Hosseini Seyed Abolhassan, Daneshvar E Asl Shervin, Vossoughi Manouchehr, Simchi Abdolreza, Sadrzadeh Mohtada
Department of Mechanical Engineering, 10-367 Donadeo Innovation Center for Engineering, Advanced Water Research Lab (AWRL), University of Alberta, Edmonton, AB, Canada T6G 1H9.
Department of Chemical & Petroleum Engineering, Sharif University of Technology, Tehran, Iran 1458889694.
ACS Omega. 2021 Apr 13;6(16):10816-10827. doi: 10.1021/acsomega.1c00480. eCollection 2021 Apr 27.
Chitosan/poly(vinyl alcohol)/amino-functionalized montmorillonite nanocomposite electrospun membranes with enhanced adsorption capacity and thermomechanical properties were fabricated and utilized for the removal of a model cationic dye (Basic Blue 41). Effects of nanofiller concentrations (up to 3.0 wt %) on the morphology and size of the nanofibers as well as the porosity and thermomechanical properties of the nanocomposite membranes are studied. It is shown that the incorporation of the nanoclay particles with ∼10 nm lateral sizes into the polymer increases the size of the pores by about 80%. To demonstrate the efficiency of the adsorbents, the dye removal rate is investigated as a function of pH, adsorbent dosage, dye concentration, and nanofiller loading. The highest and fastest dye removal occurs for the nanofibrous membranes containing 2 wt % nanofiller, where about 80% of the cationic dye is removed after 15 min. This performance is at least 20% better than the pristine chitosan/poly(vinyl alcohol) membrane. The thermal stability and compression resistance of the nanocomposite membranes are found to be higher than those of the pristine membrane. In addition, reusability studies show that the dye removal performance of this nanocomposite membrane reduces by only about 5% over four cycles. The adsorption kinetics is explained by the Langmuir isotherm model and is expressed by a pseudo-second-order kinetic mechanism that determines a spontaneous chemisorption process. The results of this study provide a valuable perspective on the fabrication of high-performance, reusable, and efficient electrospun fibrous nanocomposite adsorbents.
制备了具有增强吸附能力和热机械性能的壳聚糖/聚乙烯醇/氨基功能化蒙脱石纳米复合电纺膜，并将其用于去除一种模型阳离子染料（碱性蓝41）。研究了纳米填料浓度（高达3.0 wt%）对纳米纤维形态和尺寸以及纳米复合膜孔隙率和热机械性能的影响。结果表明，将横向尺寸约为10 nm的纳米粘土颗粒掺入聚合物中可使孔隙尺寸增加约80%。为了证明吸附剂的效率，研究了染料去除率与pH值、吸附剂用量、染料浓度和纳米填料负载量的关系。对于含有2 wt%纳米填料的纳米纤维膜，染料去除率最高且最快，15分钟后约80%的阳离子染料被去除。该性能比原始壳聚糖/聚乙烯醇膜至少高出20%。发现纳米复合膜的热稳定性和抗压性高于原始膜。此外，可重复使用性研究表明，该纳米复合膜在四个循环中的染料去除性能仅降低约5%。吸附动力学由朗缪尔等温线模型解释，并由伪二级动力学机制表示，该机制确定了一个自发的化学吸附过程。本研究结果为高性能、可重复使用和高效的电纺纤维纳米复合吸附剂的制备提供了有价值的观点。
