The thermodynamics equilibrium principle was used to construct the diagrams for the concentration of complex ions(pc) vs pH,the distribution ratio of lead hydroxyl complex ions(αn) vs pH,and the conditional solubilit...The thermodynamics equilibrium principle was used to construct the diagrams for the concentration of complex ions(pc) vs pH,the distribution ratio of lead hydroxyl complex ions(αn) vs pH,and the conditional solubility product of Pb(OH)2 vs pH in the Pb2+-H2O system. The relationship between the equilibrium concentration of each kind of lead hydroxyl complex ions in equilibrium with Pb(OH)2(s) and pH value was shown in the system. The minimum solubility of lead is at the pH value of 10.096-10.997. The distribution ratio of each kind of the lead hydroxyl complex ions is determined as a function of the pH value and the total lead concentration([Pb]T). The diagram for the conditional solubility product,pKSP vs pH,shows that each kind of lead hydroxyl complex ions existing in the system is dependent upon an optimized pH value at the established concentration of [Pb]T,and that pKSP reaches the minimum at the pH value of 10.3-11.2. The results can provide a theoretical basis for removing lead ions from wastewater by the neutralization and hydrolyzation technology.展开更多
用等压法研究了298.15 K下L iC l-L i2B4O7-H2O体系在不同L iB4O7质量摩尔浓度时的等压平衡浓度,水活度;计算了L iC l和L i2B4O7混合盐溶液的渗透系数等热力学性质.用298.15 K下的实验数据对P itzer离子相互作用模型进行了参数化研究,...用等压法研究了298.15 K下L iC l-L i2B4O7-H2O体系在不同L iB4O7质量摩尔浓度时的等压平衡浓度,水活度;计算了L iC l和L i2B4O7混合盐溶液的渗透系数等热力学性质.用298.15 K下的实验数据对P itzer离子相互作用模型进行了参数化研究,拟合求取了298.15 K下P itzer离子相互作用参数,用获得的参数计算了L iC l和L i2B4O7在L iC l-L i2B4O7-H2O体系中的活度系数.P itzer模型计算的渗透系数值与实验结果一致.展开更多
基金Project(2007BAC25B01) supported by the National Key Project of Scientific and Technical Supporting Programs Funded by Ministry of Science and Technology of China during the 11th Five-Year PlanProject(308019) supported by the Key Scientific and Technical Project of Ministry of Education of ChinaProject(08JJ3020) supported by the Natural Science Foundation of Hunan Province, China
文摘The thermodynamics equilibrium principle was used to construct the diagrams for the concentration of complex ions(pc) vs pH,the distribution ratio of lead hydroxyl complex ions(αn) vs pH,and the conditional solubility product of Pb(OH)2 vs pH in the Pb2+-H2O system. The relationship between the equilibrium concentration of each kind of lead hydroxyl complex ions in equilibrium with Pb(OH)2(s) and pH value was shown in the system. The minimum solubility of lead is at the pH value of 10.096-10.997. The distribution ratio of each kind of the lead hydroxyl complex ions is determined as a function of the pH value and the total lead concentration([Pb]T). The diagram for the conditional solubility product,pKSP vs pH,shows that each kind of lead hydroxyl complex ions existing in the system is dependent upon an optimized pH value at the established concentration of [Pb]T,and that pKSP reaches the minimum at the pH value of 10.3-11.2. The results can provide a theoretical basis for removing lead ions from wastewater by the neutralization and hydrolyzation technology.
文摘用等压法研究了298.15 K下L iC l-L i2B4O7-H2O体系在不同L iB4O7质量摩尔浓度时的等压平衡浓度,水活度;计算了L iC l和L i2B4O7混合盐溶液的渗透系数等热力学性质.用298.15 K下的实验数据对P itzer离子相互作用模型进行了参数化研究,拟合求取了298.15 K下P itzer离子相互作用参数,用获得的参数计算了L iC l和L i2B4O7在L iC l-L i2B4O7-H2O体系中的活度系数.P itzer模型计算的渗透系数值与实验结果一致.
