Preparing nano-zinc oxide with high-added-value from waste zinc manganese battery by vacuum evaporation and oxygen-control oxidation
2020
Zhan, Lu | Li, Ouyang | Hsu, Chen-Min
In this paper, nano-ZnO with high-added-value was prepared from waste Zn-Mn battery by using high-temperature vacuum evaporation and oxygen control oxidation. Nano-ZnO particles with different morphologies were prepared under the different experimental conditions of oxygen content, nitrogen flow rate, heating temperature, condensing distance and collecting substrate. The oxygen was used as oxidant and nitrogen was used as carrier gas. Their flow rates were adjusted through a gas mass flowmeter. In the experimental condition of 1123 K heating temperature, 12.5% oxygen content and 21 L/min nitrogen flow rate, the high-added-value tetrapod nano-ZnO in regular shape was obtained on the glass sheet. Its growth process and photoelectric effect were analyzed by electron microscopy and spectrum test. The results showed that the tetrapod nano-ZnO has fantastic UV absorption performance with high purity and can be used as a potential photocatalyst. This research can provide a novel and environmental friendly method for recycling zinc from waste Zn-Mn batteries.
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