Fractionation of green coconut fiber using sequential hydrothermal/alkaline pretreatments and Amberlite XAD-7HP resin

Padilha, Carlos Eduardo de Araújo; Nogueira, Cleitiane da Costa; Filho, Marcos Antônio Oliveira; Júnior, Francisco Canindé de Sousa; Assis, Cristiane Fernandes de; Souza, Domingos Fabiano de Santana; Oliveira, Jackson Araújo de; Santos, Everaldo Silvino dos

doi:10.1016/j.jece.2019.103474

Cited by 27 publications

(14 citation statements)

References 46 publications

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“…Several authors have used this model in adsorption [20,21,[29][30][31][32][33][34] and desorption processes [35] to describe the diffusional control. Figure 7 depicts the adsorption and desorption experimental data and values from Equation (14). In all depicted series (Figure 7) the trend is similar, and it is possible to distinguish two stages that are more evident at higher initial concentrations of CA.…”

Section: Sorption Control Mechanismsmentioning

confidence: 75%

“…For the resins performance study, five resins were tested: S 2328, S6328 A, S7968, XAD 7HP, and XAD 16HP N. These resins were selected based on previous studies on the recovery of different bioactive compounds present in foods and their wastes [10][11][12][13][14][15][16][17][18].…”

Section: Adsorbentsmentioning

confidence: 99%

“…Several authors have used this model in adsorption [20,21,[29][30][31][32][33][34] and desorption processes [35] to describe the diffusional control. Figure 7 depicts the adsorption and desorption experimental data and values from Equation (14). Wu, Tseng, and Juang (2009) [31] defined a parameter, Rp, to understand the behavior of the sorption process (Equation ( 16)).…”

Section: Sorption Control Mechanismsmentioning

confidence: 99%

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Characterization of Ionic Exchange and Macroporous Resins for Their Application on the Separation and Recovery of Chlorogenic Acid from the Wastewater of Artichoke Blanching

Rodriguez-Lopez

Reig

Mayor³

et al. 2021

Sustainability

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Food wastes have traditionally been considered as dead-end materials; however, recent international, national, and regional policies strongly promote the use of these wastes as potential resources. This change of perception considers the need for sustainable exploitation of natural resources. In this context, artichoke processing produces high amounts of wastewaters, and specifically, wastewaters from the artichoke blanching step present a high content of valuable biocomponents such as carbohydrates and phenolic compounds (e.g., chlorogenic acid, 1700 ppm). In this work, the recovery of chlorogenic acid by applying sorption processes was studied. Five resins were tested, and it was found that the resin XAD 7 HP presented the best total adsorption-desorption yield (72.8%) at 20 °C. It was also found that there was a strong variation of the adsorption ratio depending on solution pH (3–7). Four models of isotherms were applied to the adsorption processes, and the Langmuir isotherm better explained the adsorption behavior. The kinetic study showed that the adsorption and desorption of chlorogenic acid followed a pseudo-second order model where the kinetic constant depended on the adsorbate concentration. In addition, it was found that the sorption process was controlled by more than just the intraparticle diffusion mechanism.

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Section: Sorption Control Mechanismsmentioning

confidence: 75%

Section: Adsorbentsmentioning

confidence: 99%

“…Several authors have used this model in adsorption [20,21,[29][30][31][32][33][34] and desorption processes [35] to describe the diffusional control. Figure 7 depicts the adsorption and desorption experimental data and values from Equation (14). Wu, Tseng, and Juang (2009) [31] defined a parameter, Rp, to understand the behavior of the sorption process (Equation ( 16)).…”

Section: Sorption Control Mechanismsmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of Ionic Exchange and Macroporous Resins for Their Application on the Separation and Recovery of Chlorogenic Acid from the Wastewater of Artichoke Blanching

Rodriguez-Lopez

Reig

Mayor³

et al. 2021

Sustainability

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show abstract

“…In the production of cellulosic ethanol, pretreatment steps are crucial to reducing the biomass recalcitrance and, consequently, increase its enzymatic digestibility [5,6]. The use of pretreatments focusing on delignification has become popular in cellulosic ethanol schemes since the high lignin content limits accessibility to cellulose fibers and can lead to non-productive adsorption of cellulases [7][8][9][10][11]. After the delignification, the pretreated lignocellulosic biomasses are directed to the enzymatic hydrolysis followed by fermentation, while the lignin from the liquid fraction is considered a cheap source of energy [12].…”

Section: Introductionmentioning

confidence: 99%

Production and Application of Lignin-Based Chemicals and Materials in the Cellulosic Ethanol Production: An Overview on Lignin Closed-Loop Biorefinery Approaches

Padilha

Nogueira

Alencar

et al. 2021

Waste Biomass Valor

Self Cite

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Lignocellulosic biomass is the most abundant biological resource on the planet and has been extensively researched to produce cellulosic ethanol. However, there is a consensus that the presence of lignin hinders the biomass conversion. Lignin is often considered a villain in cellulosic ethanol production studies due to its adverse effects on cellulases and yeasts. Despite this, recent studies indicate that lignins can be transformed into useful inputs to produce cellulosic ethanol. These approaches aim to establish closed-loop biorefineries to improve economic metrics and reduce the environmental impact due to the substitution of products based on fossil sources. The present review addresses the successful cases in transforming lignin into chemicals and materials to increase cellulosic ethanol titers. A contextualization was first carried out, considering aspects of biomass characteristics and lignin valorization. The impact of lignin-based chemicals and materials in the pretreatment, detoxification, and enzymatic hydrolysis steps was discussed in detail. Economic aspects and future perspectives were also included in this review. These reports open a new point of view on lignin valorization and its integration with the cellulosic ethanol production chain.

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“…Schwartz and Lawoko [ 26 ] reported that XAD-4 adsorption could remove 100% of furan derivatives and 90% of acid-soluble lignin from the extracts of mixed hardwood chips. Padilha et al [ 27 ] discovered that 72.33% phenolic compounds could be removed from hydrothermal pretreatment liquor of green coconut fiber by using XAD-7HP resin. Koivula et al [ 28 ] used XAD-16 and XAD-7HP resin to purify wood autohydrolysates as the pretreatment for ultrafiltration and found that both resins could effectively remove ligneous material, thereby enhancing ultrafiltration capability.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Study of Lignin Removal from Recycled Alkali Black Liquor by Adsorption Resins for Improved Cellulase Hydrolysis of Corn Straw

Fang

Zhou

et al. 2020

Molecules

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Previous studies showed that aromatic compounds such as lignin, phenols, and furans were main inhibitors of cellulase hydrolysis in recycled alkali black liquor (RBL), which should be removed to improve alkali utilization. In this study, three polymeric resins, XAD-4, XAD-16N, and XAD-7HP, were evaluated for their abilities to remove lignin from alkali black liquor recycled at the third time. Adsorption conditions of adsorbent dose and equilibrium time, isotherms, and kinetics were investigated. Of three tested adsorbents, XAD-16N was the most efficient, which can remove 89.84% of lignin after adsorption at an adsorbent-to-solution ratio of 1:4 for 2.5 h. Pseudo-second-order model was efficient to represent XAD-16N and XAD-7HP adsorption kinetics. Adsorption behavior of XAD-4 on RBL was fitted better to Langmuir model, while XAD-16N and XAD-7HP adsorption were more consistent with Freundlich model. The cellulase hydrolysis rate of corn straw treated with RBL after XAD-16N adsorption combined with ozone was 86.89%, which was only 0.89% lower than that of sodium hydroxide combined with ozone treatment. Structure characterization proved that the damage of XAD-16N adsorbed RBL to corn straw was similar to that of sodium hydroxide. It indicated that adsorption was effective in inhibitor removal from RBL to improve alkali utilization.

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Fractionation of green coconut fiber using sequential hydrothermal/alkaline pretreatments and Amberlite XAD-7HP resin

Cited by 27 publications

References 46 publications

Characterization of Ionic Exchange and Macroporous Resins for Their Application on the Separation and Recovery of Chlorogenic Acid from the Wastewater of Artichoke Blanching

Characterization of Ionic Exchange and Macroporous Resins for Their Application on the Separation and Recovery of Chlorogenic Acid from the Wastewater of Artichoke Blanching

Production and Application of Lignin-Based Chemicals and Materials in the Cellulosic Ethanol Production: An Overview on Lignin Closed-Loop Biorefinery Approaches

Adsorption Study of Lignin Removal from Recycled Alkali Black Liquor by Adsorption Resins for Improved Cellulase Hydrolysis of Corn Straw

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