【摘要】 本文报道了在Ca（NO3）2溶液中，氧化铝的水悬浮液的电位滴定数据，根据实测表面电荷密度与理论计算值的比较，认为在界面上生成了络合物（S-O）2Ca。电位滴定是在Ca（NO3）2浓度0．0033、0．033、0．33mol／L下进行的，并由此测定了在氧化铝／水界面上三层模型的参数。利用所得参数，计算了表面电荷、电势及各表面组分的浓度随Ca（NO3）2浓度和pH的变化，并将此结果与在NaNO3溶液中的进行比较。结果表明，在Ca（NO3）2溶液中比在NaNO3溶液中，PZNPC向低pH值移动，从7．4降到6．8。更多还原

【Abstract】 Based on a reasonable description of experimental observation of surface charge, it was suggested that the surface complex (S - O)2Ca is formed at alumina/water interface in Ca(NO3 )2 solution, and the parameters for triple layer model(TLM) at alumina/water interface were respectively determined from the potentiometric titration data, the measurements were performed in Ca(NO3 )2 solutions of different concentrations from 0. 0033 to 0. 33mol/L. By using these parametersobtained, an estimation of variations of the surface charge, POtentials and distributions of surface species concentrations as a function of PH and the concentration of Ca(NO3)z were calculated and the results were compared with those in NaNO3 solution. It was found that strong complexation Of Ca2+ on alumina/water interfaceshifts the PZNPC toward lower PH value.更多还原