Synthesis of Coal-Fly-Ash-Based Ordered Mesoporous Materials and Their Adsorption Application.
Synthesis of Coal-Fly-Ash-Based Ordered Mesoporous Materials and Their Adsorption Application.
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DOI：
10.3390/ma16072868
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发表时间：
2023-04-04
期刊：
影响因子：
--
通讯作者：
Wang J
中科院分区：
文献类型：
--
作者：
Tan M;Pan D;Chen S;Yan X;Han L;Li R;Wang J
以粉煤灰（CFA）为原料合成了有序介孔SBA-15型材料。在所提出的方法中，CFA是，首先，通过添加NaOH的亚临界水活化，这允许在接近室温的强酸性条件下从CFA中有效提取硅物种。随后，在合成体系中，以硅萃取液为硅前驱体，引入无水乙醇作为共溶剂，有效抑制了硅醇物种的聚合，并通过增强氢键相互作用促进了它们与表面活性剂分子的协同自组装。所得SBA-15材料具有高纯度、高比表面积（1014 m2/g）和高孔容（1.08 cm 3/g）以及高度有序的介孔结构，因此，对模拟废水中的亚甲基蓝（MB）表现出优异的去除效率（90.5%）和吸附容量（160.8 mg/g）。此外，从铝原子的均匀掺入到SBA-15的介孔壁的表面酸位点的产生结合的有序介孔结构的完美保留赋予所获得的Al-SBA-15材料与MB的去除性能的进一步提高。MB的去除率可达100%，沿着，最大吸附量为190.1 mg/g。
A feasible approach was developed for the synthesis of ordered mesoporous SBA-15-type materials using coal fly ash (CFA) as raw material. In the proposed approach, CFA was, firstly, activated by subcritical water with the addition of NaOH, which allowed an efficient extraction of silicon species from CFA under strong acidic conditions at near room temperature. Subsequently, in the synthesis system, using silicon extraction solution as the silicon precursor, the introduction of anhydrous ethanol as a co-solvent effectively inhibited the polymerization of silanol species and promoted their collaborative self-assembly with surfactant molecules by enhancing the hydrogen bond interactions. The resultant SBA-15 material had a high purity, high specific surface area (1014 m2/g) and pore volume (1.08 cm3/g), and a highly ordered mesostructure, and, therefore, exhibited an excellent removal efficiency (90.5%) and adsorption capacity (160.8 mg/g) for methylene blue (MB) from simulated wastewater. Additionally, the generation of surface acid sites from the homogenous incorporation of Al atoms onto the mesoporous walls of SBA-15 combined with the perfect retention of the ordered mesostructure endowed the obtained Al-SBA-15 material with a further boost in the removal performance of MB. The MB removal efficiency can reach ~100%, along with a maximum adsorption capacity of 190.1 mg/g.
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影响因子：
5.2
作者：
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通讯作者：
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影响因子：
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作者：
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作者：
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DOI：
10.1007/s10904-020-01565-y
发表时间：
2020-05-05
影响因子：
4
作者：
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通讯作者：
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