花球状银催化材料的制备及其对4-硝基苯酚的催化加氢性能

通过室温下将硝酸银水溶液与含有硫酸亚铁和柠檬酸的水溶液直接混合，一步合成由银纳米片自组装而成的银花状球结构。结合X射线粉末衍射（XRD）、扫描电子显微镜（SEM）等结构表征手段，考察硝酸银水溶液的滴加速度、柠檬酸添加量等因素对产物形貌及尺寸的影响，并对银花状球的形成机理进行研究。实验结果表明，通过对硝酸银水溶液滴加速度的简单调控可以实现银颗粒形貌由薄片状到花球状的转变。此外，该形貌的微纳米材料在4-硝基苯酚加氢反应中呈现出优异的催化活性。

Flower-like Silver Sphere Catalytic Material:Preparation and Catalytic Activity for the Hydrogenation Reduction of p-Nitrophenol

The flower-like silver sphere structure has been rapidly synthesized by self-assembly of silver nanoflakes through one-step direct mixing of silver nitrate aqueous solution and an aqueous solution containing ferrous sulfate and citric acid. The influence of dropping speed of silver nitrate aqueous solution and the dosage of citric acid on the morphology and size of product were investigated in details through different characteristic methods including X-ray diffraction (XRD) and scanning electron microscopy (SEM). Furthermore, the possible formation mechanism of flower-like silver sphere was explored. The obtained experimental results indicated that the morphology of silver particles could transform from thin flake into flower-like sphere by simply adjusting the dropping speed of silver nitrate aqueous solution. Additionally, this type of nanomaterial exhibited superior catalytic activity for the hydrogenation reduction of p-nitrophenol.