Vibrational spectroscopy and X-ray diffraction methods to establish the differences between hardwood and softwood

Popescu, Carmen Mihaela; Singurel, Gh.; Popescu, Maria-Cristina; Vasile, Cornelia; Argyropoulos, Dimitris S.; Willför, Stefan

doi:10.1016/j.carbpol.2009.03.011

Cited by 199 publications

(91 citation statements)

References 17 publications

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“…For all samples, the bands around 2910 to 2930 cm -1 are attributed to C-H n asymmetric stretching present mainly in cellulose, which was the major component of the lignocellulosic fibers 21,26 . The band near 1735 cm -1 assigned to unconjugated stretching vibrations of the C=O of the carbonyl and acetyl groups in the xylan component of hemicellulose was clearly seen on PCF fibers and it was observed as a shoulder for RH fibers [27][28][29][30] .…”

Section: Fourier-transform Infrared Spectroscopy (Ftir)mentioning

confidence: 94%

“…Absence of the peak at 1735 cm -1 leads to the hypothesis that RTF has undergone to alkaline scouring so most of the hemicelluloe were removed. The three fibers show a peak at about 1640 cm -1 related to absorbed water 21,[31][32][33] The bands at the region from 1000 to 1500 cm -1 are assigned to the aromatic region related to the lignin: the bands at 1460, 1425 and 1220 cm -1 are characteristic of C-H and C-O deformation, bending or stretching vibrations of many groups in lignin and other carbohydrates 28,29,34 . Cellulose show bands characteristics at 1055 and 1162 cm -1 attributed to C-OR stretching and antisymetric bridge C-OR-C stretching of cellulose, respectively 28 .…”

Section: Fourier-transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

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Characterization of Fibers from Pineapple's Crown, Rice Husks and Cotton Textile Residues

Prado

Spinace

2015

Mat. Res.

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Fibers from pineapple's crown (PCF), rice husks (RH) and cotton textile residues (RTF) were characterized by SEM, X-ray diffraction, FTIR and thermogravimetric analysis. Moisture content, water absorption, density and the distribution of the diameter of the fibers were also evaluated. RTF showed cylindrical microstructure with smooth surface, PCF showed cellular structure and the microstructure of RH is globular, showing cell pattern of the outer surface epidermis which is well organized and has a corrugate structure. PCF and RH showed crystallographic planes of cellulose I and RTF showed a mixture of cellulose I and cellulose II. RTF showed the highest degree of crystallinity and the lower moisture content and water absorption. These results occur because the RTF has no hemicellulose, as verified by FTIR. Comparing the three fibers, the RTF presented the lowest density and diameter. Furthermore, the onset degradation temperature of RTF was 40 °C higher than the PCF and the RH.

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Section: Fourier-transform Infrared Spectroscopy (Ftir)mentioning

confidence: 94%

Section: Fourier-transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

Characterization of Fibers from Pineapple's Crown, Rice Husks and Cotton Textile Residues

Prado

Spinace

2015

Mat. Res.

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“…Compared with the bands of cellulose I, a new band related to intermolecular hydrogen bonding of 2-OH···O-2′ and/or intermolecular hydrogen bonding of 6-OH··O-2′ in cellulose II appears at around 3115cm -1 after NaOH treatment (Oh et al 2005). In this study, the FTIR spectra were resolved by using the PeakFit software's Gaussian function (Maréchal and Chanzy 2000;Popescu et al 2009) to differentiate the hydrogen bond types. Assuming that all the vibration modes follow a Gaussian distribution, mixed modes of hydrogen bonded O-H stretching were resolved into three bands for cellulose I and four bands for cellulose II.…”

Section: Content Of Different Hydrogen Bond Models Of Deinked Pulp Fimentioning

confidence: 95%

“…"Hydrogen bonds & deinking," BioResources 8(2), 2398-2416. 2400 distribution function, the FTIR spectra region of 3800 to 3000 cm -1 was resolved into three or four bands to distinguish the relative contributions of different hydrogen bonds (Maréchal and Chanzy 2000;Oh et al 2005;Popescu et al 2009). Furthermore, XRD and CP/MAS 13 C NMR were used to determine the supramolecular structure of cellulose, including the crystallinity, crystal size, and the content of polymorphs (Wan et al 2010;Miyamoto et al 2011;Hult et al 2002).…”

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confidence: 99%

Effects of Different Deinking Processes on Fiber Morphology, Hydrogen Bond Models, and Cellulose Supramolecular Structure

Meng

Wan

et al. 2013

BioResources

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Deinked pulp fibers produced by three kinds of deinking processes, alkaline deinking, neutral deinking, and enzymatic deinking, were studied by Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectrometer (FTIR), X-ray Diffraction (XRD), and CrossPolarization Magic Angle Spinning Carbon-13 Nuclear Magnetic Resonance (CP/MAS 13 C-NMR). There were remarkable differences in both macroscopic and microscopic structure between the samples. SEM images showed that the effects of deinking processes on fiber morphology were obvious and the influences of alkaline deinking were the most apparent. FTIR analysis indicated that the content of intermolecular hydrogen bonds increased by 22.63%, 9.42%, and 14.40% after the alkaline deinking process, neutral deinking process, and enzymatic deinking process, respectively. XRD revealed that the average width of crystallite size in the (002) lattice plane was decreased after different deinking processes, in accordance with the change tendency of cellulose crystallinity. CP/MAS 13 C NMR combined with spectral fitting demonstrated that the content of different cellulose polymorphs changed during deinking processes. The increase of WRV was attributed to changes in the hydrogen bonding patterns and cellulose supramolecular structure. Technology, Guangzhou 510640, PR China; c: School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, PR China; *Corresponding author:mwizard@126.com Keywords INTRODUCTIONWith the demand of protecting forest resources and developing a low-carbon economy, secondary fiber recycling has aroused the attention of technologists throughout the world, and the rapid growth of the waste paper utilization has become an important trend of the world's paper industry. According to the statistics of the China Paper Association, the total consumption of pulp from wastepaper in the paper industry was 44.39 million tons in 2008 in China. In 2011 it increased to 56.60 million tons, accounting for 62% of total pulp consumption (China Paper Association). Recycled cellulose fiber accounted for about 70% of the papermaking materials by the end of the 20 th century (Wan and Ma 2004). This recycled material can help make up for an insufficient supply of fresh papermaking raw materials, can reduce energy consumption in comparison to the pulping of wood, and also can play an essential role in decreasing environmental pollution problems. Deinking is an important stage in secondary fiber PEER-REVIEWED ARTICLE bioresources.com Meng et al. (2013). "Hydrogen bonds & deinking," BioResources 8(2), 2398-2416. 2399recycling. Conventional deinking processes often employ sodium hydroxide in combination with a large amount of other chemicals, including sodium silicate, hydrogen peroxide, and surfactants (Shrinath et al. 1991). This high pH and chemical-intensive process leads to several major problems for the process and recycled paper quality, including a high degree of fragmentation of large sticky contaminants, darkening of pu...

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“…Figure 2(a) shows the ATR-FTIR of untreated and treated kempas wood which displays the appearance of several peaks similar to the basic structure of all wood samples. The peaks observed were the strong broad peak at 3349 cm -1 representing the OH stretching of cellulose, hemicellulose and lignin, C-H stretching at 2902 cm -1 of methyl and methylene group (Poletto et al 2012;Popescu et al 2009) and C=O stretching of carbonyl in carbohydrate (Poletto et al 2012;Popescu et al 2009). There were also several peaks representing the lignin such as peaks at 1597, 1511 and 1235 cm -1 depicting the C=C, C-O stretching or bending vibration and peak at 1455 cm -1 representing the asymmetric bending of CH 3 while methoxy (-OCH 3 ) group presence in the lignin.…”

Section: Structural Characterization Of Soaked Kempas Wood Chipmentioning

confidence: 99%

Effects of Soaking in Glycerol and Conventional Solvents on the Grinding of Kempas Wood (Koompassia malaccensis)

PohLee

Azlina

Suhaili

et al. 2018

JSM

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Vibrational spectroscopy and X-ray diffraction methods to establish the differences between hardwood and softwood

Cited by 199 publications

References 17 publications

Characterization of Fibers from Pineapple's Crown, Rice Husks and Cotton Textile Residues

Characterization of Fibers from Pineapple's Crown, Rice Husks and Cotton Textile Residues

Effects of Different Deinking Processes on Fiber Morphology, Hydrogen Bond Models, and Cellulose Supramolecular Structure

Effects of Soaking in Glycerol and Conventional Solvents on the Grinding of Kempas Wood (Koompassia malaccensis)

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