Elucidating the redox-driven dynamic interactions between arsenic and iron-impregnated biochar in a paddy soil using geochemical and spectroscopic techniques

Xing Yang, Sabry M. Shaheen, Jianxu Wang, Deyi Hou, Yong Sik Ok, Shan Li Wang, Hailong Wang, Jörg Rinklebe

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

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 μg L-1) under reducing conditions and immobilized (61.6–71.1 μg 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.

Original languageEnglish
Article number126808
JournalJournal of hazardous materials
Volume422
DOIs
Publication statusPublished - 2022 Jan 15

Bibliographical note

Funding Information:
This work was supported by the National Key Research and Development Program of China ( 2020YFC1807704 ), the National Natural Science Foundation of China (Grant No. 21876027 ), and the Fundamental Research Program of Department of Science and Technology of Guizhou, China ( ZK[2021]-key-045 ), and the Special Fund for the Science and Technology Innovation Team of Foshan, China (Grant No. 1920001000083 ). Authors are also grateful to the team in NSRRC, Hsinchu 30076, Taiwan, ROC, and in particular Dr. Soo, Yun-Liang (TLS 07A1) and Dr. Lee, Jyh-Fu (TLS 17C1). We thank the team of the Laboratory of Soil- and Groundwater-Management, University of Wuppertal, Germany, in particular Ilya Mironov, Claus Vandenhirtz and Kail Matuszak for technical assistance.

Funding Information:
This work was supported by the National Key Research and Development Program of China (2020YFC1807704), the National Natural Science Foundation of China (Grant No. 21876027), and the Fundamental Research Program of Department of Science and Technology of Guizhou, China (ZK[2021]-key-045), and the Special Fund for the Science and Technology Innovation Team of Foshan, China (Grant No. 1920001000083). Authors are also grateful to the team in NSRRC, Hsinchu 30076, Taiwan, ROC, and in particular Dr. Soo, Yun-Liang (TLS 07A1) and Dr. Lee, Jyh-Fu (TLS 17C1). We thank the team of the Laboratory of Soil- and Groundwater-Management, University of Wuppertal, Germany, in particular Ilya Mironov, Claus Vandenhirtz and Kail Matuszak for technical assistance.

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

  • Fe-based biochar
  • Immobilization mechanisms
  • Redox conditions
  • Soil remediation
  • Toxic metal(loid)s

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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