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首页> 外文期刊>New Journal of Chemistry >Ionothermal synthesis of magnetically-retrievable mesoporous carbons from alkyne-appended ionic liquids and demonstration of their use in selective dye removal
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Ionothermal synthesis of magnetically-retrievable mesoporous carbons from alkyne-appended ionic liquids and demonstration of their use in selective dye removal

机译：来自炔烃的离子液体磁性可检索的介孔碳的离子合成及其在选择性染料中使用的示范

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摘要

We have devised a simple, convenient, and template-free synthetic strategy to make inherently functional (magnetically-responsive) mesoporous carbons by single-step ionothermal cyclotrimerization of alkyne-functionalized ionic liquids (AFILs) comprising paramagnetic anions. During the carbonization process, bromotrichloroferrate(III) [FeBrCl3](-) or tetrabromoferrate(III) [FeBr4](-) anions act as catalysts in controlling the textural properties of carbon, whereas the cation acts as a carbon source. The resulting mesoporous carbons were probed using a host of tools, including X-ray diffraction, thermogravimetric analysis, nitrogen porosimetry (BET analysis), and transmission electron microscopy. Depending on the nature of the parent anion, magnetically-responsive mesoporous carbons (Fe-AFILs@C) with specific surface areas as high as 544 m(2) g(-1) and good structural stability were obtained from the ionothermal synthesis. The current AFILs are shown to be viable precursors to mesoporous carbons with interesting potential applications. For instance, we demonstrate the sorption of the cationic dye methylene blue (MB) and the anionic dye thiazine red R (TRR) from a contaminated aqueous stream using Fe-AFILs@C as well as their subsequent degradation via Fenton chemistry. The detailed sorption kinetics and the isotherm model for the equilibrium process were investigated and are in accordance with pseudo-second-order kinetics for a Langmuir-type adsorption isotherm. Interestingly, the mesoporous carbons were also successfully applied as selective sorbents to separate a binary mixture of the MB and TRR dyes. Significantly, the Fe-AFILs@C can be easily separated from the aqueous solution following the sorption process and can be easily regenerated using a simple ethanol washing step which releases the dye.
机译：我们设计了一种简单，方便和无模板的合成策略，通过包括顺磁阴离子的炔烃官能化离子液体（AFIL）的单步离子热循环化进行固有的功能（磁响应）中孔碳。在碳化过程中，溴二氯甲酸酯（III）[FeBrCl3]（ - ）或四溴铁（III）[FeBr4]（ - ）阴离子作为控制碳的纹理性质的催化剂，而阳离子充当碳源。使用诸如X射线衍射，热重分析，氮孔隙瘤（BET分析）和透射电子显微镜探测所得的中孔碳。取决于父母阴离子的性质，从离子热合成中获得磁性响应性源碳（Fe-afile @ c），具有高达544m（2）g（-1）和良好的结构稳定性。目前的AFIL被证明是具有有趣潜在应用的中孔碳的活性前体。例如，我们证明了使用Fe-afile @ C的阳离子染料亚甲基蓝（Mb）和阴离子染料噻嗪红色R（Trr）的吸附以及通过Fenton化学的后续降解。研究了详细的吸附动力学和平衡过程的等温模型，并根据典型的朗米尔型吸附等温线伪二阶动力学。有趣的是，中孔碳也被成功地应用于选择性吸附剂以分离MB和TRR染料的二元混合物。值得注意的是，Fe-afiles @ C可以通过吸附过程之后的水溶液容易地分离，并且可以使用释放染料的简单乙醇洗涤步骤易于再生。

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