Investigation of pretreatment parameters in the delignification of paddy husks with deep eutectic solvents

Okur, Müjgan; Koyuncu, Dilşad Dolunay Eslek

doi:10.1016/j.biombioe.2020.105811

Cited by 33 publications

(8 citation statements)

References 34 publications

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“…As most lignocellulosic biomasses, RHs are an intricate material where all the components are closely related to each other. For that reason, in order to separate and quantify the four main constituents of rRH and pRH of this study (hemicellulose, cellulose, silica, and lignin), a multistep process based on a classical method of fractionation by successive water and acid treatments was performed (see Section 3.3 for details) [33]. The composition of the presently studied biomasses is reported in Table 1 and appears to be in agreement with those reported in the literature [34,35].…”

Section: Rice Husks Compositionsupporting

confidence: 75%

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Fractionation of Raw and Parboiled Rice Husks with Deep Eutectic Solvents and Characterization of the Extracted Lignins towards a Circular Economy Perspective

et al. 2022

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In the present work, rice husks (RHs), which, worldwide, represent one of the most abundant agricultural wastes in terms of their quantity, have been treated and fractionated in order to allow for their complete valorization. RHs coming from the raw and parboiled rice production have been submitted at first to a hydrothermal pretreatment followed by a deep eutectic solvent fractionation, allowing for the separation of the different components by means of an environmentally friendly process. The lignins obtained from raw and parboiled RHs have been thoroughly characterized and showed similar physico-chemical characteristics, indicating that the parboiling process does not introduce obvious lignin alterations. In addition, a preliminary evaluation of the potentiality of such lignin fractions as precursors of cement water reducers has provided encouraging results. A fermentation-based optional preprocess has also been investigated. However, both raw and parboiled RHs demonstrated a poor performance as a microbiological growth substrate, even in submerged fermentation using cellulose-degrading fungi. The described methodology appears to be a promising strategy for the valorization of these important waste biomasses coming from the rice industry towards a circular economy perspective.

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Section: Rice Husks Compositionsupporting

confidence: 75%

“…The rRH and pRH compositions have been determined with a known multistep procedure with minor modifications [33]. The RH (1 g, value a) was suspended and stirred in deionized water (150 mL) at 100 • C for 1 h. Then, after filtration, the solid was washed by deionized water (300 mL), dried in an oven at 80 • C, and weighted (value b).…”

Section: Methodsmentioning

confidence: 99%

Fractionation of Raw and Parboiled Rice Husks with Deep Eutectic Solvents and Characterization of the Extracted Lignins towards a Circular Economy Perspective

et al. 2022

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“…These findings suggest that in addition to removal of extractives, the lignocellulosic structure was disrupted, with a portion of the lignin and hemicellulose no longer shielding the cellulose in the biomass. For rice husks, beech wood, loblolly pine, tree heather, and gum rockrose, other researchers have reported lignin removal with DES pretreatment [10,[20][21][22]. Lignin has also been reported to be effectively removed from maritime pine wood sawdust and pine wood powder [18,23].…”

Section: Fiber Analysismentioning

confidence: 99%

Pretreatment of Loblolly Pine Tree Needles Using Deep Eutectic Solvents

Gujjula

Kumar

Lynam

2021

Biomass

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Deep eutectic solvents (DES) are new ‘green’ solvents that have a high potential for biomass processing because of their low cost, low toxicity, biodegradability, and easy recycling. When Loblolly pine trees are harvested, their branches with needles are typically left in brush piles and decompose very slowly. Exploring the effect of DES pretreatment on waste pine needles was the goal of the present work. Loblolly pine needles were treated with three types of DES to prepare the biomass for enzymatic hydrolysis to glucose, a subject not readily found in the literature. The resulting products were analyzed by Fourier transform infrared spectroscopy, fiber analysis, and high-performance liquid chromatography. Glucose yields after pretreatment and hydrolysis were found to be six times that for untreated biomass with two of the DES. Fiber analysis indicated removal of lignin, hemicellulose, and ash from the needle biomass. Enhanced glucose yield was due to removal of lignin and disruption of biomass structure during pretreatment, so that the pretreated biomass was rich in cellulosic content. Based on the results shown in this study, among the three types of DES, formic acid:choline chloride and acetic acid:choline chloride pretreatment had better potential for biomass pretreatment compared to lactic acid:choline chloride.

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“…It is very difficult to directly selectively depolymerize cellulose and hemicellulose in lignocellulosic biomass to monomeric or low molecular weight chemicals. That is why it is necessary to undergo a pretreatment step before the enzymatic hydrolysis of cellulose and, consequently, its subsequent fermentation for the production of bioethanol (Okur & Koyuncu, 2020). Expanding the surface area of the biomass, dissolving hemicellulose and/or lignin, and reducing the particle size of the biomass are shown as the most important targets in the pretreatment step (Kandanelli et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…DESs have low vapor pressure, chemical and thermal stability, low melting point, adjustable physical and chemical properties, low toxicity and biodegradability. In addition, they can be prepared through an easy preparation process consisting of mixing and heating steps (Okur & Koyuncu, 2020). DESs consist of two or more different compounds that function as hydrogen bond acceptors (HBA) and hydrogen bond donors (HBD).…”

Section: Introductionmentioning

confidence: 99%

Pretreatment of Paddy Husk Used for Bioethanol Production with Deep Eutectic Solvent

Turan¹,

Okur²,

Koyuncu³

2022

bes

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Agricultural wastes as lignocellulosic biomass have shown good potential for producing bioethanol. There are three main steps in the production of bioethanol from lignocellulosic biomass; pretreatment, hydrolysis, and fermentation. Expanding the surface area of biomass, dissolving hemicellulose and/or lignin, and reducing the particle sizes of biomass are the most important goals of the pretreatment stage. Deep eutectic solvents (DES) are used widely in the pretreatment of lignocellulosic biomass. In this study, the deep eutectic solvent (DES) was used in the pretreatment of paddy husk. The effect of molar ratios of ChCl/Boric acid (1:1, 1:2, 2:1) on lignin removal percentage was investigated. As a result, the highest lignin removal percentage was obtained as 8.5% by using the molar ratio of 1:1. Obtained results were confirmed by ATR/FT-IR analyses.

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Investigation of pretreatment parameters in the delignification of paddy husks with deep eutectic solvents

Cited by 33 publications

References 34 publications

Fractionation of Raw and Parboiled Rice Husks with Deep Eutectic Solvents and Characterization of the Extracted Lignins towards a Circular Economy Perspective

Fractionation of Raw and Parboiled Rice Husks with Deep Eutectic Solvents and Characterization of the Extracted Lignins towards a Circular Economy Perspective

Pretreatment of Loblolly Pine Tree Needles Using Deep Eutectic Solvents

Pretreatment of Paddy Husk Used for Bioethanol Production with Deep Eutectic Solvent

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