| Full text | |
| Author(s): |
Soares, Matheus B.
;
Duckworth, Owen W.
;
Styblo, Miroslav
;
Cable, Peter H.
;
Alleoni, Luis R. F.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | JOURNAL OF HAZARDOUS MATERIALS; v. 460, p. 13-pg., 2023-10-15. |
| Abstract | |
Biochar is widely used for water and soil remediation in part because of its local availability and low production cost. However, its effectiveness depends on physicochemical properties related to its feedstock and pyrolysis temperature, as well as the environmental conditions of its use site. Furthermore, biochar is susceptible to natural aging caused by changes in soil or sediment moisture, which can alter its redox properties and interactions with contaminants such as arsenic (As). In this study, we investigated the effect of pyrolysis temperature and biochar application on the release and transformations of As in contaminated sediments subjected to redox fluctuations. Biochar application and pyrolysis temperature played an important role in As species availability, As methylation, and dissolved organic carbon concentration. Furthermore, successive flooding cycles that induced reductive conditions in sediments increased the As content in the solution by up to seven times. In the solid phase, the application of biochar and the flooding cycle altered the spatial distribution and speciation of carbon, iron (Fe) and As. In general, the application of biochar decreased the reduction of Fe(III) and As(V) after the firstcycle of flooding. Our results demonstrate that the flooding cycle plays an important role in the reoxidation of biochar to the point of enhancing the immobilization of As. (AU) | |
| FAPESP's process: | 20/13700-4 - Effect of pyrogenic carbon in arsenic species and their interaction with biogenic iron oxide in a contaminated sediment amended with biochar |
| Grantee: | Matheus Bortolanza Soares |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 19/06897-9 - Biogeochemistry of arsenic and lead in soil remediated with biochar |
| Grantee: | Matheus Bortolanza Soares |
| Support Opportunities: | Scholarships in Brazil - Doctorate |