The aim of this study was to investigate the effects oxygen and moisture content (MC) on chemical color changes black locust (Robinia pseudoacacia) wood during heat treatment. flour conditioned different initial MCs heated for 24 h at a constant temperature 120ºC in either or nitrogen atmosphere. pH values chromaticity indexes were examined. Diffuse reflectance UV-Vis (DRUV) Fourier transform infrared (FTIR) spectra used characterize chromophores upon heating. demonstrated that decreased...

In this study, hemp stem was used to prepare high surface area activated carbon (AC) by KOH activation. The structure, characterization, thermal and structure analysis on reaction mechanisms of AC were investigated via N2 adsorption–desorption isotherm, Fourier transform infrared (FTIR) spectroscopy thermogravimetric-mass (TG-MS) spectrometry. Results show that when the impregnation ratio is 4.5:1 (KOH/char), activation temperature 800 °C, time 1.5 h, has highest specific 2388 m2·g−1...

Nitrogen functional groups were introduced by urea and melamine onto the surface of two bamboo processing residues derived activated carbons (ACs) Cr(<sc>vi</sc>) adsorption was investigated changing various parameters.

This study investigated weathering performance of an HDPE wood plastic composite reinforced with extracted or delignified flour (WF). The was pre-extracted three different solvents, toluene/ethanol (TE), acetone/water (AW), and hot water (HW), sodium chlorite/acetic acid. spectral properties the composites before after artificial under accelerated conditions were characterized by Fourier transform infrared (FTIR) spectroscopy, surface color parameters analyzed using colorimetry, mechanical...

Nitrogen-doped activated carbon/reduced graphene oxide composites are prepared by pre-carbonization of the precursors (mixture and nitrogen-doped carbons) KOH activation pyrolysis products.

Ultrasound pretreatment of wood prior to drying was examined as a method increase the effective water diffusivity, reduce time, and improve product quality Chinese Catalpa wood. Pretreatment tests were carried out at three durations, absolute pressure levels, ultrasonic intensities. All specimens then dried 60°C level 0.02 MPa determine effects parameters on vacuum characteristics. A microscopic analysis visualize formation microchannels view any other changes tissue structure that occurred....

Graphene was manufactured from commercial kraft lignin, and its forming mechanism, structure, properties were investigated. A single factor test employed to determine the optimum conditions of production graphene nanosheets. Kraft lignin mixed with iron powders as catalyst different weight ratios. The carbon source thermally treated at 1000 °C incubated for a period time in tubular furnace. materials analyzed by field emission scanning electron microscopy (FE-SEM), Raman spectroscopy, atomic...

In this paper, litchi-like microspheres structures of NiCo2Se4@carbon (NCSC) hybrids were successfully synthesized via a simple two-step hydrothermal method. The effects the content NiCo2Se4 on structure NCSC composites are investigated. morphology and nanostructure as-obtained examined by XRD, XPS, FESEM TEM. results indicate that carbon (CM) uniformly covered with increase content, superficies also exhibits homogeneous rough nanoparticles regular spheres connect each other. Meanwhile,...

To extend the potential application of ultrasonic treatment in dyeing lowquality wood to improve decorative value, veneers were dyed with an assisted system.The effects power, dye concentration, time, and temperature ultrasonic-assisted on dye-uptake, chromatic crystallinity, thermal stability, chemical structure, microstructure for veneer investigated.The rate improved by treatment.The effect was strengthened increase time temperature.After treatment, properties such as lignin degradation,...

The color changes corresponding to chromophore structures in lignin caused by exposure of Eucalyptus (Eucalyptus grandis and E. urophylla) heat were investigated. wood powders treated under saturated steam atmospheres for 10 h at 110 °C, 130 °C 150 °C. was isolated before after treatment. physicochemical properties the during treatment evaluated through wet chemical analysis, Fourier transform infrared spectroscopy (FTIR), diffuse reflectance ultraviolet-visible (DRUV-Vis), gel permeation...

Waste fiberboards were used to produce N, O co-doped carbon dots (CDs) by acid etching method. The graphene hydrogels decorated with CDs (GCD) synthesized via hydrothermal method and optimized through different mass ratios. optimal composite electrode exhibited a high specific capacitance of 335.1 F g−1 at 1 A g−1, good mechanical flexibility about 90.6% retention after 500 bending/unbending cycles. Furthermore, the assembled flexible supercapacitor owned an ideal cycling stability 83.4%...

To investigate the effects of phenolic extractives on discoloration black locust wood (Robinia pseudoacacia) during heat treatment, compounds were extracted using an accelerated solvent extraction. The main components analyzed. treated at 120 and 140 °C in nitrogen, oxygen, saturated steam. results showed that a* values shifted toward red b* yellow after treatment. changes color parameters more pronounced when samples steam compared with treatment oxygen or nitrogen atmosphere. During...