DELIGNIFICATION OF PLANT RAW MATERIALS UNDER MICROWAVE IRRADIATION. IR SPECTRA AND ORDERING INDICES OF THE CELLULOSE
| Autor: | Myrzagul Kymbatbekovna Kymbatbekova, Evgeniy Yur'yevich Kushnir, Anastasiya Gennad'yevna Shakhova, Natal'ya Grigor'yevna Bazarnova, Irina Vladimirovna Afanasenkova |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
chemistry.chemical_classification Materials science Organic Chemistry Analytical chemistry Infrared spectroscopy Plant Science 010501 environmental sciences Straw Raw material Polysaccharide 01 natural sciences Biomaterials chemistry.chemical_compound Thermal conductivity chemistry 010608 biotechnology Peracetic acid Cellulose Fourier transform infrared spectroscopy 0105 earth and related environmental sciences |
| Zdroj: | chemistry of plant raw material. :101-107 |
| ISSN: | 1029-5143 1029-5151 |
| DOI: | 10.14258/jcprm.2020048962 |
| Popis: | The effect of plant raw materials delignification with an 18% solution of peracetic acid under microwave irradiation at a frequency of 2450 MHz on the degree of ordering of the cellulose supramolecular structure was studied. The samples of the obtained cellulose were characterized by FTIR spectroscopy. It was found that microwave heating reduces the rate of ordering of the cellulose supramolecular structure in the process of delignification of wood and straw of annual plants with peracetic acid. In general, the delignification products obtained under microwave irradiation with a treatment time of 30 min are characterized by lower values of the ordering index (0.64–0.79) compared to cellulose samples obtained using heating by thermal conductivity (water bath, 100 °С) at processing time 60 min (0.70–0.86). The IR spectra of cellulose samples obtained with the use of heat conduction heating are characterized by a slightly higher intensity of the band at 1372 cm-1 in comparison with the delignification products obtained under microwave irradiation. It has been shown that the degree of ordering of the cellulose supramolecular structure under the studied delignification conditions is determined by the peculiarities of the composition of the feedstock and the polysaccharides supramolecular organization in the native state. For cellulose obtained from wood and straw, different dependences of the values of the ordering index on the heating method and the residual content of hemicelluloses are characteristic. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|