粉煤灰
吸附
铀
萃取(化学)
化学吸附
多孔性
煤
解吸
化学工程
朗缪尔
朗缪尔吸附模型
化学
废水
核化学
材料科学
废物管理
色谱法
冶金
有机化学
工程类
作者
Qichen Li,Tao Xiong,Jun Liao,Yong Zhang
标识
DOI:10.1016/j.scitotenv.2022.156365
摘要
In order to explore a suitable uranium adsorbent with the advantages of low-cost, recyclability and high efficiency, porous coal fly ash aerogels with different size of coal fly ash were synthesized. Among them, PCFAA-1250 (prepared with 1250 mesh coal fly ash (CFA)) showed better adsorption performance and the maximum adsorption efficiency even approached 96.5% (C0 = 10 mg L−1, m/V = 1.0 g L−1, T = 298 K, t = 24 h and pH = 3.0), which was higher than most of previous adsorbents. Langmuir and pseudo-second-order models were more likely to be used to determine the removal behavior of uranium on PCFAA, illustrating that the adsorption reaction was uniform chemisorption. Meanwhile, the adsorption process on PCFAA was spontaneous. Notably, the desorption efficiencies of all of PCFAA were more than 80% after five cycles, which suggested that PCFAA possessed good recyclability, especially PCFAA-1250. Besides, the adsorption mechanism was further revealed via XPS and the uranium ions were immobilized on the surface of adsorbents through complexation. Based on above conclusions, it could be concluded that PCFAA-1250 had the potential to be a candidate for the extraction of uranium from wastewater.
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