Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Ultrason Sonochem. 2018 Mar;41:75-84. doi: 10.1016/j.ultsonch.2017.09.023. Epub 2017 Sep 18.
In this study, novel nanocomposites (NCs) of aromatic polyamide (PA) and surface modified ZnO nanoparticle with s-triazine heterocyclic ring was introduced for efficient removal of toxic hexavalent chromium (VI) from aqueous solution. The surface of ZnO nanoparticle was modified by s-triazine core silane coupling agent (ZnO-TSC) and PA/ZnO-TSC NCs with different amount of ZnO-TSC nanoparticles (0, 5, 10 and 15wt%) were prepared by ultrasonic irradiation. The synthesized PA/ZnO-TSC NCs were characterized by FT-IR, XRD, FE-SEM, TEM and TGA methods. TEM images showed that ZnO nanoparticles were dispersed homogeneously in the polymer matrix. The adsorption experiments were carried out in batch mode to optimize various parameters like contact time, pH and concentration of metal ion that influence the adsorption rate. The maximum uptakes of Cr(VI) at pH 4.0 was 72%, 81%, 89% and 91% for pure PA, NC5%, NC10% and NC15%, respectively. The kinetic of adsorption was investigated and the pseudo second-order model is an appropriate model for interpretation of adsorption mechanism of Cr(VI) ions.
在这项研究中，引入了新型纳米复合材料（NCs），即具有均三嗪杂环的芳香族聚酰胺（PA）和表面改性的 ZnO 纳米粒子，用于从水溶液中有效去除有毒的六价铬（VI）。通过三嗪核心硅烷偶联剂（ZnO-TSC）对 ZnO 纳米粒子的表面进行改性，并通过超声辐照制备了不同量 ZnO-TSC 纳米粒子（0、5、10 和 15wt%）的 PA/ZnO-TSC NCs。通过 FT-IR、XRD、FE-SEM、TEM 和 TGA 方法对合成的 PA/ZnO-TSC NCs 进行了表征。TEM 图像表明，ZnO 纳米粒子均匀分散在聚合物基质中。吸附实验在批处理模式下进行，以优化影响吸附速率的各种参数，如接触时间、pH 和金属离子浓度。在 pH 4.0 时，纯 PA、NC5%、NC10%和 NC15%对 Cr(VI)的最大吸附量分别为 72%、81%、89%和 91%。研究了吸附动力学，准二级模型是解释 Cr(VI)离子吸附机制的合适模型。
