Influence of γ-ray radiation on the structure and properties of paper grade bamboo pulp

Yang, Gesheng; Zhang, Yaopeng; Wei, Mengyuan; Shao, Huili; Hu, Xuechao

doi:10.1016/j.carbpol.2010.02.003

Cited by 20 publications

(20 citation statements)

References 17 publications

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“…14,22 Compared with untreated MCC (0 kGy), Fig. 25 The assignments of all these peak wavenumbers as reported in the ref. Furthermore, the band at around 3300 cm À1 attributed to the vibration of hydrogen bonded OH-groups rst shis to a lower wavenumber (at 200 kGy) and then to a higher wavenumber when the absorbed dose exceeds 400 kGy.…”

Section: Resultsmentioning

confidence: 97%

Insights into the effects of γ-irradiation on the microstructure, thermal stability and irradiation-derived degradation components of microcrystalline cellulose (MCC)

Liu

Chen

et al. 2015

RSC Adv.

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It has been demonstrated that radiation pretreatment can cause a significant breakdown of the stubborn cellulose structure, which will increase the accessibility of cellulose and enhance enzyme hydrolysis in bio-fuel processes. In this study, using microcrystalline cellulose (MCC) as a model substrate, the impacts of irradiation dose on the microstructure, thermal stability and irradiated-degradation components of cellulose under 60 Co g-irradiation (0-1400 kGy) was comprehensively investigated. FT-IR, EPR and NMR analyses show that irradiation destroys the glycosidic bond and inter-and intramolecular hydrogen bond of cellulose, resulting in the generation of reductive carbonyl groups and free radicals. SEM, XRD and GPC analyses confirm that irradiation can damage the crystalline microstructure and surface morphology of MCC, which reduces its degree of polymerization from 183 045 kDa to 4413 kDa. TGA and DGA curves indicate that the activated energy (E a ) and thermal stability of treated MCC decrease with the increasing irradiation dose. Ion chromatography (IC) analysis demonstrates that there exist fermentation sugars such as glucose (10.73 mg g À1 ), xylose (1.58 mg g À1 ), arabinose (0.46 mg g À1 ), fructose (4.31 mg g À1 ), and cellobiose (1.90 mg g À1 ) as well as low amounts of glucuronic acid (0.35 mg g À1 ) and galacturonic acid (1.46 mg g À1 ) in the irradiation-derived degradation components. Therefore, the findings in this study suggest that g-irradiation processing is an environment-friendly, promising and effective approach to treat lignocellulose biomass.

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Section: Resultsmentioning

confidence: 97%

Insights into the effects of γ-irradiation on the microstructure, thermal stability and irradiation-derived degradation components of microcrystalline cellulose (MCC)

Liu

Chen

et al. 2015

RSC Adv.

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“…Evidently, the latter are responsible for the observed increase in the overall carbonyl values. From the literature, results from wide-angle X-ray diffraction (WAXD) and Fourier transform infrared spectroscopy (FTIR) show that the crystalline structures of bamboo cellulose were not destroyed with an absorbed dosage of irradiation ranging from 0 to 60 kGy [ 20 ]. It must be concluded that oxidation by electron beaming under the pertinent conditions also affected the crystalline areas without significantly changing the crystalline structure.…”

Section: Resultsmentioning

confidence: 99%

Electron Beam Irradiation of Cellulosic Materials—Opportunities and Limitations

et al. 2013

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Abstract:The irradiation of pulp is of interest from different perspectives. Mainly it is required when a modification of cellulose is needed. Irradiation could bring many advantages, such as chemical savings and, therefore, cost savings and a reduction in environmental pollutants. In this account, pulp and dissociated celluloses were analyzed before and after irradiation by electron beaming. The focus of the analysis was the oxidation of hydroxyl groups to carbonyl and carboxyl groups in pulp and the degradation of cellulose causing a decrease in molar mass. For that purpose, the samples were labeled with a selective fluorescence marker and analyzed by gel permeation chromatography (GPC) coupled with multi-angle laser light scattering (MALLS), refractive index (RI), and fluorescence detectors. Degradation of the analyzed substrates was the predominant result of the irradiation; however, in the microcrystalline samples, oxidized cellulose functionalities were introduced along the cellulose chain, making this substrate suitable for further chemical modification.

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“…The results show that the relative crystallinity index did not change strongly, and that is in accordance with the results from X-ray diffraction analysis (Table 2). Also the results from other studies depicted that the crystallinity of cellulose is not significantly affected by gamma ray irradiation [7,27]. Nevertheless, Baccaro et al [28] and Charlesby [8] analysed the influence on the cellulose crystallinity of high ionising radiation.…”

Section: Chemical and Structural Analysismentioning

confidence: 91%

“…However, the different determinations varied from method to method and no uniform results can be observed. The relative crystallinity index (H1370/2900) of cellulose is determined from the IR absorptions [27] and listed in Table 2. The values of the relative crystallinity index correspond with the sum of cellulose I and cellulose II contents.…”

Section: Chemical and Structural Analysismentioning

confidence: 99%