Biomolecular Electronics and Nanotechnology Division, Central Scientific Instruments Organization (CSIR-CSIO), Sector 30C, Chandigarh 160030, India.
Environ Sci Technol. 2011 Dec 15;45(24):10551-6. doi: 10.1021/es201744t. Epub 2011 Nov 18.
The recovery of pure ZnO (zinc oxide) nanoparticles from spent Zn-Mn dry alkaline batteries is reported. Spent batteries were dismantled to separate the contained valuable metals of the cell electrodes in the form of black powder. Treatment of this black powder with 5 mol L(-1) HCl produced leach liquor, primarily containing 2.90 g L(-1) Zn and 2.02 g L(-1) Mn. Selective and quantitative liquid-liquid extraction of Zn(II) was then carried out in three counter current steps by using Cyanex 923 (0.10 mol L(-1) in n-hexane). Zn(II) distributed in the organic phase as complex ZnCl(2)·2R (R = Cyanex 923 molecule). The metal loaded organic phase was subjected to combust at 600 °C to yield pure ZnO nanoparticles (40-50 nm). Important characteristics of the synthesized nanoparticles were investigated by field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction spectroscopy (XRD), and atomic force microscopy (AFM).
从废 Zn-Mn 干碱性电池中回收纯 ZnO（氧化锌）纳米粒子。废弃电池被拆开，以黑色粉末的形式将电池电极中含有的有价值金属分离出来。用 5 mol/L HCl 处理这种黑色粉末，得到浸出液，主要含有 2.90 g/L 的 Zn 和 2.02 g/L 的 Mn。然后通过在三个逆流步骤中使用 Cyanex 923（正己烷中 0.10 mol/L）进行 Zn(II)的选择性和定量液-液萃取。Zn(II)作为配合物 ZnCl2·2R（R = Cyanex 923 分子）分布在有机相中。负载金属的有机相在 600°C 下进行燃烧，得到纯 ZnO 纳米粒子（40-50nm）。通过场发射扫描电子显微镜（FESEM）、能谱（EDX）、X 射线衍射光谱（XRD）和原子力显微镜（AFM）研究了合成纳米粒子的重要特性。
