Ag纳米粒子沉积MoS_2多孔复合块材的组装及其吸附性能

Porous Ag Nanoparticle-Deposited MoS_2 Monolith: Preparation and Adsorption Capacity

由于MoS_2纳米片具有许多优异的特性,逐渐受到研究者的重视。以Ag纳米粒子分散液和MoS_2纳米片悬浊液为前驱物,在室温下将其充分混合、搅拌和放置,制得了由Ag连接的MoS_2多孔复合材料(Ag-MoS_2)。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、拉曼光谱及比表面积测试等各种测试技术,对该材料进行了系统表征。结果表明,MoS_2纳米片较容易与Ag纳米粒子相互复合,形成三维多孔无机纳米复合材料。与由MoS_2纳米片所形成的多孔材料相比,该复合材料具有相对更大的比表面积和孔体积,其值分别为18.7 m^2·g^(-1)和0.129 m^3·g^(-1);由于在MoS_2纳米片中加入Ag纳米粒子,其比表面积和孔体积分别增大了34倍和62倍。这种材料由于在孔道内含有大量S原子,因而较易吸附极性有机分子和过渡金属离子。在对罗丹明B和Cu^(2+)离子的吸附测试结果证实,Ag-MoS_2块材的比容量分别为0.755和0.699 g·g^(-1),具有较好的吸附能力。

MoS2 nanoflake（ NF） has being gradually received attention due to its many interesting characteristics. Ag-linked molybdenum disulfide nanocomposite（ Ag-MoS2） was obtained through a process of mixing Ag nanoparticle solution with MoS2 nanoflake suspension at room temperature. Such composite material was characterized by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,transmission electron microscopy（ TEM）,and Raman spectroscopy measurement techniques. The results showed that it was very easy for the Ag nanoparticles to bond with S atoms on the surface of the MoS2. The nanocomposites,Ag-linked MoS2 nanoflakes,form three-dimensional（ 3D） porous structure,which exhibited relatively high specific surface area and pore volume,corresponding to18. 7 m2·g（-1）and 0. 129 cm3·g（-1）,respectively. The values of the specific surface area and pore volume were about 34 and 62 times of MoS2 monolith without Ag nanoparticles. The adsorption measurement results of the Ag-MoS2 monolith demonstrated that such material showed excellent adsorption capacity for Rhodamine B and Cu（2＋）aqueous solution,for which the specific capacities were 0. 755 and 0. 699 g·g（-1）,respectively.