Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 424, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127119
Keywords
Uranium; Zero valent iron; Phosphate; Reaction sequence; Biochar
Categories
Funding
- National Natural Science Foundation of China [21976042]
- National Key Research and Development Program of China [2019YFC1904101, 2019YFC1904102]
- Project of Guangdong Provincial Key Laboratory of Radioactive Contamination Control and Resources [2017B030314182]
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control [2018B030322014]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011543]
- Science and Technology Planning Project of Guangdong Province, China [2021A0505030076]
- Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2018, 2019)
- University Scientific Research Project of Guangzhou Education Bureau [201831803]
- research project of Guangzhou University [YK2020012]
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The immobilization of uranium from wastewater by zero valent iron was studied in this work. A biochar supported nano zero valent iron was obtained and the uranium immobilization efficiency was enhanced to 99.9% in the presence of phosphate. The sequence of uranium, Fe/BC(900) and phosphate influenced the uranium immobilization efficiency.
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 degrees 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.
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