Adsorption and desorption of uranium(VI) onto humic acids derived from uranium-enriched lignites

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Yangyang ZhangXianbo Wang

Abstract

Humic acids (HAs) were extracted and characterized from three kinds of uranium-enriched lignites from Yunnan province, China. Batch experiments were used to study the adsorption and desorption behavior of uranium (VI) onto these HAs and a commercial HA. The results showed that the optimum pH level at which all the HAs adsorbed uranium(VI) ranged from 5 to 8. The high uranium content of the HAs was released into the solution at the pH values between 1 and 3; when the HA dosage was 2.5 g L-1, the maximum concentration of uranium was 44.14 μg L-1. This shows that HAs derived from uranium-enriched lignites may present a potential environmental risk when used in acidic conditions. The experimental data were found to comply with the pseudo-second-order kinetic model, and the adsorption isotherms fit the Langmuir and Freundlich models well. The desorption experiments revealed that the sorption mechanism was controlled by the complex interactions between the organic ligands of the HAs and uranium(VI). The uranium present in the HAs may not affect the adsorption capacity of the uranium(VI), but the carboxylic and phenolic hydroxyl groups in the HAs play a significant role in controlling the adsorption capacity.

References

May 16, 2009·Colloids and Surfaces. B, Biointerfaces·Yue QinyanGao Baoyu
Feb 13, 2010·Journal of Hazardous Materials·Ying LiBaoyu Gao
Apr 19, 2015·Journal of Environmental Radioactivity·Fawwaz Khalili, Ghadeer Al-Banna
Mar 22, 2016·Environmental Science & Technology·Yubing SunXiangke Wang
Jul 1, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Xiaoyu WangXia Lu

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Citations

Jul 19, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Dan LiuChunrong Wang
May 18, 2019·Environmental Science and Pollution Research International·Zhi TangYe Tang

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