Application of Raman spectroscopy to analyse lignin/cellulose ratio in Norway spruce tree rings

Vítek, Petr; Klem, Karel; Urban, Otmar

doi:10.11118/beskyd201710010041

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…In the 1317-1477 cm -1 region, bending vibrations of d(CH 2 ), d(HCC), d(HCO) and d(COH) are predominant and appeared in Raman spectra of all cellulose membranes (Wiley and Atalla 1987;Szymańska-Chargot et al 2011). The cellulose band of mediumstrong intensity at * 1096 cm -1 is assigned to the CC and CO stretching motions and some amounts of HCC and HCO bending of glycosidic bonds (Szymańska-Chargot et al 2011;Vítek et al 2017). The intensity of this peak decreases after three steps of modification, indicating the structural changes in the modified Cell-NH 2 and Cell-DTPA fibres.…”

Section: Ftir and Raman Spectroscopymentioning

confidence: 99%

Batch and column adsorption of cations, oxyanions and dyes on a magnetite modified cellulose-based membrane

Perendija

Veličković²,

Cvijetić

et al. 2020

Cellulose

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An optimized method is presented to make magnetite (MG) modified cellulose membrane (Cell-MG) from 3-aminopropyltriethoxysilane and diethylenetriaminepentaacetic acid dianhydride functionalized waste cell fibers; (Cell-NH 2 and Cell-DTPA), and amino-modified diatomite. Functionalized Cell-NH 2 , Cell-DTPA fibers, and diatomite were structurally and morphologically characterized using FT-IR, Raman, and FE-SEM analysis. Amino and carboxyl group content was determined via standard volumetric methods. Response surface method was applied to rationalize the number of experiments related to Cell-MG synthesis and heavy metal ions column adsorption experiments. The effects of pH, contact time, temperature, and initial concentration of pollutants on adsorption and kinetics were studied in a batch, while initial concentration and flow rate were studied in a flow system. The calculated capacities of 88.2, 100.7, 95.8 and 78.2 mg g -1 for Ni 2? , Pb 2? , Cr(VI) and As(V) ions, respectively, were obtained from Langmuir model fitting. Intra-particle diffusion as a rate-limiting step was evaluated from pseudosecond-order and Weber-Morris model fitting. Thermodynamic parameters indicated spontaneous and low endothermic processes. The results from reusability study, wastewater purification and fixed-bed column study proved the high applicability of Cell-MG. Additionally, high removal capacity of four dyes together with density functional theory and molecular interaction fields, help in the establishment of relation between the adsorption performances and contribution of non-specific and specific interactions at adsorbate/ adsorbent interface.

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Section: Ftir and Raman Spectroscopymentioning

confidence: 99%

Batch and column adsorption of cations, oxyanions and dyes on a magnetite modified cellulose-based membrane

Perendija

Veličković²,

Cvijetić

et al. 2020

Cellulose

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“…The Raman spectra of the samples are presented in Figure 2b. The H-veneer exhibits three peaks that can be well indexed as cellulose, together with one large hump belonging to lignin [23,24]. In the P-veneer, the peaks arising from cellulose are located at slightly different positions from that of the H-veneer, which might result from the existence of hemicellulose in the P-veneer.…”

Section: Resultsmentioning

confidence: 99%

Rendering Wood Veneers Flexible and Electrically Conductive through Delignification and Electroless Ni Plating

et al. 2019

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Wood has unique advantages. However, the rigid structure and intrinsic insulating nature of wood limit its applications. Herein, a two-step process is developed to render wood veneers conductive and flexible. In the first step, most of the lignin and hemicellulose in the wood veneer are removed by hydrothermal treatment. In the second step, electroless Ni plating and subsequent pressing are carried out. The obtained Ni-plated veneer is flexible and bendable, and has a high tensile strength of 21.9 and 4.4 MPa along and across the channel direction, respectively, the former of which is considerably higher than that of carbon cloth and graphene foam. Moreover, this product exhibits high electrical conductivity around 1.1 × 103 S m−1, which is comparable to that of carbon cloth and graphene foam, and significantly outperforms previously reported wood-based conductors. This work reveals an effective strategy to transform cheap and renewable wood into a high value-added product that rivals expensive carbon cloth and graphene foam. The obtained product is particularly promising as a current collector for flexible and wearable electrochemical energy storage devices such as supercapacitors and Li-ion batteries.

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“…As for semi-quantitative analytical techniques, the most used in conjunction with CLSM is RAMAN spectroscopy, through which the inelastic dispersion of light is used, and the change in wavelength is detected, which is compiled to obtain information on the excited sample [ 116 ]. One of the advantages is that the analysis can be performed at the same time as CLSM in addition to the fact that it is not a destructive technique, and the material can be analyzed directly and without the need for preparation [ 59 , 116 ]. Other spectroscopic techniques are Fourier transform infrared spectroscopy (FTIR) [ 117 ] and near infrared spectroscopy (NIR) [ 118 ].…”

Section: Complementary Methodsmentioning

confidence: 99%

Fluorescence Microscopy Methods for the Analysis and Characterization of Lignin

Maceda

Terrazas

2022

Polymers

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Lignin is one of the most studied and analyzed materials due to its importance in cell structure and in lignocellulosic biomass. Because lignin exhibits autofluorescence, methods have been developed that allow it to be analyzed and characterized directly in plant tissue and in samples of lignocellulose fibers. Compared to destructive and costly analytical techniques, fluorescence microscopy presents suitable alternatives for the analysis of lignin autofluorescence. Therefore, this review article analyzes the different methods that exist and that have focused specifically on the study of lignin because with the revised methods, lignin is characterized efficiently and in a short time. The existing qualitative methods are Epifluorescence and Confocal Laser Scanning Microscopy; however, other semi-qualitative methods have been developed that allow fluorescence measurements and to quantify the differences in the structural composition of lignin. The methods are fluorescence lifetime spectroscopy, two-photon microscopy, Föster resonance energy transfer, fluorescence recovery after photobleaching, total internal reflection fluorescence, and stimulated emission depletion. With these methods, it is possible to analyze the transport and polymerization of lignin monomers, distribution of lignin of the syringyl or guaiacyl type in the tissues of various plant species, and changes in the degradation of wood by pulping and biopulping treatments as well as identify the purity of cellulose nanofibers though lignocellulosic biomass.

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Application of Raman spectroscopy to analyse lignin/cellulose ratio in Norway spruce tree rings

Cited by 10 publications

References 21 publications

Batch and column adsorption of cations, oxyanions and dyes on a magnetite modified cellulose-based membrane

Batch and column adsorption of cations, oxyanions and dyes on a magnetite modified cellulose-based membrane

Rendering Wood Veneers Flexible and Electrically Conductive through Delignification and Electroless Ni Plating

Fluorescence Microscopy Methods for the Analysis and Characterization of Lignin

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