Elucidating the redox-driven dynamic interactions between arsenic and iron-impregnated biochar in a paddy soil using geochemical and spectroscopic techniques
- Authors
- Yang, Xing; Shaheen, Sabry M.; Wang, Jianxu; Hou, Deyi; Ok, Yong Sik; Wang, Shan-Li; Wang, Hailong; Rinklebe, Joerg
- Issue Date
- 15-Jan-2022
- Publisher
- ELSEVIER
- Keywords
- Toxic metal(loid)s; Fe-based biochar; Redox conditions; Soil remediation; Immobilization mechanisms
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.422
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 422
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/137527
- DOI
- 10.1016/j.jhazmat.2021.126808
- ISSN
- 0304-3894
- Abstract
- Iron (Fe)-modified biochar, a renewable amendment that synthetizes the functions of biochar and Fe materials, demonstrates a potential to remediate arsenic (As)-contaminated soils. However, the effectiveness of Fe-based biochar to immobilize As in paddy soils under varying redox conditions (Eh) has not been quantified. We tested the capability of the raw (RBC) and Fe-impregnated (FeBC) biochars to immobilize As in a paddy soil under various Eh conditions (from -400 to +300 mV) using a biogeochemical microcosm system. In the control, As was mobilized (686.2-1535.8 mu g L-1) under reducing conditions and immobilized (61.6-71.1 mu g L-1) under oxidizing conditions. Application of FeBC immobilized As at Eh < 0 mV by 32.6%-81.1%, compared to the control, because of the transformation of As-bound Fe (hydro)oxides (e.g., ferrihydrite) and the formation of complexes (e.g., ternary As-Fe-DOC). Application of RBC immobilized As at Eh -100 mV by 16.0%-41.3%, compared to the control, due to its porous structure and oxygen-containing functional groups. Mobilized As at Eh +200 mV was caused by the increase of pH after RBC application. Amendment of the Fe-modified biochar can be a suitable approach for alleviating the environmental risk of As under reducing conditions in paddy soils.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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