Kwiczak-YİĞİtbaŞi Joanna
Department of Chemistry, Bilkent University, Ankara Turkey.
Turk J Chem. 2020 Dec 16;44(6):1515-1527. doi: 10.3906/kim-2005-53. eCollection 2020.
Due to environmental concerns, increasing attention has been focused on the application and preparation of biobased polymers and their blends. In this study, cellulose, the most spread biopolymer on Earth, was used in the preparation of novel cotton/polypropylene-Au and cotton/polyethylene-Au nanocomposites via a green mechanochemical approach. First, mechanoradicals were generated by ball milling of the cotton and thermoplastics under cryo conditions, and then, these radicals were used in the reduction of Au ions to Au nanoparticles (Au NPs). Nanocomposites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The application of mechanochemistry in obtaining the cotton/thermoplastic blends allowed homogenous and fine blending of the samples and in addition, excluded the usage of toxic solvents. Since Au NPs exhibit a wide range of applications, e.g., in catalysis, cotton/thermoplastic-Au nanocomposites were used to catalyze the reduction reaction of 4-nitrophenol to 4-aminophenol, followed by UV-Vis spectroscopy. Finally, the hydrophobicity of the nanocomposites was alternated by tuning the blend composition. In the prepared nanocomposites, cotton and thermoplastics acted as very good supporting matrices for the Au NPs and provided satisfactory access to the NPs.
由于环境问题，生物基聚合物及其共混物的应用和制备受到了越来越多的关注。在本研究中，地球上分布最广的生物聚合物纤维素被用于通过绿色机械化学方法制备新型棉/聚丙烯-金和棉/聚乙烯-金纳米复合材料。首先，通过在低温条件下对棉和热塑性塑料进行球磨产生机械自由基，然后，这些自由基用于将金离子还原为金纳米颗粒（Au NPs）。通过扫描电子显微镜（SEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）对纳米复合材料进行了表征。机械化学在获得棉/热塑性塑料共混物中的应用使得样品能够均匀且精细地混合，此外，还避免了使用有毒溶剂。由于金纳米颗粒具有广泛的应用，例如在催化方面，棉/热塑性塑料-金纳米复合材料被用于催化4-硝基苯酚还原为4-氨基苯酚的反应，随后通过紫外-可见光谱进行监测。最后，通过调整共混物组成改变了纳米复合材料的疏水性。在所制备的纳米复合材料中，棉和热塑性塑料作为金纳米颗粒的非常好的支撑基质，并为纳米颗粒提供了良好的可达性。
