Nano-Fe3O4-modified biochar promotes the formation of iron plaque and cadmium immobilization in rice root

Jing-Yi Zhang; Hang Zhou; Peng Zeng; Shi-Long Wang; Wen-Jun Yang; Fang Huang; Yang Huo; Shu-Ning Yu; Jiao-Feng Gu; Bo-Han Liao

doi:10.1016/j.chemosphere.2021.130212

Nano-Fe₃O₄-modified biochar promotes the formation of iron plaque and cadmium immobilization in rice root

Chemosphere. 2021 Aug:276:130212. doi: 10.1016/j.chemosphere.2021.130212. Epub 2021 Mar 9.

Authors

Jing-Yi Zhang¹, Hang Zhou², Peng Zeng³, Shi-Long Wang⁴, Wen-Jun Yang⁵, Fang Huang⁶, Yang Huo⁷, Shu-Ning Yu⁸, Jiao-Feng Gu⁹, Bo-Han Liao¹⁰

Affiliations

¹ College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: zjydeyx@sina.com.
² College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China; Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: zhouhang4607@163.com.
³ College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China; Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: zengzengpp@foxmail.com.
⁴ College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: 372018537@qq.com.
⁵ College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: yang646309109@163.com.
⁶ College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: 2910425487@qq.com.
⁷ College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: 2198845348@qq.com.
⁸ College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: 1062659458@qq.com.
⁹ College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China; Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: gujiaofeng@csuft.edu.cn.
¹⁰ College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China; Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: liaobohan@163.com.

PMID: 33740654
DOI: 10.1016/j.chemosphere.2021.130212

Abstract

Rice as a paddy field crops, iron-containing materials application could induce its iron plaque formation, thereby affecting cadmium (Cd) transportation in the rhizosphere and its uptake in root. In this study, a hydroponic experiment was conducted to investigate the effects of three exogenous iron materials, namely nano-Fe₃O₄-modified biochar (BC-Fe), chelated iron (EDTA-Fe), and ferrous sulfate (FeSO₄), on the iron plaque formation on the surface of rice root, and to investigate the effects of formed iron plaque on the absorption, migration, and transportation of Cd and Fe in rice plant. The results showed that yellow-brown and brown iron plaque was formed on surface cells of the Fe-treated rice root, and some black particles were embedded in the iron plaque formed by BC-Fe. The proportion of crystallized iron plaque (31.8%-35.9%) formed by BC-Fe was much higher than that formed by EDTA-Fe and FeSO₄. The Cd concentrations in the crystallized iron plaque formed by BC-Fe were 7.64-13.0 mg·kg^-1, and increased with the increasing of Fe concentrations in the plaque. The Cd translocation factor from root to stem (TF_r-s) and the Cd translocation factor from stem to leaf (TF_s-l) with BC-Fe treatment decreased by 84.7% and 80.0%, respectively. The results demonstrated that application BC-Fe promoted the formation of iron plaque and enhanced the sequestration of Cd and Fe in roots, thus reduced the transportation and accumulation of Cd in aerial rice tissues.

Keywords: Cadmium; Iron plaque; Iron-based biochar; Nano materials; Rice.

MeSH terms

Cadmium / analysis
Charcoal
Iron / analysis
Oryza*
Plant Roots / chemistry
Soil
Soil Pollutants* / analysis

Substances

Soil
Soil Pollutants
biochar
Cadmium
Charcoal
Iron