Compositional changes of rice straw fibers after pretreatment with diluted acetic acid: Towards enhanced biomethane production

Peng, Jingjing; Abomohra, Abd El‐Fatah; Elsayed, Mahdy; Zhang, Xiuzhi; Fan, Qizhou; Ai, Ping

doi:10.1016/j.jclepro.2019.05.155

Cited by 67 publications

(20 citation statements)

References 49 publications

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“…On the other hand, comparing the PEC-6h-3% and purified pectin micrographs, a notable difference due to a presence of lignocellulose residues on the PEC-6h-3% surface can be seen. Thus, it is possible to conclude that the purification and centrifugation treatments allow large fat-soluble and lignocellulose residue fractions to be removed, causing evident morphological changes [ 64 ].…”

Section: Resultsmentioning

confidence: 99%

Citrus Pomace Biomass as a Source of Pectin and Lignocellulose Fibers: From Waste to Upgraded Biocomposites for Mulching Applications

et al. 2021

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Citrus pomace derived from the industrial processing of juice and essential oils mostly consists of pectin, cellulose, hemicellulose, and simple sugars. In this work, citrus pomace waste from an agricultural company in South Italy was used as source of pectin. The extraction conditions of the polysaccharide were optimized using a suitable combination of time and a concentration of a mild organic solvent, such as acetic acid; thus recovering high Mw pectin and bioactive molecules (flavonoids and polyphenols). The pectin was structurally (GPC, FTIR), morphologically (SEM), thermally (TGA/DTG), and mechanically characterized, while bioactive molecules were separated and the total phenolic content (TPC) and total flavonoids content (TFC) were evaluated. With the aim to develop novel biocomposite-based materials, the pectin extracted from citrus waste was reinforced with different amounts of lignocellulose fractions also recovered from citrus waste after polysaccharide extraction, according to a “zero waste” circular economy approach. The prepared biocomposites were morphologically and mechanically characterized to be used as biodegradable mulching systems for crop protection. Thus, the citrus waste biomass was recovered, fractionated into its main raw materials, and these were recombined to develop novel upgraded biocomposites for mulching applications, by means of a cost-effective and eco-sustainable approach.

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Section: Resultsmentioning

confidence: 99%

Citrus Pomace Biomass as a Source of Pectin and Lignocellulose Fibers: From Waste to Upgraded Biocomposites for Mulching Applications

et al. 2021

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“…A number of studies have reported that organic acid pretreatment of the biomass needs high temperature and pressure. 31 In this study, CH 3 COOH pretreatment under low temperatures would reduce energy consumption, and we used the same conditions as those for the other acids to investigate the impact of various acids on the pretreatment of switchgrass. The result showed that CH 3 COOH has little effect on the residual cellulose and lignin in treated samples ( Figure 1 ).…”

Section: Resultsmentioning

confidence: 99%

“…It is reported to facilitate the release of natural organic acids from the biomass and the organic acids act as a natural catalyst for the rupture of the lignin–carbohydrate complex. A number of studies have reported that organic acid pretreatment of the biomass needs high temperature and pressure . In this study, CH 3 COOH pretreatment under low temperatures would reduce energy consumption, and we used the same conditions as those for the other acids to investigate the impact of various acids on the pretreatment of switchgrass.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study on Pretreatment Processes for Different Utilization Purposes of Switchgrass

et al. 2020

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Switchgrass ( Panicum virgatum , L., Poaceae) with the advantages of high cellulose yield, and high growth even under low input and poor soil quality, has been identified as a promising candidate for production of low-cost biofuels, papermaking, and nanocellulose. In this study, 12 chemical pretreatments on a laboratory scale were compared for different utilization purposes of switchgrass. It was found that the pretreated switchgrass with sodium hydroxide showed considerable potential for providing mixed sugars for fermentation with 11.10% of residual lignin, 53.85% of residual cellulose, and 22.06% of residual hemicellulose. The pretreatment with 2.00% (v/v) nitric acid was the best method to remove 78.37% of hemicellulose and 39.82% of lignin under a low temperature (125 °C, 30 min), which can be used in the production of nanocellulose. Besides, a completely randomized design analysis of switchgrass pretreatments provided the alternative ethanol organosolv delignification of switchgrass for the papermaking industry with a high residual cellulose of 58.56%. Finally, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR) were carried out to confirm the changes in functional groups, crystallinity, and thermal behavior of the three materials, respectively, from the optimal pretreatments.

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“…Sometimes, SEM is used to identify the existence of channels and cavities and evaluate the size of the adsorbent's particles. For instance, the SEM analysis of the microstructures of rice straw before and after modification of with 2% acetic acid for 24 h. Unmodified rice straw fibers were smooth and well-ordered whereas, before modification, rice straw fibers were coarse and disordered with visible cusps on the surface, indicating partial lignin breakdown during pretreatment [90].…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Acid modification of lignocellulosic derived material for dye and heavy metals removal: A review

Akindolie

Choi

2022

Environmental Engineering Research

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Researchers have tested Lignocellulose derived material (LDMs) from different sources ranging from agricultural to wood in order to facilitate the adsorption of chemical contaminants, such as heavy metals and dyes from water bodies, to eradicate water contamination. However, different methods have been employed to modify the nature of the LDMs to enable their suitability for contaminants removal. Among all these methods, acid modification of LDMs has gained a lot of attention. This review focused on the use of acid modification LDMs for the removal of anionic and cationic dyes, and heavy metals in water. The characteracerization techniques employed in studying the morphology and functional groups of the LDMs were discussed. The adsorption dynamics and mechanisms of reported studies were extensively summarized. The reported adsorption capacity of unmodified LDMs in the available liturature is in the range of 4.44–156.00 mg/g while for the modified is between 80.05–250.01 mg/g for dye removal. The adsorption capacity of modified LDMs reported was 1.60–18.03 times higher than the unmodified because of additional functional groups such as -SO<sub>3</sub> from sulphuric acid modification. Finally, the future outlook and challenges of this method were pulled together.

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Compositional changes of rice straw fibers after pretreatment with diluted acetic acid: Towards enhanced biomethane production

Cited by 67 publications

References 49 publications

Citrus Pomace Biomass as a Source of Pectin and Lignocellulose Fibers: From Waste to Upgraded Biocomposites for Mulching Applications

Citrus Pomace Biomass as a Source of Pectin and Lignocellulose Fibers: From Waste to Upgraded Biocomposites for Mulching Applications

Comparative Study on Pretreatment Processes for Different Utilization Purposes of Switchgrass

Acid modification of lignocellulosic derived material for dye and heavy metals removal: A review

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