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Deep eutectic solvent‐assisted synthesis of highly efficient nanocatalyst (n‐TiO2@TDI@DES (ZnCl2:urea)) for chemoselective oxidation of sulfides to sulfoxides
Applied Organometallic Chemistry ( IF 3.7 ) Pub Date : 2020-12-17 , DOI: 10.1002/aoc.6127
Shaghayegh Taghavi 1 , Ali Amoozadeh 1 , Firouzeh Nemati 1
Affiliation  

This study proposed a straightforward process to synthesize 2,4‐toluene diisocyanate (TDI)‐functionalized TiO2 nanoparticles in which a cost‐effective linker (TDI) with high reactivity was employed to couple nano‐TiO2 through covalent bonding to a deep eutectic solvent (DES). By this method, DES was successfully immobilized on the TiO2@TDI surface as an adsorbent and stabilizer. The structural, morphological, and physicochemical characteristics of the synthesized nanocatalysts were evaluated using various analytical methods including Fourier transform infrared (FT‐IR) spectroscopy, X‐ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy equipped with energy‐dispersive X‐ray spectroscopy (SEM–EDX), and elemental analysis. The heterogeneity of the catalyst was also examined by a hot filtration test. The obtained TiO2@TDI@DES nanoparticles offered superior catalytic behavior and excellent yield as well as recyclability for the chemoselective oxidation of sulfide into sulfoxide using a green oxidant (hydrogen peroxide). This catalyst exhibited excellent reusability as it can be recovered for six successive cycles with no significant leach or reduction of catalytic efficiency.

中文翻译:

深度共晶溶剂辅助合成的高效纳米催化剂(n-TiO2 @ TDI @ DES(ZnCl2:脲)),用于将硫化物化学选择性氧化为亚砜

这项研究提出了一种简单的方法来合成2,4-甲苯二异氰酸酯(TDI)功能化的TiO 2纳米粒子,其中采用了具有成本效益的,具有高反应活性的连接剂(TDI),通过共价键合到深共晶的方式将纳米TiO 2偶联。溶剂(DES)。通过该方法,将DES成功固定在TiO 2上@TDI表面作为吸附剂和稳定剂。使用多种分析方法对合成的纳米催化剂的结构,形态和物理化学特性进行了评估,包括傅立叶变换红外(FT-IR)光谱,X射线衍射(XRD),热重分析(TGA),配备了能量分析仪的扫描电子显微镜色散X射线光谱(SEM-EDX)和元素分析。还通过热过滤测试检查了催化剂的非均质性。所得的TiO 2@ TDI @ DES纳米粒子提供了优异的催化性能和优异的产率,以及使用绿色氧化剂(过氧化氢)将硫化物化学选择性氧化为亚砜的可回收性。该催化剂表现出极好的可重复使用性,因为它可以连续六个循环进行回收,而不会显着浸出或降低催化效率。
更新日期:2021-02-23
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