Activated carbon as a strong DOM adsorbent mitigates antimony and arsenic release in flooded mining-impacted soils.
J Hazard Mater
; 473: 134663, 2024 Jul 15.
Article
en En
| MEDLINE
| ID: mdl-38788575
ABSTRACT
In Southern China, the co-occurrence of arsenic (As) and antimony (Sb) contamination in soils around Sb mines presents an environmental challenge. During the flooding period of mining-impacted soils, anaerobic reduction of iron (Fe) oxides enhances the mobilization and bioavailability of Sb and As, further elevating the risk of Sb and As entering the food chain. To address this problem, activated carbon (AC) and biochar (BC) were applied to remediate flooded mining-impacted soils. Our results explored that AC can significantly decrease mobilization by 9-97 % for Sb and 9-67 % for As through inhibiting Fe(III) mineral reduction and dissolution in flooded soils. In contrast, there was no significant effect of BC. This was attributed to the strong adsorption of soil dissolved organic matter (DOM) by AC compared to BC, while DOM as electron shuttle is crucial for microbial Fe(III) reduction. Consequently, the DOM sequestration by AC effectively mitigates Sb and As leaching in contaminated mining soils.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Arsénico
/
Contaminantes del Suelo
/
Carbón Orgánico
/
Minería
/
Antimonio
Idioma:
En
Revista:
J Hazard Mater
Asunto de la revista:
SAUDE AMBIENTAL
Año:
2024
Tipo del documento:
Article
País de afiliación:
China