A research of chemical nature and surface properties of plant disperse fillers
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Дата
2020
ORCID
https://orcid.org/0000-0003-3865-2496
https://orcid.org/0000-0002-7726-0359
https://orcid.org/0000-0001-7486-482X
https://orcid.org/0000-0002-5239-6364
https://orcid.org/0000-0001-6934-2349
https://orcid.org/0000-0002-3803-4156
https://orcid.org/0000-0003-1902-5809
https://orcid.org/0000-0001-8490-0695
https://orcid.org/0000-0002-7393-9268
https://orcid.org/0000-0003-0670-4052
https://orcid.org/0000-0002-7726-0359
https://orcid.org/0000-0001-7486-482X
https://orcid.org/0000-0002-5239-6364
https://orcid.org/0000-0001-6934-2349
https://orcid.org/0000-0002-3803-4156
https://orcid.org/0000-0003-1902-5809
https://orcid.org/0000-0001-8490-0695
https://orcid.org/0000-0002-7393-9268
https://orcid.org/0000-0003-0670-4052
DOI
doi.org/10.15587/1729-4061.2020.193383
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
PC Technology Center
Анотація
Chemical nature and surface properties of plant disperse fillers are investigated: buckwheat (BH) and oat (OH) husk, wood (WF) and conifer flour (CF). Using IR spectroscopy, it was found that oxygen-containing atomic groups –OH, –C–O–, –C=O prevail in the filler components. It was found that a hydroxyl-hydrate layer of functional groups is present on the surface of air-dry fillers. By potentiometric titration of aqueous suspensions using the Parks–Bobyrenko method, it was determined that all fillers are of the "polyfunctional solid" type. It is shown that the hydroxyl-hydrate surface layer consists of functional groups with similar values of acid-base characteristics. Functional groups of acidic nature were additionally found on the surface of the fillers: groups with pKa≈4.37−5.66 on the BH surface, groups with pKa≈4.49−4.90 on the CF surface and groups with pKa≈3.91−4.30 on the WF surface. As a result of potentiometric titration, it was shown that the surface acidity of the fillers decreases in the WF>CF>BH>ОH series, which coincides with the one in which the total cellulose and lignin content decreases, and the resistance of fillers to thermal-oxidative breakdown increases. It was found that the rate of hydrolytic processes in aqueous suspensions at the interface decreases in the ОH>CF>BH>WF series and inversely depends on the concentration of functional groups on the surface of the fillers, and also that the change in the rate of hydrolytic processes at the interface depending on the content of fillers is described by step functions. It is revealed that for the effective use of the studied disperse waste in composite materials and as adsorbents for the extraction of pollutants, dispersion media with the following ranges of the hydrogen index are required: for BH − pH>4.4; OH − pH>6.4; WF − pH>3.9; CF − pH>4.5. The results obtained make it possible to predict and control acid-base interfacial interactions, as well as reasonably approach the development of new effective technologies.
Опис
Ключові слова
plant waste, surface, chemical nature, functional group, acid-base characteristics
Бібліографічний опис
A research of chemical nature and surface properties of plant disperse fillers / Yu. Danchenko [et al.] // Eastern-European Journal of Enterprise Technologies. – 2020. – Vol. 1, No. 6 (103). – P. 32-41.