S. Werle1, Ł. Ziółkowski1, C. Tomescu2, V. Rusu1, A. Milandru1
1) Silesian University of Technology, Institute of Thermal Technology, Gliwice, PL; 2) Institute for Studies and Power Engineering, Bucharest, RO
USE OF THE FT-IR TECHNIQUE FOR TESTING HEAVY METAL CONTAMINATED ENERGY CROPS
Spectroscopic methods are one of the most popular tools for identifying and analyzing the organic compounds structure. They are characterized by high speed of measurement and a small amount of material necessary for testing. Attenuated Total Reflectance (ATR) is a relatively new technique for infrared spectroscopy. In contrast to classical transmission measurement, the ATR technique is a reflexive method. Its advantage is the lack of sample preparation and the possibility of testing various materials containing organic carbon such as biomass. In the paper, the FTIR analyzes of two energy crops feedstock were carried out: (1) grass Miscanthus x giganteus, MG – representative of the monocotyledonous plant, and (2) perennial plant Sida hermaphrodita, SH – representative of the diocotyledonous plant. Spectra were recorded using the Spectrum GX spectrometer with the ATR supplement from Perkin Elmer company with the 32 scans and a 4 cm-1 resolution. Analysis of the spectra of both biomass samples indicates the presence of the groups -OH (3415 cm-1 for MG and 3412 cm-1 for SH ). In addition, C = O (1733 cm-1 for MG and 1735 cm-1 for SH ) are also present in ketones and quinones, C-C-O, C-H from aromatic rings and CH2 from saturated compounds. In addition, the spectra of both biomass samples were compared with library spectral masses of the coarse cardboard and cellulose with lignin. The similarity coefficient for MG is 87% for coarse cardboard and 85% for lignin and cellulose, and for SH - 86% for coarse cardboard and 81% for lignin and cellulose.
Keywords: FTIR-ATR, energy crops, Miscanthus x giganteus, Sida hermaphrodita
Acknoledgments: The paper has been prepared within the frame of the FP7-People-2013-IAPP (GA No610797) Phyto2Energy Project