.4567 \frac{E}{R T_{normalp}},

where

g (α)

- 0.4567 E / R

Section: Resultsmentioning

confidence: 99%

Section: Activation Energy Of Jute Fibersmentioning

confidence: 99%

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Investigation and prediction of mechanical properties of hot water treated jute/poly(lactic acid) composite laminates using response surface methodology and genetic algorithm

Zhang

2022

Polymer Composites

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“…The peak between 3700 and 3000 cm −1 corresponds to the O–H groups in hydrogen bonds of cellulose. [ 9,18,37–39 ] The asymmetric stretching of the CH 2 group is associated with the peak between 3100 and 2900 cm −1 ; there is another peak between 3000 and 2855 cm −1 that corresponds to the vibrations of the elongations of the C–H hybridization group of sp 3 cellulose and hemicellulose. [ 9,40,41 ]…”

Section: Resultsmentioning

confidence: 99%

“…Several studies on the development of methodologies for the reuse of residues recommend using resources with high bioavailability in the environment that are inexpensive, such as yerba mate, [ 8 ] tobacco, [ 9 ] and textile [ 10 ] residues. Meydanju et al.…”

Section: Introductionmentioning

confidence: 99%

Fungicidal Potential of Polymeric Hydrogels Based on Carboxymethylcellulose and Yerba Mate Residues with the Incorporation of Garlic Oil

et al. 2022

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In the present study, hydrogels are developed from carboxymethylcellulose, with the addition of cellulose nanofibers (CNFs) obtained from yerba mate stick residues and garlic oil. CNFs are obtained via physical (steam explosion), chemical (bleaching), and mechanical (ultrafine friction milling) processes. Garlic oil is encapsulated into sodium alginate for the evaluation of fungicidal potential. The samples are assessed for characteristics such as water absorption capacity (swelling) and inhibitory activity against Fusarium sp. FUS147 in vitro by Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). TGA and FTIR spectra confirm the cross-linking mechanism for citric acid in sodium carboxymethylcellulose (CMC) in the hydrogel formation. The incorporation of CNFs, sodium alginate, and garlic oil reduces the temperature at the beginning of thermal degradation, to 47, 38, and 31 °C, respectively, in relation to a hydrogel sample with only carboxymethylcellulose (HC). The swelling analysis reveals an increase of 57% for a sample with CNF, and 42% for a sample with incorporation of garlic oil encapsulated in alginate, in relation to the HC sample. The sample with encapsulated garlic oil shows a high degree of swelling with broad antifungal activity against the Fusarium sp. FUS147, showing great potential for use in agriculture.

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Effect of different modifiers on tobacco stalk fiber/high‐density polyethylene composites

Zhang,

Gao,

et al. 2023

Polymer Engineering & Sci

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Agricultural waste fiber has huge utilization potential due to its abundant sources, renewability, and low recycling costs. In this process, up to 30 wt% tobacco stalk fiber (TSF) was compounded with high‐density polyethylene (HDPE) and interfacial modifiers using a grinder, melting‐blending mixer, and injection molding machine to prepare environmentally friendly TSF/HDPE composites, which have excellent mechanical properties and good water resistance. On this basis, the interfacial compatibility between TSF and HDPE was enhanced by adding a silane coupling agent KH550, titanate coupling agent 201, and maleic anhydride grafted polyethylene (MA‐g‐PE), which led to the improvement of mechanical properties of composites. The mechanical properties of the composites with 2% MA‐g‐PE were the best, while the tensile strength and flexural strength increased by 72% and 38%, respectively, compared with the unmodified composites. Fourier transform infrared (FTIR) spectroscopy showed that TSF was modified by different coupling agents and new chemical bonds were formed. The scanning electron microscopy images showed that the interfacial compatibility between TSF and HDPE was improved by the interface modifiers. This work confirms that it is possible to use TSF to prepare composites and provides a new way for resource utilization of tobacco stalk fiber.Highlights TSF was incorporated into composites, boosting material sustainability. The interface compatibility between TSF and HDPE was greatly improved. Thermal and water absorption analysis can be used for composites design. Composites modified by 2 wt% MA‐g‐PE had optimal comprehensive properties.

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Kinetic evaluation of tobacco stalk waste exposed to alkaline surface treatment under different conditions

Cited by 11 publications

References 118 publications

Investigation and prediction of mechanical properties of hot water treated jute/poly(lactic acid) composite laminates using response surface methodology and genetic algorithm

Investigation and prediction of mechanical properties of hot water treated jute/poly(lactic acid) composite laminates using response surface methodology and genetic algorithm

Fungicidal Potential of Polymeric Hydrogels Based on Carboxymethylcellulose and Yerba Mate Residues with the Incorporation of Garlic Oil

Effect of different modifiers on tobacco stalk fiber/high‐density polyethylene composites

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