Zhou Ling, Slaný Michal, Bai Bingbing, Du Weichao, Qu Chengtun, Zhang Jie, Tang Ying
Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields, College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, China.
Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovakia.
Nanomaterials (Basel). 2021 Mar 28;11(4):861. doi: 10.3390/nano11040861.
In this study, hierarchical MgAl-LDH (layered double hydroxide) nanoparticles with a flower-like morphology were prepared under a hydrothermal condition by employing worm-like micelles formed by cetyltrimethylammonium bromide (CTAB) and salicylic acid (SA) as templates. The morphology and structure of the materials were characterized by Brunauer-Emmett-Teller (BET), SEM, and XRD analyses. The performance for the adsorption of sulfonated lignite (SL) was also investigated in detail. FTIR was used to detect the presence of active functional groups and determine whether they play important roles in adsorption. The results showed that the hierarchical MgAl-LDH nanoparticles with a specific surface area of 126.31 m/g possessed a flower-like morphology and meso-macroporous structures. The adsorption capacity was high-its value was 1014.20 mg/g at a temperature of 298 K and an initial pH = 7, which was higher than traditional MgAl-LDH (86 mg/g). The adsorption process of sulfonated lignite followed the pseudo-second-order kinetics model and conformed to Freundlich isotherm model with a spontaneous exothermic nature. In addition, the hierarchical MgAl-LDH could be regenerated and used, and the adsorption was high after three adsorption cycles. The main adsorption mechanisms were electrostatic attraction and ion exchange between the hierarchical MgAl-LDH and sulfonated lignite.
在本研究中，以十六烷基三甲基溴化铵（CTAB）和水杨酸（SA）形成的蠕虫状胶束为模板，在水热条件下制备了具有花状形貌的分级MgAl-LDH（层状双氢氧化物）纳米颗粒。通过Brunauer-Emmett-Teller（BET）、扫描电子显微镜（SEM）和X射线衍射（XRD）分析对材料的形貌和结构进行了表征。还详细研究了其对磺化褐煤（SL）的吸附性能。利用傅里叶变换红外光谱（FTIR）检测活性官能团的存在，并确定它们在吸附过程中是否起重要作用。结果表明，比表面积为126.31 m²/g的分级MgAl-LDH纳米颗粒具有花状形貌和介孔-大孔结构。其吸附容量较高——在298 K温度和初始pH = 7时，吸附量为1014.20 mg/g，高于传统MgAl-LDH（86 mg/g）。磺化褐煤的吸附过程遵循准二级动力学模型，符合具有自发放热性质的Freundlich等温线模型。此外，分级MgAl-LDH可以再生并重复使用，经过三次吸附循环后吸附量仍较高。主要吸附机制是分级MgAl-LDH与磺化褐煤之间的静电吸引和离子交换。
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