School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China.
Beijing Key Laboratory of Clothing Materials R & D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing, 100029, China.
Environ Sci Pollut Res Int. 2019 Oct;26(28):28860-28870. doi: 10.1007/s11356-019-06069-y. Epub 2019 Aug 5.
Nowadays, most of mineral-based adsorbents are powder form, which makes them inconvenient to collect and always easy to cause secondary pollution. In this work, an organic rectorite composite nanofiber membrane (SRt-PAN) was designed and prepared by electrospinning technique. The as-received composite nanofiber membranes were characterized by XRD and SEM analysis, proving the homodisperse and existence of SRt in PAN nanofiber membrane. A series of batch experiments for BPA adsorption were carried out to investigate the effect of different adsorption parameters, including initial concentration, pH, and temperature of pollutant solution. The influences of modifier dosage and adsorbent dosage on the adsorption performance were investigated as well. On the basis of the experiment results, the adsorption process could be well described by the pseudo-second-order model and the Langmuir isotherm. In addition, the thermodynamic parameters indicate that this adsorption process is exothermic and spontaneous. Moreover, compared with pure nanofiber membranes and organic rectorite powders, the resultant SRt-PAN adsorbents exhibited higher adsorption capacity, superior reusability, and adsorption stability. It is indicated that the hydrophobicity surface of organic rectorite should be the key factor to not only the intimate interfacial combination between the mineral and PAN, but also the enhancement of BPA adsorption capacity.
如今，大多数基于矿物质的吸附剂呈粉末状，这使得它们不方便收集，而且容易造成二次污染。在这项工作中，我们通过静电纺丝技术设计并制备了一种有机累托石复合纳米纤维膜（SRt-PAN）。接收的复合纳米纤维膜通过 XRD 和 SEM 分析进行了表征，证明了 SRt 在 PAN 纳米纤维膜中的均分散性和存在。进行了一系列 BPA 吸附的批实验，以研究不同吸附参数的影响，包括污染物溶液的初始浓度、pH 值和温度。还研究了改性剂用量和吸附剂用量对吸附性能的影响。基于实验结果，吸附过程可以很好地用拟二级模型和 Langmuir 等温线来描述。此外，热力学参数表明，该吸附过程是放热和自发的。此外，与纯纳米纤维膜和有机累托石粉末相比，所得的 SRt-PAN 吸附剂表现出更高的吸附容量、更好的可重复使用性和吸附稳定性。这表明有机累托石的疏水性表面是不仅矿物与 PAN 之间紧密界面结合的关键因素，也是增强 BPA 吸附容量的关键因素。
