Resonance Raman Spectroscopy in the Analysis of Residual Lignin and Other Unsaturated Structures in Chemical Pulps
نویسندگان
چکیده
منابع مشابه
New Insights into Chromophore Chemistry of Eucalypt Pulps Assessed by Uv-resonance Raman Micro-spectroscopy
UV-Resonance Raman (UV-RR) spectroscopy with laser beam excitation source of 325 nm was applied to a solid-state study of chromophores in Eucalyptus globulus kraft pulps. The amount of chromophore structures in pre-bleached/fully bleached pulps absorbing at 325 nm linearly correlated with signal at ca 1600 cm in UV-RR spectra. The characteristic vibrations from particular pulp chromophore struc...
متن کاملNeutral Sulfite Treatment of Lignocellulosic Pulps
Birch and eucalyptus kraft pulps were treated with sulfite solutions in neutral conditions (pH 7) at 170 °C for 60 min and at 190 °C for 180 min. The pulps were analyzed for kappa number, viscosity, carbohydrate composition, and optical properties. Additionally, UV resonance Raman (UVRR) spectroscopy was applied to collect information on the contents of hexenuronic acid (HexA), lignin, and its ...
متن کاملEstimation of cellulose crystallinity of lignocelluloses using near-IR FT-Raman spectroscopy and comparison of the Raman and Segal-WAXS methods.
Of the recently developed univariate and multivariate near-IR FT-Raman methods for estimating cellulose crystallinity, the former method was applied to a variety of lignocelluloses: softwoods, hardwoods, wood pulps, and agricultural residues/fibers. The effect of autofluorescence on the crystallinity estimation was minimized by solvent extraction or chemical treatment or both. Additionally, whe...
متن کاملروشهای طیفسنجی در آنالیز همزمان مواد منفجره
Simultaneous analysis of explosives to identify, determine the purity and eliminate environmental pollution requires rapid, simple and cheap methods. Spectrophotometries method (UV-Vis), high-field proton nuclear magnetic resonance (1H-NMR), Raman spectroscopy and near infrared (NIR) are common methods that are applicable in two ways of direct and indirect in simultaneous analysis. In this poin...
متن کاملEffect of Temperature on the Evolution of Physical Structure and Chemical Properties of Bio-char Derived from Co-pyrolysis of Lignin with High-Density Polyethylene
Bio-chars were produced by co-pyrolysis of lignin with high-density polyethylene at 350 °C, 450 °C, and 550 °C. X-ray diffraction (XRD), Raman spectroscopy, automated surface area and pore size analysis, scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and electron spin resonance (ESR) spectroscopy were performed on bio...
متن کامل