Adsorption of Fe3+ ions onto carbon powder followed by adsorbent electroflotation

Gaydukova, A.; Kon’kova, T.; Kolesnikov, V.; Anastasia, P.

Авторы: Gaydukova Anastasia, Kon’kova Tatiana, Kolesnikov Vladimir, Anastasia Pokhvalitova
Журнал: Environmental Technology & Innovation
Том: 23
Год издания: 2021
Издательство: Elsevier B.V.
Местоположение издательства: Netherlands
Первая страница: 1
Последняя страница: 10
Номер статьи: 101722
DOI: 10.1016/j.eti.2021.101722
Аннотация: The work carried out studies on the adsorption process of Fe3＋ ions from aqueous solutions of chloride, nitrate and sodium sulfate salts in a batch process. Based on the obtained Fe adsorption isotherms, a conclusion is made about a possible specific sorption mechanism. The simplified Boehm method was used to determine the number of basic and acidic functional groups on the surface of the investigated sorbent. The presence of functional groups on the surface of the coal is confirmed by IR spectrometry data. It was found that the adsorption value of Fe in solutions of sodium sulfate was reduced, possibly due to the competing chemisorption of the anion. As a result of adsorption, the degree of purification of the solution from iron ions comes up to 96%–98% at an initial concentration of up to 100 mg/l. To extract the spent carbon sorbent from aqueous solutions, an electroflotation method was proposed and the process conditions were selected. The range of initial concentrations of coal was determined up to 0.6 g/L in Na2SO4 solution and up to 1 g/L in NaCl and NaNO 3 solutions, in which the degree of sorbent extraction is more than 80%. It was found that the maximum value of the degree of coal extraction is reached after 5 min from the start of the process in a solution of Na2SO4 and NaNO 3 ( - 96%) and after 20 min in a solution of NaCl () in an acidic media. Anions of background electrolytes affect the formation of the ”particle-gas bubble” flotation complex, the determining stage of the electroflotation process.
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Adsorption of Fe3+ ions onto carbon powder followed by adsorbent electroflotationстатья