This paper highlights the efficient adsorption of Cr (VI) from wastewater using polyacrylonitrile (PAN)/montmorillonite (Mt) and polyacrylonitrile/zinc oxide nanoparticle-modified montmorillonite (ZnO-Mt) nanofibrous nanocomposites as adsorbents. Mt was modified using zinc oxide nanoparticles (ZnO) by an adsorption process. The particle size of ZnO-Mt was found to be 18 ± 2 nm. Field-emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM) images showed the presence of ZnO on and within the layers of Mt. Mt and ZnO-Mt were used to prepare PAN/clay nanofibrous nanocomposites which were further used as adsorbents for Cr (VI) ions. X-ray diffraction (XRD) analysis showed that Mt and ZnO-Mt were exfoliated in the PAN nanofibrous matrix. Mt, ZnO-Mt, PAN/Mt and PAN/ZnO-Mt nanofibrous nanocomposites were analyzed as adsorbents for the adsorption of Cr (VI) ions. The effect of pH, concentration, time and amount of adsorbent on the removal of Cr (VI) ions from water were investigated. Adsorption of Cr (VI) ions over the adsorbents follows pseudo-second-order kinetics, and Langmuir and Freundlich isotherms. PAN/ZnO-Mt and PAN/Mt nanofibrous nanocomposites were found to be more effective adsorbents for Cr (VI) ions compared to ZnO-Mt and Mt.

本文着重介绍了使用聚丙烯腈（PAN）/蒙脱土（Mt）和聚丙烯腈/氧化锌纳米粒子改性的蒙脱土（ZnO-Mt）纳米纤维纳米复合材料作为吸附剂可有效吸附废水中的六价铬。使用氧化锌纳米颗粒（ZnO）通过吸附工艺对Mt进行了改性。发现ZnO-Mt的粒度为18±2nm。场发射扫描电子显微镜（FESEM）和高分辨率透射电子显微镜（HRTEM）图像显示ZnO在Mt层上及其内部存在。Mt和ZnO-Mt用于制备PAN /粘土纳米纤维纳米复合材料，并进一步用作Cr（VI）离子的吸附剂。X射线衍射（XRD）分析表明，PAN纳米纤维基质中的Mt和ZnO-Mt脱落。Mt，ZnO-Mt，分析了PAN / Mt和PAN / ZnO-Mt纳米纤维纳米复合材料作为吸附Cr（VI）离子的吸附剂。研究了pH，浓度，时间和吸附剂的量对水中Cr（VI）离子去除的影响。Cr（VI）离子在吸附剂上的吸附遵循伪二级动力学，以及Langmuir和Freundlich等温线。与ZnO-Mt和Mt相比，发现PAN / ZnO-Mt和PAN / Mt纳米纤维纳米复合材料对Cr（VI）离子更有效。