Nasiri Shohreh, Alizadeh Nina
Department of Chemistry, Faculty of Science, University of Guilan P. B. 41335-1914 Rasht Iran
RSC Adv. 2019 Aug 8;9(42):24603-24616. doi: 10.1039/c9ra03335a. eCollection 2019 Aug 2.
In this study, hydroxypropyl-β-cyclodextrin (HPβCD), HPβCD-conjugated magnetic nanoparticles (HPMN) and HPβCD-conjugated magnetic nanoparticles with polyurethane networks (HPMNPU) were synthesized and used as adsorbents for the removal of crystal violet (CV) and methyl violet (MV) dyes from aqueous solutions. Magnetic nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The results of characterization analyses indicated that HPβCD was successfully modified with magnetic nanoparticles and polyurethane networks. In this work, a novel definitive screening design (DSD) was initially used to investigate the adsorption and elimination of dye impurities. This method allows a drastic reduction in the number of experiments needed to investigate those systems characterized by a large number of variables. The effects of nine quantitative parameters were investigated: initial dye concentration, adsorbent dose, contact time, temperature, pH, ionic strength, HMDI/HP ratio, MN/HP ratio, and stirrer speed. Analysis of a DSD model revealed that only four variables, namely, adsorbent dose, contact time, initial dye concentration and HMDI/HP ratio were statistically significant. Compared with HPMN, HPMNPU nanocomposites showed better adsorption performance for the removal of CV and MV from aqueous solutions. The maximum adsorption capacity values of HPMNPU were approximately 1269 mg g and 1667 mg g for CV and MV, respectively. This study showed that HPMNPU adsorbents exhibited high adsorption performance for the removal of CV and MV from water and could be promising adsorbent materials for the efficient removal of cationic dyes from wastewaters.
在本研究中，合成了羟丙基-β-环糊精（HPβCD）、HPβCD共轭磁性纳米颗粒（HPMN）以及具有聚氨酯网络的HPβCD共轭磁性纳米颗粒（HPMNPU），并将其用作吸附剂，用于从水溶液中去除结晶紫（CV）和甲基紫（MV）染料。通过傅里叶变换红外光谱、X射线衍射和扫描电子显微镜对磁性纳米复合材料进行了表征。表征分析结果表明，HPβCD已成功地用磁性纳米颗粒和聚氨酯网络进行了改性。在这项工作中，最初使用了一种新型的确定性筛选设计（DSD）来研究染料杂质的吸附和去除。该方法可大幅减少研究那些具有大量变量的系统所需的实验次数。研究了九个定量参数的影响：初始染料浓度、吸附剂剂量、接触时间、温度、pH值、离子强度、六亚甲基二异氰酸酯/HP比率、MN/HP比率和搅拌器速度。对DSD模型的分析表明，只有四个变量在统计学上具有显著意义，即吸附剂剂量、接触时间、初始染料浓度和六亚甲基二异氰酸酯/HP比率。与HPMN相比，HPMNPU纳米复合材料对从水溶液中去除CV和MV表现出更好的吸附性能。HPMNPU对CV和MV的最大吸附容量值分别约为1269 mg/g和1667 mg/g。本研究表明，HPMNPU吸附剂对从水中去除CV和MV表现出高吸附性能，有望成为从废水中高效去除阳离子染料的吸附材料。
