纳米硒化银的生物合成及其对染料的吸附去除

发布时间：2018-09-10 15:23

【摘要】：利用菌株Pantoea sp.IMH实现了硒化银纳米颗粒的生物合成,同时,结合高分辨透射电镜(HRTEM)、能谱成像(EDX-mapping)、X射线粉末衍射(XRD)等多种表征手段对硒化银纳米颗粒进行了表征分析.结果表明,所合成的硒化银纳米颗粒的粒径为10~20 nm,其纳米颗粒的晶面间距为0.225 nm,对应于Ag2Se的(031)晶面.所合成的纳米颗粒的衍射环对应的标准Ag2Se晶面为(013)、(031)和(113)面.XRD结果表明,纳米颗粒的晶面为(111)、(112)和(004)晶面,说明菌株IMH能够合成纳米硒化银晶体.通过以不同电性的染料分子亚甲基蓝(阳性)、日落黄(阴性)、靛蓝(中性)作为目标分子进行吸附去除应用探索,发现硒化银纳米颗粒对阳性和中性染料分子有良好的吸附去除效果.这是由于硒化银纳米颗粒表面带有负电荷(Zeta电位分别为-11.8 m V(p H=5)、-13.0 m V(p H=7)、-13.0 m V(p H=9)).本研究为硒化银纳米颗粒的生物合成提供了新思路,拓展了硒化银纳米颗粒的合成方法.
[Abstract]:The biosynthesis of silver selenide nanoparticles was carried out by using the strain Pantoea sp.IMH. At the same time, the silver selenide nanoparticles were characterized by means of high resolution transmission electron microscopy (EDX-mapping) (HRTEM), energy dispersive spectroscopy (EDX-mapping) X-ray powder diffraction (XRD). The results show that the grain size of the synthesized silver selenide nanoparticles is 10 ~ 20 nm, and the crystal plane spacing of the nanoparticles is 0.225 nm, corresponding to the (031) plane of Ag2Se. The standard Ag2Se crystal faces corresponding to the diffraction rings of the synthesized nanoparticles are (013), (031) and (113) faces. The results show that the crystal faces of the nanoparticles are (111), (112) and (004) planes, indicating that the strain IMH can synthesize silver selenide nanocrystals. By using different electrically active dye molecules methylene blue (positive), sunset yellow (negative) and indigo (neutral) as target molecules for adsorption and removal, It is found that silver selenide nanoparticles have good adsorption and removal effect on positive and neutral dye molecules. This is due to the negative charge on the surface of silver selenide nanoparticles (Zeta potential of -11.8 m V (p Hf5) and -13.0 m V (p Hf7) + -13.0 m V (p Hf-1 9). This study provides a new idea for the biosynthesis of silver selenide nanoparticles and extends the synthetic methods of silver selenide nanoparticles.
【作者单位】：西安建筑科技大学环境与市政工程学院;西安市政设计研究院有限公司;
【基金】：国家自然科学基金(No.51778523) 西部绿色建筑国家重点实验室培育基地开放研究基金项目(No.LSKF201703)~~
【分类号】：O614.122;TB383.1;X788

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