Modification of xylan in alkaline treated bleached hardwood kraft pulps as classified by attenuated total-internal-reflection (ATR) FTIR spectroscopy

Chen, Zhiwen; Hu, Thomas Q.; Jang, Ho Fan; Grant, Edward R.

doi:10.1016/j.carbpol.2015.03.084

Cited by 37 publications

(20 citation statements)

References 26 publications

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“…, which are typical of xylan (Gao et al 2014;Chen et al 2015). The peak at 1139 cm -1 corresponded to the stretches of C-C in the main chain, while the peak at 1627 cm -1 corresponded to carboxylate (C=O) in the salt or ester form of the xylan side chains (Deng et al 2014).…”

Section: Characteristics Of the Extracted And Modified Xylan From Blamentioning

confidence: 99%

A Novel Xylan-Polyvinyl Alcohol Hydrogel Bead with Laccase Entrapment for Decolorization of Reactive Black 5

Bankeeree¹,

Prasongsuk²,

Imai³

et al. 2016

BioResources

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In an attempt to find a more efficient technique for biodegradation of the recalcitrant Reactive Black 5 (RB-5) dye, a composite xylan-polyvinyl alcohol (xylan-PVOH) hydrogel was used to immobilize laccase from the white-rot fungus Trametes versicolor. Xylan was prepared from the black liquor of pulp and paper effluent, and it was esterified with citric acid prior to cross-linking with polyvinyl alcohol (PVOH). The optimum composition for the immobilized laccase bead formation consisted of 4% (w/v) modified xylan, 10% (w/v) PVOH, and 15 U.mL -1 crude laccase. The maximum decolorization of RB-5 (98.45  1.96 %) was obtained within the first cycle (6 h) at 40 °C. In the eighth cycle, the reused beads were able to decolorize 55.35  2.46 % of the RB-5. Moreover, the xylan-PVOH beads extended the optimum pH range of laccase activity from 6 to 10 and tolerated a temperature up to 10 °C higher than that of the free enzyme. These results suggest that the xylan-PVOH bead has great potential as the polymer matrix for enzyme immobilization, which has applications in wastewater treatment.

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Section: Characteristics Of the Extracted And Modified Xylan From Blamentioning

confidence: 99%

A Novel Xylan-Polyvinyl Alcohol Hydrogel Bead with Laccase Entrapment for Decolorization of Reactive Black 5

Bankeeree¹,

Prasongsuk²,

Imai³

et al. 2016

BioResources

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“…Hemicellulose in eucalyptus (hardwood) is basically formed by glucuronoxylans. According to Chen et al (2015), xylan content in eucalyptus varies between 11 and 22 wt%, while for pine, being a softwood, galactoglucomannan only reaches 6-10%, as experimentally determined by Reyes et al (2013). Xylans are the most reactive components within the torrefaction temperature range, and hence they degrade faster than any other solid wood component (Prins et al, 2006b;Basu, 2013); therefore, even when both pine and eucalyptus have similar hemicellulose contents (Table 1), the mass yield is rather different.…”

Section: Experimental Torrefactionmentioning

confidence: 94%

Torrefaction of Pinus radiata and Eucalyptus globulus: A combined experimental and modeling approach to process synthesis

Arteaga-Pérez

Segura

Espinoza

et al. 2015

Energy for Sustainable Development

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“…The CH 2 wagging vibrations at 1312 cm −1 ; and the shoulder peak near 1730 cm −1 [42] are strong indications of cellulose and hemicellulose (salt or ester form), respectively. The signal at 1604 cm −1 is assigned to the aromatic skeletal vibration mode of lignin [43] and the C=O vibration of lignin and hemicellulose [44]. Other band assignments include the weak 1371 cm −1 as aliphatic CH 3 deformation and 1243 cm −1 as C-O stretching of cellulose and hemicellulose [45], which will disappear in biochars prepared above the cellulose devolatilization temperature.…”

Section: Proximate Crude Fiber and Elemental Analysismentioning

confidence: 99%

Biochar from co-pyrolysis of urban organic wastes—investigation of carbon sink potential using ATR-FTIR and TGA

Nair

Mondal

Weichgrebe

2020

Biomass Conv. Bioref.

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Urban organic wastes (UOW) strain the infrastructures for solid waste treatment (SWT) in emerging economies. This study investigated biochar gained from three major UOW sources in India—banana peduncles (BP), a fibrous waste, from fruit markets; sewage sludge (SS) from wastewater treatment plants; and anaerobic digestate (AD) from food and market waste processing facilities—in terms of its potential to sequester and become long-term carbon sink in soils. Herein, the chemical properties (using ATR-FTIR) and thermal oxidative stability (using TGA) of biochars derived from these UOW and their three blends were examined. Biochar from SS and AD and the blends were found to possess more ash content, Cl, and alkali and alkaline earth metals (AAEM) than that from BP. The conventional recalcitrance index (R50) could not quantify and compare the stability of these mineral- and ash-rich biochars. Hence, a modified thermal oxidative recalcitrance index (TORi) is proposed. All the biochar from blends prepared at highest treatment temperature of 650 °C shows similar aromaticity. However, biochar from blend of 50% SS, 30%BP, and 20% AD exhibits the highest recalcitrance (TORi = 0.193) to become a long-term carbon sink in soil. More than aromaticity, the influence of Si, Fe, and AAEM on the biochar matrix affects its recalcitrance. Variations in the structural properties and recalcitrance of biochars from blends are attributable to the synergy among their constituents SS, AD, and BP. The determined TORi confirms the potential of biochar from the blends of UOW as a long-term carbon sink.

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Modification of xylan in alkaline treated bleached hardwood kraft pulps as classified by attenuated total-internal-reflection (ATR) FTIR spectroscopy

Cited by 37 publications

References 26 publications

A Novel Xylan-Polyvinyl Alcohol Hydrogel Bead with Laccase Entrapment for Decolorization of Reactive Black 5

A Novel Xylan-Polyvinyl Alcohol Hydrogel Bead with Laccase Entrapment for Decolorization of Reactive Black 5

Torrefaction of Pinus radiata and Eucalyptus globulus: A combined experimental and modeling approach to process synthesis

Biochar from co-pyrolysis of urban organic wastes—investigation of carbon sink potential using ATR-FTIR and TGA

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