载体乳化液膜法同步进行亚稳相PbCrO_4纳米粒子的仿生合成与铅铬废水的处理

Biomimetic Synthesis of Metastable PbCrO_4 Nanoparticles by Emulsion Liquid Membrane System with Carrier and Coupled Treatment of Pb(II) and Cr(VI) Wastewaters

采用一种新型的纳米材料仿生合成方法———载体乳化液膜法 ,在煤油 -Span 80 -N73 0 1乳化液膜体系中 ,以电镀废水中常见的Cr(VI)溶液为外相 ,蓄电池、油漆等行业废水常见的Pb(II)溶液为内相 ,通过对生物体内囊泡结构的形态和离子传输功能模拟 ,室温下成功合成了能稳定存在的直径为 5～ 15nm的正交亚稳相PbCrO4纳米粒子 .使用XRD ,TEM对产物结构和形貌进行了表征 .首次通过FT IR和UV vis对所得产物和普通块体材料的光学性质做了比较 .并对乳化液膜体系控制产物晶型和尺寸的机理进行了初步的探讨 .

PbCrO4 nanoparticles of metastable orthorhombic phase with the diameter of 5 similar to 15 nm were first synthesized through a new kind of biomimetic method. This kind of method was based on emulsion liquid membrane system to mimic the vesicle structure and ion-transport function. In this system, membrane phase consisted of kerosene, Span-80 and N7301. Cr(VI) and MOO, which usually existed in plating and accumulator wastewaters, were used as external and internal phase respectively. XRD and TEM were taken to characterize the structure and morphology of, as-product. And the optic properties of as-prepared and bulk PbCrO4 materials were first compared with FT-IR and UV-vis results. The possible mechanism was proposed initially. This method is also promising in the treatment of various industrial wastewaters simultaneously.