[Simultaneous Immobilization of Cadmium and Arsenic in Paddy Soils with Novel Fe-Mn Combined Graphene Oxide].
Huan Jing Ke Xue
; 45(2): 1107-1117, 2024 Feb 08.
Article
en Zh
| MEDLINE
| ID: mdl-38471948
ABSTRACT
Novel Fe-Mn combined graphene oxide ï¼GO-FMï¼ material was produced and tested for its efficacy in remediating agricultural soil co-contaminated by Cd and As. In a 60-day soil incubation experimentï¼ the remediation mechanism and immobilization effects of GO and GO-FM at different addition ratios ï¼0.1%ï¼ 0.2%ï¼ and 0.3%ï¼ were investigated in Shangyu and Foshan soilsï¼ which had varying physicochemical properties and contamination degrees. The dynamic changes in pHï¼ DOC concentrationï¼ bioavailable Cd and As contentï¼ and morphology of Cd and As were explored to determine the remediation efficacy of the materials. The results demonstrated that compared with that in the blank controlï¼ GO-FM increased the pH in Shangyu soil but decreased the pH in Foshan soil. After cultureï¼ both GO and GO-FM increased the soil DOC content. GO-FM decreased the soluble Cd concentration by 5.08%-19.19% and the bioavailability of Cd by 36.57%-42.8% in Foshan soilï¼ and the main immobilization mechanism was electrostatic adsorptionï¼ complexationï¼ and hydroxylated metal ion formation. The immobilization ability of GO-FM on Cd was lower than that of Foshan soil due to the influence of electrostatic repulsion in Shangyu acidic soil. Howeverï¼ with the increase in the amount of GO-FMï¼ the trend of increasing the bioavailability of Cd by graphene oxide was inhibited. The addition of 0.2% and 0.3% GO-FM decreased the bioavailability of Cd by 6.45%-13.56% in Shangyu soil. Additionallyï¼ GO-FM decreased the bioavailability of As in Shangyu soil and Foshan soil by 4.34%-9.15% and 0.87%-5.71%ï¼ respectively. This was due to the immobilization mechanism of oxidation of As by manganese oxides and inner surface chelate between As and the surface hydroxyl group of iron oxides. In summaryï¼ the immobilization effect of GO-FM on Cd in Foshan soil was better than that in Shangyu soilï¼ and the immobilization effect of GO-FM on As in Shangyu soil was better than that in Foshan soilï¼ which can provide a theoretical basis and reference for the prevention and control of Cd and As co-contamination in different types of soil.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
Zh
Revista:
Huan Jing Ke Xue
Año:
2024
Tipo del documento:
Article
País de afiliación:
China
Pais de publicación:
China