Phosphate enhanced uranium stable immobilization on biochar supported nano zero valent iron

Yang Ruan; Huimin Zhang; Zijing Yu; Zenghui Diao; Gang Song; Minhua Su; Li'an Hou; Diyun Chen; Shuao Wang; Lingjun Kong

doi:10.1016/j.jhazmat.2021.127119

Phosphate enhanced uranium stable immobilization on biochar supported nano zero valent iron

J Hazard Mater. 2022 Feb 15;424(Pt A):127119. doi: 10.1016/j.jhazmat.2021.127119. Epub 2021 Sep 11.

Authors

Yang Ruan¹, Huimin Zhang¹, Zijing Yu¹, Zenghui Diao², Gang Song¹, Minhua Su¹, Li'an Hou¹, Diyun Chen¹, Shuao Wang³, Lingjun Kong⁴

Affiliations

¹ Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China.
² School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
³ Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; School for Radiological and Interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou 215123, China.
⁴ Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: kongljun@gzhu.edu.cn.

PMID: 34597926
DOI: 10.1016/j.jhazmat.2021.127119

Abstract

Uranium (U) immobilization from wastewater by zero valent iron (ZVI) was widely concerned through reduction and surface adsorption. Releasing of U due to re-oxidation of U(IV) into U(VI) limited the application of ZVI in U decontamination. In this work, a kind of biochar supported nano zero valent iron (Fe/BC(900)) was obtained by carbothermal reduction of starch mixed with ferric nitrate at 900 °C. U immobilization behavior by Fe/BC(900) in the presence of phosphate (P) was investigated. The U immobilization reaction was adjusted by controlling the sequence of U, Fe/BC(900) and P. U immobilization efficiency was enhanced to 99.9% in the presence of P. Reaction sequence of U, Fe/BC(900) and P influenced the U immobilization efficiency, which followed the order of (U-P)+Fe/BC(900)>(U- Fe/BC(900))+P>U+Fe/BC(900)>(P-Fe/BC(900))+U. P and nZVI both contributed to enhancing U immobilization through precipitation of uranyl-P and reductive co-precipitate (U(IV)) in a wide pH range. The released Fe ions could precipitate with uranyl and phosphate. Consumption of P and nZVI in the (P-Fe/BC(900))+U system limited U immobilization ability. The precipitate is highly dependent on U, P and Fe elements. U desorption in (U-P)+Fe/BC(900) system was not observed with stability.

Keywords: Biochar; Phosphate; Reaction sequence; Uranium; Zero valent iron.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Charcoal
Iron / analysis
Phosphates
Uranium*
Water Pollutants, Chemical* / analysis

Substances

Phosphates
Water Pollutants, Chemical
biochar
Charcoal
Uranium
Iron