Alkali-Activation of Blast Furnace Slag as Possible Modification for Improving Sorption Properties of Heavy Metals

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F17%3AA1801N05" target="_blank" >RIV/61988987:17310/17:A1801N05 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Alkali-Activation of Blast Furnace Slag as Possible Modification for Improving Sorption Properties of Heavy Metals

Original language description

New direction of research uses the alkali-activated slags as sorbents for removing metals cations from the solution. Slag materials modifiedby alkali-activation were prepared by interaction of blast furnace slag (BFS Basic) with water glass. The prepared alkali-activatedslags were dried under different conditions to form new structure in slag. The slag dried at room temperature for 7 days (AA BFS)and in a dryer at 105°C for 8 hours (AA BFS 105) were prepared and characterized with the aim to study their sorption properties.Characterization of the prepared slags by means of infrared spectrometry (with diffuse reflectance method) demonstrates that thealkaline activation forms a new structure. The new structures are products of hydration processes and structural changes after contactwith water glass. Changes are significant in the comparison with original blast furnace slag. The influence of this new structure onthe sorption properties was studied for the copper Cu(II) and lead Pb(II) cations. The sorption experiments were performed by batchmethod in the aqueous solutions without pH treatment for the concentration range 2-140 mmol/L. The maximum removal amountsof Cu(II) on the alkali-activated slags were almost three times higher and the maximum removal amounts of Pb(II) were at leasttwice higher in comparison to the BFS Basic. Removal efficiency achieved almost 100% to initial concentration 20 mmol/L for Cu(II)and Pb(II). The removal efficiency for both cations decreases with increasing concentration of metals cations. The removal efficiencyis higher for both alkali-activated blast furnace slags in the comparison with BFS Basic. A mechanism of the metal cations removingis influenced by self-alkalization and the removing is mainly due to precipitation and complexation of copper and lead cations on thesurface of slags. The alkaline activated slags can be possibly used for remediation of wastewater containing metals ions.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Inżynieria Mineralna - Journal of the Polish Mineral Engineering Society

ISSN

1640-4920

e-ISSN

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Volume of the periodical

39

Issue of the periodical within the volume

1

Country of publishing house

PL - POLAND

Number of pages

6

Pages from-to

59-64

UT code for WoS article

000407742700011

EID of the result in the Scopus database

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