Khalil Khaled D, Riyadh Sayed M, Bashal Ali H, Abolibda Tariq Z, Gomha Sobhi M
Department of Chemistry, Faculty of Science, Taibah University, Al-Madinah Almunawarah, Yanbu 46423, Saudi Arabia.
Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt.
Polymers (Basel). 2023 Sep 19;15(18):3817. doi: 10.3390/polym15183817.
The diverse applications of metal oxide-biopolymer matrix as a nanocomposite heterogenous catalyst have caused many researches to scrutinize the potential of this framework. In this study, a novel hybrid barium oxide-chitosan nanocomposite was synthesized through a facile and cost-effective co-precipitation method by doping barium oxide nanoparticles within the chitosan matrix at a weight percentage of 20 wt.% BaO-chitosan. A thin film of the novel hybrid material was produced by casting the nanocomposite solution in a petri dish. Several instrumental methods, including Fourier-transform infrared (FTIR), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD), were used to analyze and characterize the structure of the BaO-CS nanocomposite. The chemical interaction with barium oxide molecules resulted in a noticeable displacement of the most significant chitosan-specific peaks in the FTIR spectra. When the surface morphology of SEM graphs was analyzed, a dramatic morphological change in the chitosan surface was also discovered; this morphological change can be attributed to the surface adsorption of BaO molecules. Additionally, the patterns of the XRD demonstrated that the crystallinity of the material, chitosan, appears to be enhanced upon interaction with barium oxide molecules with the active sites, OH and NH groups, along the chitosan backbone. The prepared BaO-CS nanocomposite can be used successfully as an effective heterogenous recyclable catalyst for the reaction of ,-(alkane-diyl)bis(2-chloroacetamide) with 2-(arylidinehydrazine)-1-carbothioamide as a novel synthetic approach to prepare 2-hydrazonothiazol-4(5)-ones. This new method provides a number of benefits, including quick and permissive reaction conditions, better reaction yields, and sustainable catalysts for multiple uses.
金属氧化物-生物聚合物基质作为一种纳米复合多相催化剂的多种应用，促使许多研究对该框架的潜力进行审视。在本研究中，通过一种简便且经济高效的共沉淀方法，将氧化钡纳米颗粒以20 wt.% BaO-壳聚糖的重量百分比掺杂到壳聚糖基质中，合成了一种新型的氧化钡-壳聚糖混合纳米复合材料。通过将纳米复合溶液浇铸在培养皿中制备了这种新型混合材料的薄膜。使用了几种仪器方法，包括傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、能量色散光谱（EDS）和X射线衍射（XRD），来分析和表征BaO-CS纳米复合材料的结构。与氧化钡分子的化学相互作用导致FTIR光谱中壳聚糖最显著的特征峰发生了明显位移。在分析SEM图的表面形态时，还发现壳聚糖表面发生了显著的形态变化；这种形态变化可归因于BaO分子的表面吸附。此外，XRD图谱表明，材料壳聚糖与具有活性位点OH和NH基团的氧化钡分子相互作用后，其结晶度似乎有所提高，这些活性位点沿着壳聚糖主链分布。所制备的BaO-CS纳米复合材料可成功用作有效的多相可回收催化剂，用于使,-(烷二基)双(2-氯乙酰胺)与2-(芳基亚肼基)-1-碳硫酰胺反应，这是一种制备2-肼基噻唑-4(5)-酮的新型合成方法。这种新方法具有许多优点，包括快速且宽松的反应条件、更好的反应产率以及可持续的多次使用催化剂。
