| Autor: |
Matveev, E. V., Gajdar, A. I., Lapshinov, B. A., Mamontov, A. V., Berestov, V. V. |
| Zdroj: |
Inorganic Materials: Applied Research; Apr2022, Vol. 13 Issue 2, p549-559, 11p |
| Abstrakt: |
We report on the results of a comparative study of the structural and physicochemical characteristics of cotton fiber samples carbonized by the microwave and conventional thermal methods. The temperature evolution of the samples during the microwave carbonization process has been established. The morphological heterogeneity of the fiber surface over the microwave-carbonized sample cross section has been found. It is shown that fibers of the surface layers are subjected to the destruction of two kinds: (i) numerous transverse brittle fractures and fiber coloring at the places of swelling (a sharp increase in the fiber diameter) and (ii) fluffing of the surface into twisted fibrils with a transverse size of 50–300 nm due to destruction of the outer layers of a fiber secondary wall. In the central part of a sample, fibers are destructed via the formation of longitudinal interfibrillary slits and stratification of the fiber secondary wall, which leads to the formation of pores 50–200 nm in size. It has established that, during the microwave carbonization process, the central part of a sample is almost completely freed up of impurities, which are deposited onto fibers of the surface layers. It is demonstrated that the integral adsorption capacity of the microwave-carbonized sample is higher than the adsorption capacity of the sample carbonized by the thermal method (126 and 47 mg/g, respectively). It has been found that, under microwave exposure for more than 10 min, areas with an adsorption capacity of about 350–450 mg/g arise in the carbonized material, which is comparable with the value for the samples activated by the conventional method. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink