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首页> 外文期刊>RSC Advances >Synthesis and adsorption behavior of hydroxypropyl-β-cyclodextrin–polyurethane magnetic nanoconjugates for crystal and methyl violet dyes removal from aqueous solutions
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Synthesis and adsorption behavior of hydroxypropyl-β-cyclodextrin–polyurethane magnetic nanoconjugates for crystal and methyl violet dyes removal from aqueous solutions

机译：羟丙基-β-环糊精 - 聚氨酯磁性纳米缀合物的合成及吸附性能与水溶液中除去晶体和甲基紫染料

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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 ~(?1) and 1667 mg g ~(?1) 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.
机译：在该研究中，合成羟丙基-β-环糊精（HPβCD），HPβCD - 缀合的磁性纳米颗粒（HPMN）和HPβCD - 缀合的磁性纳米粒子（HPMNPU），用作去除晶体紫（CV）和甲基的吸附剂紫（MV）从水溶液中染料。通过傅里叶变换红外光谱，X射线衍射和扫描电子显微镜表征磁性纳米复合材料。表征分析结果表明HPβCD用磁性纳米粒子和聚氨酯网络成功修饰。在这项工作中，最初用于研究染料杂质的吸附和消除的新型明确的筛选设计（DSD）。该方法允许研究以大量变量为特征的那些系统所需的实验数量急剧减少。研究了九种定量参数的影响：初始染料浓度，吸附剂剂量，接触时间，温度，pH，离子强度，HMDI / HP比，Mn / HP比和搅拌速度。对DSD模型的分析显示，只有四个变量，即吸附剂剂量，接触时间，初始染料浓度和HMDI / HP比率是统计学意义。与HPMN相比，HPMNPU纳米复合材料显示出更好的吸附性能，用于从水溶液中去除CV和MV。 HPMNPU的最大吸附容量值分别为CV和MV的约1269mg g〜（α1）和1667mg g〜（α1）。该研究表明，HPMNPU吸附剂具有高吸附性能，用于从水中除去CV和MV，并且可能是有效的吸附材料，用于有效去除废水中的阳离子染料。

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