Alkali-activated geopolymers based on calcined phosphate sludges and metakaolin

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F24%3A00587593" target="_blank" >RIV/67985891:_____/24:00587593 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s11356-024-34025-y" target="_blank" >https://doi.org/10.1007/s11356-024-34025-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11356-024-34025-y" target="_blank" >10.1007/s11356-024-34025-y</a>

Result language

angličtina

Original language name

Alkali-activated geopolymers based on calcined phosphate sludges and metakaolin

Original language description

The extraction of phosphorite ore in Tunisia has resulted in the discharge of substantial amounts of phosphatic sludge into the region’s water system. To mitigate this environmental issue and prevent heavy metal leaching, a geopolymerization process was employed using two types of Tunisian calcined phosphate sludges (Cal-PS1 and Cal-PS2) as substitutes for alkali-activated metakaolin. This study aimed to investigate and compare the physical and mechanical properties of the resulting geopolymers. The optimal substitution ratio of metakaolin with calcined phosphate sludge was determined to be 1.5, equivalent to 20 wt.% of calcined phosphate sludge. Compressive strength tests conducted after 28 days of curing revealed values of 37 MPa for Cal-PS1 specimens and 28 MPa for Cal-PS2 geopolymers while compressive strength of geopolymers soaked in water for 28 days showed a decrease with the addition of phosphate sludges. The specific surface areas of Cal-PS1 geopolymers ranged from 16.3 to 16.9 m2/g and from 17.62 to 18.73 m2/g for Cal-PS2 specimens exhibiting a mesoporous structure. The elasticity modulus of the geopolymers was found to increase with the increase of the apparent density of geopolymers and with the sludges content but it tended to be lower than the Portland cement elasticity modulus. Leaching test was conducted to evaluate the potential environmental applications of the geopolymers. This test demonstrated effective containment of heavy metals within the geopolymers’ network, except for low levels of arsenic.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Environmental Science and Pollution Research

ISSN

0944-1344

e-ISSN

1614-7499

Volume of the periodical

31

Issue of the periodical within the volume

32

Country of publishing house

DE - GERMANY

Number of pages

24

Pages from-to

45138-45161

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85197465830