[Stabilizing Effects of Fe-Ce Oxide on Soil As(â
¤) and P].
Huan Jing Ke Xue
; 40(8): 3785-3791, 2019 Aug 08.
Article
em Zh
| MEDLINE
| ID: mdl-31854788
ABSTRACT
The mining and smelting of arsenic-containing metal minerals, and the large-scale use of chemicals and pesticides, has resulted in the widespread pollution of soils in southwestern and southern China. In this study, the stabilizing effect of Fe-Ce oxide (FC) on three representative arsenic-contaminated soils was evaluated. The microscopic adsorption characteristics of FC and As(â
¤) were explored by scanning electron microscopy and energy disperse spectroscopy (SEM-EDS) and X-ray photoelectron spectroscopy (XPS). The results showed that FC can significantly reduce arsenic concentrations by 84.1%-98.3% during the Toxicity Characteristic Leaching Procedure (TCLP), and showed strong pH adaptability in alkaline soil. It efficiently transformed (non-)specifically sorbed arsenic (F1+F2) into hydrous oxides phases of Fe and Al (F3+F4). FC also significantly reduced available P by 47.13%-60.32% in different types of soil. FC can not only release As(â
¤) adsorption sites occupied by P in soils, but also effectively prevents non-point source pollution of the surrounding water. SEM-EDS and XPS analysis detected Fe, Ce, and As on the surface of As(â
¤) adsorption products, and As was mainly adsorbed on the surface of Fe atoms. The results of this study provide a scientific basis for soil arsenic stabilization in China.
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MEDLINE
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Zh
Ano de publicação:
2019
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Article