Ni-NH_3-H_2O-SO_4^(2-)体系的热力学平衡

Thermodynamic Equilibrium of Ni-NH_3-H_2O-SO_4^(2-) System

根据热力学数据,考虑到活度的影响,对Ni-NH_3-H_2O-SO_4^(2-)体系的[Ni^(2+)]T进行理论计算,得到[Ni^(2+)]T与a(OH-)、[NH3]和[SO_4^(2-)]的关系式,并采用MATLAB由[Ni^(2+)]T试验值求出系数。结果表明:Ni-NH_3-H_2O-SO_4^(2-)体系中,[Ni^(2+)]T随pH增大而减小;低浓度NH3对[Ni^(2+)]T几乎无影响,高浓度SO_4^(2-)使[Ni^(2+)]T增大。了解这些关系对含镍废水的处理有一定指导意义。

Considering the activityrs influence, [Ni2＋ IT in the Ni-NH3-HzO-SO]- system was calculated and the relation of [Ni2 ＋ IT, a （OH-）, [- N H3 ] and [ SO4^2- ] was got based on relative thermodynamic data. The relation coefficient was calculated based on experimental [Ni2＋ IT value by MATLAB. The results show that [Ni2＋ IT decreases with increasing of system pH. Low concentration [NH3 ] has little influence on [Ni2＋ IT and high concentration SO4^2- makes [Ni2＋ ]T increase. The relation provides some guidance for treating wastewater containing nickel ion.