摘要：
Experiments on the removal and recovery of U(VI) from aqueous solution by tea waste were conducted. The adsorbent was characterized by scanning electron microscope and energy dispersive spectrometer before and after the adsorption treatment. The removal of U(VI) amounts to 86.80 % at optimum pH 6. The adsorption process reaches its equilibrium in 12 h at 308 K, and the kinetic characteristic can be described by the pseudo-second-order kinetic equation. The amount of adsorption increases from 22.92 to 142.21 mg g−1 with the decrease of tea waste dosage from 100 to 10 mg for solution with an initial uranium concentration of 50 mg L−1. Desorption for the four strippants is higher than 80 %. The equilibrium data are more agreeable with Freundlich isotherm than Langmuir isotherm.
作者机构：
[李广悦; 刘希涛; 丁德馨; 王永东; 胡南] Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China;[刘希涛] Jiaojia Gold Mine, Laizhou 264000, Shandong, China
通讯机构：
Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
作者机构：
[王永东; 李广悦; 丁德馨; 胡南; 邓钦文; 周支香] Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China
通讯机构：
Key Discipline Lab. for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
作者机构：
[刘玉龙; 胡南; 王有团; 王清良; 李广悦; 丁德馨; 王永东] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, Hunan 421001, China
通讯机构：
[Ding, D.-X.] K;Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, , Hengyang, Hunan 421001, China
摘要：
The Huayuan River in Hunan Province in China is subject to ongoing mining activity with Mn extraction. In this study, the level and environmental significance of metals (including Mn, Cd, Pb, Cu, Zn, Ni and Fe) concentrations in the surface water and river sediments have been investigated along a 187 km reach of the Huayuan River. Using the X-ray fluorescence (XRF) analysis, we analyzed the characterization of metals in manganese sulphate waste residue (MSWR) deposited along the bank of Huayuan River. The speciation of metals in both sediment and MSWR was established using the BCR-three step sequential extraction procedure. In the water samples, the average concentrations of Mn, Cd and Pb exceeded the acceptable concentrations for drinking water in the WHO Guidelines for drinking water quality, Vol. 1, Recommendations, Geneva (2004) and Chinese (GB 5749-2006) guidelines, respectively. The average concentrations of Mn, Cd, Pb and Zn in the river sediments were found to be considerably higher than the corresponding world average shale values. The percentages of Cd (31.4%), Mn (31.1%), Zn (12.8%) and Pb (8.1%) associated with exchangeable and weak acid fraction in the sediments were higher than other metals. Mn (5.81%), Zn (0.208%), Pb (0.0292%) and Cd (0.0113%) were identified in MSWR by XRF analysis. The percentages of Mn, Cd, Zn and Pb associated with the exchangeable and weak acid soluble fraction in MSWR were 41.9%, 31.1%, 23.8% and 9.8%, respectively. The peak solute and sediment-bound metal concentrations were found at the sites of MSWR deposited along the bank of Huayuan River. The results suggested that MSWR deposited along the bank may have a closely relation with the metal pollution of Huayuan River. The results obtained may be useful to assess both short and long-term environmental impact of the MSWR deposited activities and support decisions for a future remediation of this river.
作者机构：
[丁德馨; 刘玉龙; 李广悦; 胡南; 王永东; 王有团] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China
通讯机构：
Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
作者机构：
[丁德馨; 王有团; 王永东; 刘玉龙; 李广悦] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
通讯机构：
[Ding, D.-X.] K;Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, , Hengyang 421001, China
