A comprehensive characterization of chemically treated Brazilian sponge-gourds (Luffa cylindrica)

Tanobe, Valcineide Oliveira de Andrade; Sydenstricker, T. H. D.; Munaro, Marilda; Amico, Sandro Campos

doi:10.1016/j.polymertesting.2004.12.004

Cited by 238 publications

(168 citation statements)

References 19 publications

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“…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] . 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.…”

Section: Fourier-transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…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 . The peak at 1320 cm -1 is attributed to the O-H of alcohol groups and the band at 1420-1430 cm -1 is assigned to aromatic skeletal vibrations associated to C-H in plane deformation of cellulose.…”

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: 99%

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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“…Hitherto, the most common fibre reinforcements used in geopolymer composites are based on carbon, basalt, and glass fibres [8][9][10][11][12], but concerns over the environment and non-biodegradability have made renewed interest recently in replacing the synthetic fibres used in geopolymer or other brittle matrices with natural plant  fibres. These include flax, hemp, jute, pineapple, straw, switch grass, kenaf, coir, and bamboo [13,14]. These plant fibres cost less, have low density, and display good mechanical properties when compared with industrial fibres [15].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

et al. 2015

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This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites. Geopolymer composites reinforced with 2.4, 3.0 and 4.1 wt% woven flax fabric in various layers were fabricated using a hand lay-up technique and tested for mechanical properties such as flexural strength, flexural modulus, compressive strength, hardness, and fracture toughness. All mechanical properties were improved by increasing the flax fibre contents, and showed superior mechanical properties over a pure geopolymer matrix. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) studies were carried out to evaluate the composition and fracture surfaces of geopolymer and geopolymer/flax composites. The thermal behaviour of composites was studied by thermogravimetric analysis (TGA) and the results showed significant degradation of flax fibres at 300 ℃.

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“…The strong absorption band at 1639 cm -1 is indicative of OH bending vibrations, while that at 1401 cm -1 is due to C-O stretching. The band at 1322 cm -1 is assigned to C-O groups on the biomass surface, whereas that at 1160 cm -1 corresponds to antisymmetric bridge C-OR-C stretching (cellulose) [37,38]. The band at 1107 cm -1 is attributed to anhydroglucose ring (cellulose) [38].…”

Section: Ft-ir Analysis Of the Biosorbentmentioning

confidence: 99%

“…The band at 1107 cm -1 is attributed to anhydroglucose ring (cellulose) [38]. The peaks at 1058 cm -1 are indicative of C-OR stretching (cellulose), while the band at 884 cm -1 could be attributed to antisymmetric, out of phase ring stretching [37].…”

Section: Ft-ir Analysis Of the Biosorbentmentioning

confidence: 99%

Biosorption of cationic dye from aqueous solutions onto lignocellulosic biomass (Luffa cylindrica): characterization, equilibrium, kinetic and thermodynamic studies

et al. 2016

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In the present study, biomass fiber (Luffa cylindrica) has been successfully used as biosorbent for the removal of a cationic dye namely, methylene blue, from aqueous solution using a batch process. The characterization of the biosorbent was carried out by the infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The chemical composition has been established by the energy dispersive X-Ray spectroscopy (EDS). The effects of various parameters such as the contact time (0-160 min), solution pH (2-10), biosorbent dose (0.5-8 g L -1 ), particle size, initial MB concentration (20-300 mg L -1 ) and temperature (20-60°C) were optimized. The biosorption isotherms were investigated by the Langmuir, Freundlich, Dubinin-Radushkevich and Tempkin models. The data were well fitted with the Langmuir model, with a maximum biosorption capacity of 49.46 mg g -1 at 20°C. The kinetics data were analyzed by the pseudo-first-order and pseudo-second-order models. The mass transfer model in terms of interlayer diffusion was applied to examine the mechanisms of the rate-controlling step (R 2 = 0.9992-0.9999). The thermodynamic parameters: free energy (DG°= -5.428 to -3.364 kJ mol -1 ), enthalpy (DH°= -20.547 kJ mol -1 ) and entropy (DS°= -0.052 kJ mol -1 K -1 ) were determined over the temperatures range (20-60°C). The results indicate that Luffa cylindrica could be an interesting biomass of alternative material with respect to more costly adsorbents used nowadays for dye removal.

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A comprehensive characterization of chemically treated Brazilian sponge-gourds (Luffa cylindrica)

Cited by 238 publications

References 19 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

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

Biosorption of cationic dye from aqueous solutions onto lignocellulosic biomass (Luffa cylindrica): characterization, equilibrium, kinetic and thermodynamic studies

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