Removal of Aqueous Uranyl and Arsenate Mixtures after Reaction with Limestone, PO₄^3-, and Ca².

ABSTRACT: The co-occurrence of uranyl and arsenate in contaminated water caused by natural processes and mining is a concern for impacted communities, including in Native American lands in the U.S. Southwest. We investigated the simultaneous removal of aqueous uranyl and arsenate after the reaction with limestone and precipitated hydroxyapatite (HAp, Ca₁₀(PO₄)₆(OH)₂). In benchtop experiments with an initial pH of 3.0 and initial concentrations of 1 mM U and As, uranyl and arsenate coprecipitated in the presence of 1 g L^-1 limestone. However, related experiments initiated under circumneutral pH conditions showed that uranyl and arsenate remained soluble. Upon addition of 1 mM PO₄^3- and 3 mM Ca²⁺ in solution (initi

SUBMITTER: Meza I 

PROVIDER: S-EPMC10739782 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature