水是生命之源,采用沉淀法合成Pd@ZIF-8在催化降解水中有机染料(亚甲基蓝)方面的应用和对环境保护都具有重要的意义。将ZnNO3·6H2O和2-甲基咪唑按一定比例在室温下反应合成ZIF-8,采用硼氢化钠还原将Pd负载在ZIF-8上,得到均匀分散的Pd@ZIF-8。通过场发射扫描电子显微镜(SEM)、场发射透射电子显微镜(TEM)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)等测试手段对Pd@ZIF-8样品的形貌、结构、组成进行了表征。并以亚甲基蓝与硼氢化钠的还原反应为模型,利用紫外-可见分光光度计(UV-Vis)来观察Pd@ZIF-8的催化降解性能。结果表明:采用沉淀法制备的Pd@ZIF-8具有分散均匀、容易大量制备的优点。该催化剂不仅降解效率高,并且能够多次循环利用。
Water is the source of life.The use of precipitation method to synthesize Pd@ZIF-8 is of great significance in the catalytic degradation of organic dyes (methylene blue) in water and environmental protection.ZIF-8 was synthesized by reacting ZnNO3·6H2O and 2-methylimidazole at a certain ratio at room temperature,and Pd was supported on ZIF-8 by sodium borohydride reduction to obtain uniformly dispersed Pd@ZIF-8.The shape of the Pd@ZIF-8 sample was measured by field emission scanning electron microscopy (SEM),field emission transmission electron microscopy (TEM),X-ray diffractometry (XRD),and X-ray photoelectron spectroscopy (XPS).The appearance,structure and composition were characterized.The catalytic degradation performance of Pd@ZIF-8 was observed by UV-visible spectrophotometer (UV-Vis) with the reduction reaction of methylene blue and sodium borohydride as a model.The results shown that Pd@ZIF-8 prepared by the precipitation method had the advantages of uniform dispersion and easy preparation in large quantities.The catalyst not only had high degradation efficiency,but also can be recycled many times.
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