纳米PbZrO_3/GO复合材料的制备及其对RDX的催化分解

Preparation of PbZrO_3/GO Nanocomposite and Its Catalytic Decomposition on RDX

采用自组装法将纳米PbZrO_3和氧化石墨烯(GO)复合,制备了PbZrO_3/GO纳米复合材料;通过X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、拉曼光谱(Raman)等对其结构进行表征分析;采用差示扫描量热法(DSC)比较并分析了PbZrO_3/GO、PbZrO_3和GO对RDX的催化分解性能。结果表明,通过调整前驱体溶液的pH值,改变纳米颗粒的表面电荷,成功将纳米PbZrO_3(40nm)颗粒紧密负载于GO薄片上;GO的引入有效抑制了PbZrO_3纳米颗粒团聚,比表面积增加了13.73m^2/g;与RDX相比,PbZrO_3/GO、PbZrO_3和GO分别使RDX的热分解峰温降低24.35、14.43和16.57℃;PbZrO_3/GO使RDX热分解过程的表观活化能降低24.4kJ/mol;PbZrO_3/GO复合材料对RDX的催化性能显著优于单一组分的PbZrO_3和GO。

PbZrO3/GO nanocomposite was prepared by a self assemble method, through compounding of nano PbZrOs and graphene oxide （GO）. The structure of PbZrOs/GO nahocomposite was characterized and analyzed by X ray diffraction （XRD）, scanning electron microscope （SEM）, transmission electron microscope （TEM） and Raman spectroscopy （Ra man）. The catalytic decomposition properties of PbZrOs/GO, naho PbZrOs and GO on RDX were compared and analyzed by differential scanning calorimetry （DSC）. The results show that PbZrOs nanoparticles are successfully and closely loaded on the sheets of GO by adjustiug the pH value of the precursor solution and chaining the surface charges of nanoparticles. The introduction of GO effectively inhibits the conglomeration of PbZrOs nanoparticles, and increases the specific surface ar ea of PbZrOs/GO by 13.73m2/g. Compared with RDX, PbZrOs/GO, PbZrOs and GO make the peak temperatures of de composition for RDX decrease 24.35, 14.43 and 16.57℃, respectively. PbZrO3/GO makes the apparent activation energy of decomposition process for RDX reduce by 24.4 kJ/mol. PbZr0s/GO nahocomposite presents better catalytic decomposi tion performance on RDX than single nano PbZrO3 and GO.