富氮碳片对亚甲基蓝染料的吸附。
Nitrogen-enriched carbon sheet for Methyl blue dye adsorption.
机构信息
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
出版信息
J Environ Manage. 2018 Jun 1;215:123-131. doi: 10.1016/j.jenvman.2018.03.051. Epub 2018 Mar 19.
In this work, nitrogen-enriched carbon sheet (NECS) was successfully fabricated by using sodium gluconate as a carbon source via melamine assisted chemical blowing approach. The obtained material exhibits sheet-like morphology with ultra-thin thickness and has a high specific surface area of 604 mg and high nitrogen contents of 11.2 wt%. The NECS showed an excellent adsorption performance towards the removal of anionic dye Methyl blue (a-Mb). The adsorption of a-Mb onto NECS better fitted the Langmuir isotherm model with the highest adsorption capacity of 847 mg g. Interestingly, the NECS showed a pH-sensitive behavior towards the adsorption efficiency of a-Mb dye in which the adsorption capacity abruptly increased from 34 to 701 mg g when the pH of the solution was decreased from 10 to 2. Furthermore, the adsorbed materials can be easily regenerated without obvious efficiency loss over a five adsorption-desorption cycles.
在这项工作中，成功地通过三聚氰胺辅助的化学发泡方法，以葡萄糖酸钠作为碳源制备了富氮碳片（NECS）。所得到的材料具有超薄厚度的片状形态，比表面积高达 604 mg，氮含量高达 11.2wt%。NECS 对阴离子染料亚甲基蓝（a-Mb）的去除表现出优异的吸附性能。a-Mb 在 NECS 上的吸附更符合朗缪尔等温吸附模型，最大吸附容量为 847mg·g。有趣的是，NECS 对 a-Mb 染料的吸附效率表现出 pH 敏感性，当溶液的 pH 值从 10 降低到 2 时，吸附容量从 34 迅速增加到 701mg·g。此外，吸附材料可以在五个吸附-解吸循环中不损失明显效率地轻松再生。
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