Facile synthesis of flake-like dihydrate zinc oxalate particles
来源期刊：International Journal of Minerals Metallurgy and Materials2019年第2期
论文作者：Xing Chen Xin Liu Kai Huang
文章页码：234 - 240
摘 要：Monodispersed dihydrated zinc oxalate（ZnC2O4·2H2O） particles with characteristic morphology were synthesized by aging a mixed solution of zinc nitrate（Zn（NO3）2） and sodium oxalate（Na2C2O4） in the presence of a citrate ligand, with an average flat size of approximately 10–15 μm. The important parameters, including the solution pH values and the concentration of the zinc ions and citrate ligand, were investigated using a series of experiments. It is verified that the citrate ligand significantly affects the morphology of zinc oxalate particles, probably via its multiple roles of chelating, dispersing, and selective absorption. Thermodynamic equilibrium of the distribution of zinc species in an aqueous solution of Zn（Ⅱ）-citrate-oxalate-H2O was estimated to explain the experimental results and to clarify the size and morphological evolution mechanism of the precipitated particles.
Xing Chen1,2，Xin Liu1，Kai Huang1,3
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing3. Beijing Key Lab of Green Recycling and Extraction of Metals, University of Science and Technology Beijing
摘 要：Monodispersed dihydrated zinc oxalate（ZnC2O4·2H2O） particles with characteristic morphology were synthesized by aging a mixed solution of zinc nitrate（Zn（NO3）2） and sodium oxalate（Na2C2O4） in the presence of a citrate ligand, with an average flat size of approximately 10–15 μm. The important parameters, including the solution pH values and the concentration of the zinc ions and citrate ligand, were investigated using a series of experiments. It is verified that the citrate ligand significantly affects the morphology of zinc oxalate particles, probably via its multiple roles of chelating, dispersing, and selective absorption. Thermodynamic equilibrium of the distribution of zinc species in an aqueous solution of Zn（Ⅱ）-citrate-oxalate-H2O was estimated to explain the experimental results and to clarify the size and morphological evolution mechanism of the precipitated particles.
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