K3[Co(C2O4)3]晶體的制備和環(huán)保改進

頁數 3 字數 2579

摘要 用市場上常用的硫酸鈷代替碳酸鈷，與草酸反應生成草酸鈷，再與草酸鉀在二氧化鉛及冰醋酸的存在下混合即可生成K3[Co(C2O4)3]，用溶劑替換法即可得晶體K3[Co(C2O4)3]·3H2O，再對晶體進行光譜分析，以測定其純度，最后對溶液中鉛進行檢驗，并對濾渣中鉛進行回收。

關鍵詞 硫酸鈷,草酸鈷,二氧化鉛,三草酸合鈷酸鉀,光譜分析,鉻酸鉀,次氯酸,環(huán)保,鉛的回收,溶劑替換法

Abstract The synthesis of K3[Co(C2O4)3] is always referred in the reference books. It always starts with CoCO3 and use PbO2 as a oxidizing agent but Pb2+ will pollute the environment. So, we design a experiment to recycle Pb2+ in order to reduce the pollution. We use CoSO4 instead of CoCO3 to react with H2C2O4 and produce CoC2O4. Then put K2C2O4 onto the deposition and then put PbO2 into the solution slowly. Stir the solution for several minutes and then drop HOAC into the solution slowly. Stir it for an hour and get the K3[Co(C2O4)3] in solution and the deposition on the bottom. Add ethanol into the solution and wait for the crystal of K3[Co(C2O4)3]. Pb2+ only exist in the deposition, so we add ammonia on it and then NaOH. After filtering we get PbO2 as solid. We also can get PbO2 from the liquid filtered after adding NaClO into it. So we recycle Pb2+ successfully with the method that we designed.
Keywords environmental protect; the recycle of Pb2+; filter; solvent exchanging method; UV spectra photometer

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