新型复合材料LnBDC@AC和CB[6]@AC：从设计到亚甲基蓝或甲基橙的选择性吸附
New Composites LnBDC@AC and CB[6]@AC: From Design toward Selective Adsorption of Methylene Blue or Methyl Orange.
作者信息
Santos Guilherme de C, Barros Amanda L, de Oliveira Carlos A F, da Luz Leonis L, da Silva Fausthon F, Demets Grégoire J-F, Alves Júnior Severino
机构信息
Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
Departamento de Química, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil.
出版信息
PLoS One. 2017 Jan 20;12(1):e0170026. doi: 10.1371/journal.pone.0170026. eCollection 2017.
New porous composites LnBDC@AC (AC = Activated carbon, Ln = Eu and Gd and BDC = 1,4-benzenedicaboxylate) and CB[6]@AC (CB[6] = Cucurbit[6]uril) were obtained using hydrothermal route. The LnBDC and CB[B] are located inside the pore of the carbon materials as was observed in SEM-EDS, XRPD and FT-IR analysis. Porosimetry analysis showed values typically between AC and LnBDC material, with pore size and surface area, respectively, 29,56 Å and 353.98 m2g-1 for LnBDC@AC and 35,53 Å and 353.98 m2g-1 for CB[6]@AC. Both materials showed good absorptive capacity of metil orange (MO) and methylene blue (MB) with selectivity as a function of pH. For acid pH, both materials present selectivity by MB and alkaline pH for MO, with notable performance for CB[6]@AC. Additionally, europium luminescence was used as structural probe to investigate the coordination environment of Eu3+ ions in the EuBDC@AC composite after adsorption experiment.
采用水热法制备了新型多孔复合材料LnBDC@AC（AC = 活性炭，Ln = 铕和钆，BDC = 1,4 - 苯二甲酸）和CB[6]@AC（CB[6] = 葫芦[6]脲）。如扫描电子显微镜 - 能谱（SEM - EDS）、X射线粉末衍射（XRPD）和傅里叶变换红外光谱（FT - IR）分析所示，LnBDC和CB[6]位于碳材料的孔内。孔隙率分析表明，其值通常介于AC和LnBDC材料之间，对于LnBDC@AC，孔径和表面积分别为29.56 Å和353.98 m²/g，对于CB[6]@AC，孔径和表面积分别为35.53 Å和353.98 m²/g。两种材料对甲基橙（MO）和亚甲基蓝（MB）均表现出良好的吸附能力，且吸附选择性与pH有关。在酸性pH条件下，两种材料对MB具有选择性，在碱性pH条件下对MO具有选择性，其中CB[6]@AC表现出显著性能。此外，在吸附实验后，利用铕发光作为结构探针来研究EuBDC@AC复合材料中Eu³⁺离子的配位环境。
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