An IR study to investigate the structural relationship of lignin-like matter and lignosulphonates obtained from animal-vegetable wastes.
Lignin-like matter (I) from rice hull residues and humin-like matter and (II) from rice hull-fecal matter compost yield, upon sulphonation by SO(3), the lignosulphonates III and IV, respectively. The solid state IR spectra of I and II are analysed and interpreted based on the functional groups content values obtained for III and IV by solution NMR spectroscopy. IR absorbance values at five selected wavelengths for I and II correlate well with functional groups content values for III and IV according to Beer's law. It is concluded that the sulphonated derivatives, aside from the -SO(3)H content, reflect well the chemical structure of the parent materials. No side reaction of I or II with SO(3), other than C sulphonation, is apparent. The above correlation may be useful for waste management purposes.
Montoneri
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Dipartimento di Chimica Generale ed Organica Applicata, Università di Torino, Corso Massimo D'Azeglio 48-10125 Torino, Italy. enzo.montoneri@unito.it
D000383:Agriculture; D008031:Lignin / Q000031:analogs & derivatives* / Q000032:analysis* / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008372:Manure; D012275:Oryza; D012037:Refuse Disposal
D008372:Manure; C001545:lignosulfuric acid; D008031:Lignin