Srinivasan Vennila, Sumalatha Vasam, Prasannan Adhimoorthy, Govindarajan Sankar
Department of Polymer Chemistry, University of Madras, Guindy Campus, Chennai 600025, India.
Department of Physics, Indian Institute of Technology-Madras, Chennai 600036, India.
Polymers (Basel). 2022 Jul 17;14(14):2909. doi: 10.3390/polym14142909.
We presented a simple and efficient method for making a polymer-metal nanocomposite using various amounts of cobalt ferrite magnetic nanoparticles (CoFeO MNp) with sulfonated waste polystyrene (SWPS) and utilized for Calcon dye degradation. The MNp was encapsulated with SWPS to avoid agglomeration and maintain its smaller size. ATR-FTIR, Raman spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), dynamic light scattering (DLS), field emission scanning electron microscopy (FESEM), high-resolution transmittance electron microscopy (HR-TEM), atomic force microscopy (AFM) and solid UV were used to analyze the produced polymeric magnetic nanoparticles (SWPS/MNp). As the MNp loading increases, the average particle size decreases. For Calcon dye degradation, SWPS/MNp (20 wt%) was utilized with a smaller average particle size, and the structural changes were detected using a UV-Vis spectrophotometer. As a result, the Calcon dye's characteristic absorbance peak at 515 nm was red-shifted to 536 and 565 nm after 5 min, resulting in a color shift from dark brown to light blue that could be seen with the naked eye. A strong linear correlation was found between the red-shifted absorbance and the concentration of dye solution over the range of 10-100 ppm under optimal conditions. The proposed dye degradation process is simple, efficient, and environmentally friendly and has been successfully used to purify organic azo-dye-containing water.
我们提出了一种简单有效的方法，使用不同量的钴铁氧体磁性纳米颗粒（CoFeO MNp）与磺化废聚苯乙烯（SWPS）制备聚合物-金属纳米复合材料，并将其用于钙黄绿素染料的降解。MNp被SWPS包裹以避免团聚并保持其较小尺寸。使用衰减全反射傅里叶变换红外光谱（ATR-FTIR）、拉曼光谱、X射线衍射（XRD）、热重分析（TGA）、动态光散射（DLS）、场发射扫描电子显微镜（FESEM）、高分辨率透射电子显微镜（HR-TEM）、原子力显微镜（AFM）和固体紫外光谱对制备的聚合物磁性纳米颗粒（SWPS/MNp）进行分析。随着MNp负载量增加，平均粒径减小。对于钙黄绿素染料降解，使用平均粒径较小的SWPS/MNp（20 wt%），并使用紫外可见分光光度计检测结构变化。结果，钙黄绿素染料在515 nm处的特征吸收峰在5分钟后红移至536和565 nm，导致颜色从深棕色肉眼可见地变为浅蓝色。在最佳条件下，在10-100 ppm范围内，红移吸光度与染料溶液浓度之间发现了很强的线性相关性。所提出的染料降解过程简单、高效且环保，已成功用于净化含有机偶氮染料的水。
