Abstract A sodium montmorillonite/ureasil-poly(oxyethylene) clay-polymer nanocomposite was prepared using the sol-gel reaction of a U-PEO hybrid precursor/clay mineral suspension, with the aim of developing a sorbent for the removal of cationic dyes from aqueous media. The structural characteristics of the nanocomposite were studied by FTIR, XRD, UV–Vis spectroscopy, and SAXS. The XRD results revealed intercalation of the U-PEO in the silicate interlayer spaces. FTIR spectra indicated the existence of strong interactions between methylene blue (MB) dye and the clay mineral silicate layers. Time-resolved SAXS measurements during MB adsorption showed a decrease of the montmorillonite (Mt) peak area and an increase of the half-height width of the peak, indicating that water uptake during dye adsorption caused a reduction of the Mt. crystallite size. UV–Vis adsorption experiments showed that the kinetics of MB adsorption followed a pseudo-first order process and that the steady state equilibrium adsorption capacity followed the Langmuir model. The results showed that the nanocomposite is potentially applicable as an adsorbent of dyes present in contaminated waters.

中文翻译：

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蒙脱石钠/脲基-聚氧乙烯纳米复合材料作为阳离子染料的潜在吸附剂

摘要 利用 U-PEO 杂化前驱体/粘土矿物悬浮液的溶胶-凝胶反应制备了钠蒙脱石/尿素-聚（氧乙烯）粘土-聚合物纳米复合材料，目的是开发一种吸附剂，用于从水溶液中去除阳离子染料。媒体。通过FTIR、XRD、UV-Vis光谱和SAXS研究了纳米复合材料的结构特征。XRD 结果表明 U-PEO 嵌入硅酸盐层间空间。FTIR 光谱表明亚甲蓝 (MB) 染料和粘土矿物硅酸盐层之间存在强相互作用。MB 吸附过程中的时间分辨 SAXS 测量显示蒙脱石 (Mt) 峰面积减小，峰的半高宽增加，表明染料吸附过程中的吸水导致 Mt 减少。微晶尺寸。UV-Vis吸附实验表明MB吸附动力学遵循准一级过程，稳态平衡吸附容量遵循Langmuir模型。结果表明，纳米复合材料有可能用作污染水中存在的染料的吸附剂。