Mimetite precipitation on Pb-clinoptilolite: an effective approach for arsenate removal from water

• Autorzy: Stępień Ewa , Manecki Maciej , Bajda Tomasz

Identyfikatory

DOI

10.2478/mipo-2025-0006

• Języki publikacji: EN

Abstrakty

EN

This short communication proposes a novel approach to arsenate remediation using in situ precipitation of mimetite [Pb₅(AsO₄)₃Cl], a sparingly soluble mineral phase with an apatite structure. The Pb²⁺ source was provided by a lead-modified zeolite (clinoptilolite) loaded with approximately 70 g Pb/kg. It was reacted with arsenate (50 mg As/L) and chloride (20 mg Cl/L) at initial pH values of 2 and 7. Mimetite crystallized on and in the vicinity of zeolite due to the reaction of Pb(II) desorbed from zeolite with arsenate and chloride ions present in aqueous solution: 5Pb2+ desorbed from zeolite +3AsO3-(4) contamination +Cl-supplied extra =Pb5(As)4)3Cl precipitated. Mimetite formed rapidly resulting in efficient arsenate sequestration. At pH 7, arsenate removal reached 99.88% after 24 hr, with minimal lead release (<0.02 mg/L). These results demonstrate that lead-modified clinoptilolite is a promising material for a coupled sorption–precipitation mechanism which provides an effective strategy for arsenic immobilization in contaminated aqueous systems.

Słowa kluczowe

EN

arsenic; lead apatite; zeolite; water remediation; sorption

• Wydawca: Mineralogical Society of Poland
• Czasopismo: Mineralogia
• Rocznik: 2025
• Tom: Vol. 56, iss. 1
• Strony: 44--51
• Opis fizyczny: Bibliogr. 28 poz., rys., tab., wykr.

Twórcy

autor

Stępień Ewa

• Faculty of Geology, Geophysics and Environmental Protection, AGH University of Krakow, al. Mickiewicza 30, 30-059 Kraków, Poland

• https://orcid.org/0009-0003-9756-0628

autor

Manecki Maciej

• Faculty of Geology, Geophysics and Environmental Protection, AGH University of Krakow, al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Bajda Tomasz

• Faculty of Geology, Geophysics and Environmental Protection, AGH University of Krakow, al. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).