Aerogel based on melamine-formaldehyde and alginate: Simply removing of uranium from aqueous solutions
Aerogel based on melamine-formaldehyde and alginate: Simply removing of uranium from aqueous solutions
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基于三聚氰胺甲醛和海藻酸盐的气凝胶：简单地从水溶液中去除铀
DOI：
10.1016/j.molliq.2019.111154
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发表时间：
2019-09
影响因子：
6
通讯作者：
Chen Hong Bing
中科院分区：
文献类型：
--
作者：
He Yan Rong;Li Xin Lei;Li Xiao Long;Tan Zhao Yi;Zhang Dong;Chen Hong Bing
制备了三聚氰胺-甲醛/海藻酸钠（MF-A）气凝胶，并将其用于水溶液中U（VI）的吸附。所制备的材料具有较大的尺寸和多孔网络结构，大大简化了U（VI）吸附的操作过程。采用扫描电镜（SEM）和傅里叶变换红外光谱（FT-IR）对材料进行了表征。通过批实验考察了时间、U（VI）初始浓度、pH值和共存离子对反应的影响。结果表明，随着海藻酸钠比例的增加，U（VI）的去除率明显提高，表明海藻酸钠在U（VI）的吸附中起着重要作用。实验数据符合Langmuir吸附等温式，在pH 4.0时，MF-A气凝胶的最大吸附量为211.22 mg g− 1。吸附性能的材料显着依赖于溶液的pH值：U（VI）去除效率急剧增加，从pH值2.0至5.5，然后下降，pH值高于5.5。本工作展示了一种从水溶液中简单去除U（VI）的聚合物吸附剂，为U（VI）吸附剂的开发提供了一个新的概念。
In the present study, melamine-formaldehyde/alginate (MF-A) aerogel were fabricated for U(VI) adsorption from aqueous solutions. The prepared materials showed a large size and a porous network structure, which greatly simplified the operation procedure of U(VI) adsorption. The materials were characterized with scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) techniques. The influence of time, initial U(VI) concentration, pH, and coexisting ions were detected with batch experiments. The results showed that with the increasing of the proportion of alginate, U(VI) removal efficiency increased apparently, indicating that alginate play an important role in U(VI) adsorption. The experimental data fitted well with Langmuir isotherm model, and according to which, the maximum adsorption capacity of the MF-A aerogel was 211.22 mg g−1at pH 4.0. The adsorption performance of the materials significantly depended on solution pH: U(VI) removal efficiency increased sharply from pH 2.0 to 5.5, and then declined at pH levels above 5.5. This work shows a polymer adsorbent for simply removal from aqueous solution, providing a new concept for development of U(VI) adsorbents.
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