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John, M.; Heuss-Aßbichler, S.; Ullrich, A. (2016): Recovery of Zn from wastewater of zinc plating industry by precipitation of doped ZnO nanoparticles. In: International Journal of Environmental Science and Technology, Vol. 13, No. 9: pp. 2127-2134
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In this study, a facile precipitation process to treat wastewater from zinc plating industry is presented. Water purification rates of Zn range between 96.40 % and 99.99 % depending on the reaction conditions. Optimal results are gained at a low pH value of 9, low temperature of 40 A degrees C and a fast alkalization using NaOH solution containing 16 % pure NaOH. Traces of Ni, Fe, Zn, Cu and Cr present in the wastewater were almost completely removed. The precipitates were analysed by X-ray diffraction, infrared and Raman spectroscopy, electron microscopy and magnetic measurements. They consist of doped ZnO as a main phase. Although ZnO exclusively crystallizes in nanoparticle size, the morphology is directly influenced by the experimental parameters. Additionally, very small amounts of ZnCO3 and Zn(OH)(2) were detected. Magnetic investigations indicate the incorporation of Ni and Fe into the ZnO lattice. The measured saturation magnetization is similar to 0.01 emu/g and the Curie temperature is similar to 75 A degrees C.