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美國布魯克海文儀器公司>技術(shù)文章>測量應(yīng)用案例-20220709

技術(shù)文章

測量應(yīng)用案例-20220709

閱讀:138          發(fā)布時間:2022-7-26
 

文獻名:U (VI) sequestration by Al-rich minerals: Mechanism on phase dependence and the influence of natural organic matter

 

 

作者 Zequan LiuabTao OuabMinhua SuabHairong PengabGang SongabLingjun KongabDiyun Chenab

a School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China

b Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China

 

 

摘要:Uranium and uranium-containing pollutants are excessively released into the environment, leading to serious water and soil contamination. Minerals such as alumina are naturally abundant and frequently affect the fate and migration behavior of uranium ions. A thorough understanding of the migration and immobilization behavior of uranium on Al-rich minerals (e.g., α-alumina [α-Al2O3] and γ-alumina [γ-Al2O3)]) is essential for unraveling numerous environmental issues. We performed a systematic comparative analysis of U(VI) retention by α-/γ-alumina. The effects of coexisting ions and natural organic matter were explored. Solution pH contributed critically to the retention of U(VI) by α-/γ-alumina. The adsorption rate of γ-Al2O3 for U(VI) removal was faster than that of α-Al2O3, reaching equilibrium within 15 min with a high removal efficiency of 94.43%. PO43− ions significantly promoted U(VI) adsorption, especially for the case of α-Al2O3. The addition of phosphate resulted in a 15-fold enhancement in adsorption capacity. Humic acid promoted U(VI) removal by γ-Al2O3 under acidic conditions while strong inhibition on both α-Al2O3 and γ-Al2O3 in basic conditions. The removal mechanism of U(VI) by alumina is mainly ascribable to electrostatic interaction and surface complexation from various oxygenated functional groups. The present findings are pivotal to the understanding of uranium migration and immobilization in the environment.

 

關(guān)鍵詞:AdsorptionAluminaCrystal structureHumic acidUranium (VI)

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