Effect of extraction on the structure and sorption activity of larch bark
This paper presents the results to study the transformation of the structure of larch bark under the influence of "green " low-toxic solvents, such as H2O, C2H5OH, H2O2 and NaOH which revealed the potential for using the bark as a sorbent for special purposes. It was shown by X-ray phase analysis that a shift of the main reflection (002) towards large angles in the spectrum of the extracted bark is observed, which indicates a decrease in the interplanar distances of crystal structures. The greatest transformation with the formation of long-range order structures is observed in the bark treated with hydrogen peroxide. IR spectral analysis revealed "sensitive" functional groups in the structure of the bark which include carboxyl, carbonyl and ester groups contained in lignin and hemi-celluloses. The intensity of the spectral bands of these groups decreases markedly in the spectra of the extracted bark. The most noticeable structural changes offunctional composition are observed in the spectra of the bark extracted with hydrogen peroxide and sodium hydroxide. Sorption activity for iodine has rather high values (more than 150 mg/g) for larch bark before and after extraction and indicate the presence of a microporous structure. The sorption activity for methylene blue increases markedly after the extraction of larch bark. The maximum sorption activity (118 mg/g) is observed in the bark treated with hydrogen peroxide, which is 6.5 times higher than the sorption activity of the original bark. It is assumed that the formation of the mesoporous surface of the extracted bark occurs due to the "soft" transformation of the lignin-cellulose biomass with the formation of long-range order structures and the removal of substances contained in lignin and hemicelluloses of the bark. The presented structural changes and values of sorption activity depending on the type of used extractant indicate the possibility of creating a micro-, mesoporous sorbent by treating the bark with hydrogen peroxide and sodium hydroxide which to the greatest extent contribute to the opening of the mesoporous surface of the bark.
Keywords
morphology,
sorption activity,
structure,
extraction,
larch barkAuthors
| Tsyganova Svetlana I. | Krasnoyarsk Scientific Center SB RAS | light@icct.ru |
| Veprikova Evgenia V. | Krasnoyarsk Scientific Center SB RAS | veprikova2@mail.ru |
| Levdansky Alexander V. | Krasnoyarsk Scientific Center SB RAS | alexsander.l@mail.ru |
| Mazurova Elena V. | Krasnoyarsk Scientific Center SB RAS | len.mazurowa@yandex.ru |
| Taran Oksana P. | Krasnoyarsk Scientific Center SB RAS | taran.op@icct.krasn.ru |
Всего: 5
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