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三种多级结构花状硫化铜通过水热法,利用纳米薄片自组装形成.加入有机分子聚乙烯吡咯烷酮或1,3,5-均苯三甲酸调控其片层密度.产物作为基板生长镍纳米颗粒.通过环境扫描电子显微镜(SEM),X射线衍射(XRD),透射电子显微镜(TEM)等对这种复合物的结构进行表征.利用紫外-可见吸收光谱,研究了产物作为催化剂催化还原4-硝基苯酚的性能.结果表明,长在具有最稀疏片层的样品(Ni@SUB2)上的镍纳米颗粒(Ni NPs,直径5 nm左右)具有超低负载量,为0.469%(w).Ni@SUB2在三种Ni@SUB复合物中具有最好的催化性能.还原4-硝基苯酚的反应中,4-硝基酚初始浓度为0.2 mmol L–1时Ni@SUB2在4 min中内转化率可以实现100%,而等量的纯Ni纳米颗粒转化率只有43%.增强的催化性能可以归结为镍纳米颗粒在硫化铜基板上得到良好分散,可以提供更多催化位点.同时硫化铜基板不溶于水,可以通过离心的方式回收催化剂,有利于环境保护.
Three kinds of multi-level structure of flower-like copper sulfide by hydrothermal method, the use of nano-sheet self-assembly formation.Adding organic molecules polyvinylpyrrolidone or 1,3,5-trimesic acid regulation of its lamellar density.The product as a substrate for the growth of nickel nano The structure of this complex was characterized by means of environmental scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), etc. The product was investigated as a catalyst for catalytic reduction 4 using UV-vis absorption spectroscopy - nitrophenol.The results showed that nickel nanoparticles (Ni NPs, about 5 nm in diameter) grown on Ni @ SUB2 with the most sparse lamellae had an extremely low loading of 0.469% (w) .Ni @ SUB2 had the best catalytic performance among the three Ni @ SUB composites.In the reaction of reducing 4-nitrophenol, Ni @ SUB2 was stable at 4 min after the initial concentration of 4-nitrophenol was 0.2 mmol L -1 The mid-range conversion was achieved at 100%, while the equivalent conversion of pure Ni nanoparticles was only 43%. The enhanced catalytic performance can be attributed to the good dispersion of the nickel nanoparticles on the copper sulfide substrate, which provides more catalytic sites. At the same time the copper sulfide substrate insoluble in water, can be recovered by centrifugation catalysis Agent, is conducive to environmental protection.