Integrated microwave and alkaline treatment for the separation between hemicelluloses and cellulose from cellulosic fibers

Liu, Yuxin; Sun, Bing; Zheng, Xuefan; Li, Yu; Li, Jianguo

doi:10.1016/j.biortech.2017.08.059

Cited by 62 publications

(22 citation statements)

References 30 publications

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“…In recent researches, microwave pretreatment is often added up with other treatment methods as an upgraded attempt. Liu et al (2018) studied the effect of microwave irradiation during alkaline treatment for the separation of cellulose and hemicellulose from a delignified hardwood kraft pulp. They have found that under microwave treatment the complex fiber structure fractured effectively and the alkaline solution penetrated into the inner fiber structure that resulted in the significant removal of hemicelluloses and high cellulose yield of 93.05%.…”

Section: Microwave Assisted Size Reductionmentioning

confidence: 99%

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

et al. 2018

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Lignocellulosic biomass (LCB) is the most abundantly available bioresource amounting to about a global yield of up to 1. 3 billion tons per year. The hydrolysis of LCB results in the release of various reducing sugars which are highly valued in the production of biofuels such as bioethanol and biogas, various organic acids, phenols, and aldehydes. The majority of LCB is composed of biological polymers such as cellulose, hemicellulose, and lignin, which are strongly associated with each other by covalent and hydrogen bonds thus forming a highly recalcitrant structure. The presence of lignin renders the bio-polymeric structure highly resistant to solubilization thereby inhibiting the hydrolysis of cellulose and hemicellulose which presents a significant challenge for the isolation of the respective bio-polymeric components. This has led to extensive research in the development of various pretreatment techniques utilizing various physical, chemical, physicochemical, and biological approaches which are specifically tailored toward the source biomaterial and its application. The objective of this review is to discuss the various pretreatment strategies currently in use and provide an overview of their utilization for the isolation of high-value bio-polymeric components. The article further discusses the advantages and disadvantages of the various pretreatment methodologies as well as addresses the role of various key factors that are likely to have a significant impact on the pretreatment and digestibility of LCB.

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Section: Microwave Assisted Size Reductionmentioning

confidence: 99%

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

et al. 2018

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“…The efficient extraction of hemicellulose is a prerequisite for high value utilization of woody biomass. Hemicellulose has been extracted by many different methods, i.e., chemical (Jiang et al 2014;Zhang et al 2016;Liu et al 2018), physical (Chandra et al 2015), biological (Kaur et al 2016;Zhou et al 2020), and combined pretreatments (Amidon and Liu 2009). Hydrothermal pretreatment is one of the main physical pretreatment methods (Zhuang et al 2016;Goldmann et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Effect of pH on hemicellulose extraction and physicochemical characteristics of solids during hydrothermal pretreatment of eucalyptus

Yang

Cao

et al. 2020

BioRes

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The effects of pH on residual solids (RS), total dissolved solids (TDS), carbohydrates, and lignin in eucalyptus during hydrothermal pretreatment were studied. The balance between RS and TDS was obtained at pH 4.0 in hydrothermal pretreatment with pre-adjustment pH. The yield of hemicellulose increased, and oligosaccharides dominated. Hemicellulose had the highest dissolution rate, and cellulose and lignin had the lowest dissolution rate at pH 4.0. The crystallinity index (CrI) and structural transformation of lignin was analyzed by X-ray diffraction (XRD) and nuclear magnetic resonance spectroscopy (NMR) with or without pretreatment. The CrI at pH 4.0 was 64.2% higher than that with the traditional hydrothermal pretreatment (62.1%). The β-O-4 bonds, OMe, and phenylcoumarane of lignin were protected. The highest hemicellulose extraction and minimal physicochemical structural changes were obtained at pH 4.0.

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“…Oushabi et al (2017) had investigated the effect of alkaline treatment on the structural, mechanical and thermal properties of natural fibres and the results showed that the removal of the non-cellulose constituents inclusive of hemicelluloses and lignin promotes the tensile strength, interfacial adhesion of the fibre-matrix and thermal resistance of the natural fibres. Meanwhile, a technique that integrates the alkaline and microwave treatments had been introduced by Liu et al (2018) and the findings showed that the microwave treatment significantly ruptured the natural fibre structure and promotes the alkaline solution penetration into the inner natural fibre structure that removes and separates hemicelluloses from cellulose.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alkaline Treatment on Structural Characterisation, Thermal Degradation and Water Absorption Ability of Coir Fibre Polymer Composites

Yew¹,

Muhamad²,

Mohamed³

et al. 2019

JSM

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The alkaline treatment with 5 wt. % sodium hydroxide (NaOH) solution at room temperature for 24 and 48 h was performed on coir fibre. The structural characterisation, thermal degradation and water absorption ability of the untreated and NaOH-treated coir fibre polymer composites have been studied. Scanning electron microscope (SEM) images showed that coir fibres treated with NaOH have rough surface texture and the roughness of the fibre surface becomes significant as the duration of the NaOH treatment increased. Fourier transform infrared (FTIR) spectra confirmed that NaOH treatment removed hemicelluloses as evidenced by the absence of absorption bands at 1724.36 cm-1 and changes the absorption intensity at bands 1244.09 cm-1 and 1249.87 cm-1 due to the loss of lignin. NaOH-treated coir fibre composites demonstrated better thermal stability at low temperature degradation. At high temperature, the thermal stability was reduced due to the decreased of residual lignin content. The water absorption of the NaOH-treated coir fibre composites was lower than untreated coir composite contributed by better interfacial adhesion between the NaOH-treated coir fibre to epoxy resin.

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Integrated microwave and alkaline treatment for the separation between hemicelluloses and cellulose from cellulosic fibers

Cited by 62 publications

References 30 publications

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

Effect of pH on hemicellulose extraction and physicochemical characteristics of solids during hydrothermal pretreatment of eucalyptus

Effect of Alkaline Treatment on Structural Characterisation, Thermal Degradation and Water Absorption Ability of Coir Fibre Polymer Composites

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