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研究了Sb~(3+)-OH~--Cl~-体系中配位溶解-沉淀平衡的理论模拟和实验验证,包括Sb OCl、Sb_4O_5Cl_2和Sb_2O_3的水解沉淀过程。对不同配体浓度、不同p H值条件下的锑离子平衡浓度进行理论计算及实验验证,同时分别从溶解平衡和物质转变吉布斯自由能的角度对沉淀产物进行理论分析,并开展验证实验。结果表明,实际锑离子平衡浓度大于理论计算的浓度,其中理论计算的锑离子最小平衡浓度在p H值4.6时为10~(-10.92)mol/L,而实验验证结果表明在p H值5.1时最小平衡浓度为10~(-3.8)mol/L。在一定p H值条件下可以得到不同沉淀产物,无论是在理论计算或是验证实验中均不存在Sb OCl,验证实验中得到了产物Sb_8O_(11)Cl_2·H_2O。
The theoretical simulation and experimental verification of coordination dissolution - precipitation equilibrium in Sb ~ (3 +) - OH ~ --Cl ~ - system were studied, including the hydrolysis and precipitation of Sb OCl, Sb_4O_5Cl_2 and Sb_2O_3. The equilibrium concentration of antimony ion at different ligand concentrations and different p H values was theoretically calculated and experimentally verified. At the same time, the precipitation products were theoretically analyzed from the perspectives of dissolution equilibrium and Gibbs free energy. . The results show that the actual equilibrium concentration of antimony ions is greater than the theoretical concentration. The theoretical equilibrium concentration of antimony ions is 10 ~ (-10.92) mol / L at pH 4.6, and the experimental results show that at p When the minimum equilibrium concentration of 10 ~ (-3.8) mol / L. Under the condition of certain p H value, different precipitated products can be obtained. No Sb OCl exists in the theoretical calculation or verification experiment, and the product Sb 8 O 11 Cl 2 · H 2 O is obtained in the verification experiment.