Structural modifications of Tilia cordata wood during heat treatment investigated by FT-IR and 2D IR correlation spectroscopy

Popescu, Maria-Cristina; Froidevaux, Julien; Navi, Parviz; Popescu, Constantin

doi:10.1016/j.molstruc.2012.08.035

Cited by 148 publications

(84 citation statements)

References 24 publications

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“…In the PA spectra, an absorption band between 1750 and 1600 cm −1 is observed. This band is assigned to C=O present in carbonyls, ketones, aldehydes, or ester groups and to C=C present in olefinic vibrations in aromatic region (Popescu et al 2013). The aromatic structure is also confirmed in this sample by the strong absorption band visualized at around 1060 cm −1 that indicates the presence of lignin.…”

Section: Resultssupporting

confidence: 54%

Nitrate Uptake from Water by Means of Tailored Adsorbents

Nunell

Fernández

Bonelli

et al. 2015

Water Air Soil Pollut

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Two different adsorbents directed to nitrate removal from water were developed from Parkinsonia aculeata wood. An activated carbon was obtained by chemical activation with K 2 CO 3 at 800°C, whereas another adsorbent was prepared using a dilute solution of NH 4 Cl at 450°C. Elemental compositions, surface functional groups, and textural parameters of both adsorbents were determined and compared with those of a commercial activated carbon used as a reference. Nitrate adsorption assays were carried out to examine the effects of solution pH, adsorbent dosage, contact time, and equilibrium adsorption isotherms. The adsorbent obtained with K 2 CO 3 showed a well-developed pore structure (S BET =777 m 2 /g; V T =0.35 cm 3 /g) and neutral character, while the one prepared with NH 4 Cl exhibited a low porous development (S BET =58 m 2 /g; V T =0.03 cm 3 /g), acidic nature, and a noticeably high N content. The latter attained the highest nitrate removal efficiency, with a maximum adsorption capacity (X mL =0.40 mmol/g) higher than those estimated for the former (X mL =0.34 mmol/g) and the commercial sample (X mL =0.23 mmol/g), pointing to a predominant role of the chemical surface characteristics, mainly of N-containing groups and basic functionalities. Accordingly, the adsorbent obtained with NH 4 Cl represents a friendly novel material especially suited for nitrate removal.

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Section: Resultssupporting

confidence: 54%

Nitrate Uptake from Water by Means of Tailored Adsorbents

Nunell

Fernández

Bonelli

et al. 2015

Water Air Soil Pollut

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“…The chemical or physical characteristics of wood surfaces affect the gluing and coating processes, while the decorative surface of wooden wares attracts consumers to purchase them. Existing studies have shown that chemical, physical, and structural properties of a heat-treated wood surface also change during heat treatment (Inari et al 2006;Popescu et al 2011;Popescu et al 2013;Li et al 2015). Wood surfaces turn out to be warmer and more attractive because of the formation of degradation products from hemicelluloses, changes in extractives, and the formation of oxidation products such as quinones (Dubey et al 2012;Wastiels et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristics of Poplar Wood with High-Temperature Heat Treatment: Wettability and Surface Brittleness

et al. 2016

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The many uses of wood are greatly affected by its surface properties, which are significantly altered by heat treatment. Investigated here are the wettability and surface brittleness when treating poplar wood with heat at 160, 180, 200, and 220 °C for 2 h. Contact angles were measured by the sessile drop method, and surface free energy was calculated. Surface brittleness was expressed by hardness (HD value), roughness (Ra, Rq, Ry, and Rz values), and abrasive resistance (K value). Next, non-destructive Fourier transform near-infrared spectroscopic (FT-NIR) and X-ray photoelectron spectroscopic (XPS) measurements were employed to analyze the surface chemical changes. Scanning electron microscopy (SEM) revealed the post-heating microscopic structure. The results demonstrated that heat treatment reduces the surface wettability while increasing the surface brittleness, which becomes more apparent with increased temperature. Significant differences were determined (p < 0.05) between the surface parameters at four different temperatures. The degradation of cell wall components and the deterioration of microstructures was further expounded by FT-NIR, XPS, and SEM analyses. Furthermore, the abrasive resistance and hardness values decreased in line with the rate of weight loss (WL, %) and temperature. This indicates a strong correlation between the surface characteristics and the WL or temperature. The intensity of heat treatment appears to be predictable and easy to regulate.

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“…The peak at 1034 cm −1 was attributed to C-O-C stretching of aliphatic ether bond [4]. In comparison with the undyed wood, the -OH band was broader in the case of dyed wood, which could be caused by different types of inter-and intramolecular hydrogen bonds [38,39]. Besides, the 1740 cm −1 band declined clearly after the conventional dyeing treatment, suggesting the degradation of hemicellulose [40].…”

Section: Ftir Analysismentioning

confidence: 96%

Evaluation of ultrasonic-assisted dyeing properties of fast-growing poplar wood treated by reactive dye based on grey system theory analysis

Wang

Zhang

et al. 2018

J Wood Sci

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Ultrasonic-assisted dyeing as a novel and eco-friendly method was utilized to improve decorative value of fast-growing tree species. The effects of ultrasonic-assisted dyeing parameters (e.g., temperature, dye concentration, ultrasonic power, dipping time, dyeing assistant and dye-fixing agent) on the properties of wood were investigated, and the parameters were optimized. Moreover, the main factors mentioned above were determined with grey system theory analysis. Analyses of chemical structure, thermostability, crystallinity, and microscopic morphologies were conducted using fourier transform infrared spectroscopy (FTIR), thermogravimetric (TG), X-ray diffraction (XRD), and scanning electron microscope (SEM), respectively. Results showed that dye uptake and K/S were influenced by the parameters in the following order: dye concentration > dye-fixing agent > dyeing assistant > dipping time > ultrasonic power > temperature. FTIR indicated that an ether bond was formed between the wood component and the reactive dye. TG and XRD demonstrated that the thermal stability and crystallinity of ultrasonic-assisted dyed wood were both improved. SEM revealed that dye molecules diffused into the cell cavity, wood vessel, aperture, and part of the wood microstructure such as pit membrane, which was mechanically damaged after the ultrasonic-assisted dyeing treatment and created new fluid channels for the dye.

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Structural modifications of Tilia cordata wood during heat treatment investigated by FT-IR and 2D IR correlation spectroscopy

Cited by 148 publications

References 24 publications

Nitrate Uptake from Water by Means of Tailored Adsorbents

Nitrate Uptake from Water by Means of Tailored Adsorbents

Surface Characteristics of Poplar Wood with High-Temperature Heat Treatment: Wettability and Surface Brittleness

Evaluation of ultrasonic-assisted dyeing properties of fast-growing poplar wood treated by reactive dye based on grey system theory analysis

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