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首页> 美国卫生研究院文献>Materials >Silver-Nanoparticles Embedded Pyridine-Cholesterol Xerogels as Highly Efficient Catalysts for 4-nitrophenol Reduction
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Silver-Nanoparticles Embedded Pyridine-Cholesterol Xerogels as Highly Efficient Catalysts for 4-nitrophenol Reduction

机译：银-纳米颗粒嵌入的吡啶-胆固醇干凝胶是4-硝基苯酚还原的高效催化剂

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Two xerogels made of 4-pyridyl cholesterol (PC) and silver-nanocomposites (SNCs) thereof have been studied for their efficient reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of aqueous sodium borohydride. Since silver doping will be effective in ethanol and acetone solvents with a PC gelator, two silver-loaded PC xerogels were prepared and successive SNCs were achieved by using an environmentally benign trisodium citrate dehydrate reducing agent. The formed PC xerogels and their SNCs were comprehensively investigated using different physico-chemical techniques, such as field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), powdered X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-Vis). The FE-SEM results confirm that the shape of xerogel-covered silver nanoparticles (SNPs) are roughly spherical, with an average size in the range of 30–80 nm. Thermal degradation studies were analyzed via the sensitive graphical Broido’s method using a TGA technique. Both SNC-PC (SNC-PC-X1 and SNC-PC-X2) xerogels showed remarkable catalytic performances, with recyclable conversion efficiency of around 82% after the fourth consecutive run. The apparent rate constant (k ) of SNC-PC-X1 and SNC-PC-X2 were found to be 6.120 × 10 sec and 3.758 × 10 sec , respectively, at an ambient temperature.
机译：已经研究了两种由4-吡啶基胆固醇（PC）及其银-纳米复合材料（SNC）制成的干凝胶，它们在存在钠水溶液的情况下能将4-硝基苯酚（4-NP）有效还原为4-氨基苯酚（4-AP）。硼氢化物。由于使用PC胶凝剂将银掺杂在乙醇和丙酮溶剂中有效，因此制备了两种负载银的PC干凝胶，并通过使用环境友好的柠檬酸三钠脱水还原剂获得了连续的SNC。使用不同的物理化学技术对形成的PC干凝胶及其SNC进行了全面研究，例如场发射扫描电子显微镜（FE-SEM），傅立叶变换红外（FTIR）光谱，热重分析（TGA），粉末X射线衍射（ XRD）和紫外可见光谱（UV-Vis）。 FE-SEM结果证实，被干凝胶覆盖的银纳米颗粒（SNP）的形状大致为球形，平均尺寸在30-80 nm范围内。使用TGA技术通过灵敏的图形Broido方法分析了热降解研究。两种SNC-PC（SNC-PC-X1和SNC-PC-X2）干凝胶均显示出出色的催化性能，连续第四次运行后可回收转化效率约为82％。发现在环境温度下，SNC-PC-X1和SNC-PC-X2的表观速率常数（k）分别为6.120×10秒和3.758×10秒。

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