期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 244, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2020.116667
关键词
Uranium-contaminated soil; Electrokinetic; Permeable reactive barrier; Zero-valent iron (ZVI); Activated carbon (AC)
资金
- National Natural Science Foundation of China [51174117]
- Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment
- Hunan Province Engineering Research Center of Radioactive Control Technology in Uranium Mining and Metallurgy
- planning project of Hunan Province in 2017 [XJK17BGD013]
- scientific research project of the Hunan Provincial Education Department [17C0439]
Zero-valent iron/activated carbon (ZVI/AC) particles can promote the reduction of U(VI) by micro-electrolysis. Therefore, they can be used to develop materials for permeable reactive barrier (PRB). In this study, citric acid (CA) mixed with ferric chloride (FeC1 3 ) was selected as composite electrolyte, and we investigated the feasibility of electrokinetic (EK) coupled with Fe/C-PRB on the remediation of red soil artificially contaminated with U(VI). Seven EK experiments were conducted to study the effect of the type, location, and amount of PRB media on the removal of U(VI) in soil by the EK-PRB system. The results showed that the ZVI/AC mixture is superior to the single ZVI or AC as the PRB medium. For the EK-PRB system, a moderate increase in the number of PRBs and decrease in the thickness of the PRB in soil chamber can enhanced the removal of U(VI) from the contaminated soil. Under optimized conditions, after the 120h remediation experiment obtained the maximum removal efficiency (80.58 +/- 0.99%) of U(VI). Scanning electron microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to study the surface properties of the ZVI/AC mixture before and after the reaction. The results demonstrated that the soluble U(VI) was reduced to the insoluble U(IV) in the ZVI/AC mixture, or adsorption of activated carbon or iron corrosion products regardless of the pH distribution. This work provides a green efficient technology for the recovery of U (VI) from contaminated soil, waste slag or solid waste.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据