中文摘要：

通过对不同含量硝酸镉的高岭土进行电化学阻抗谱进行测试,结合其Nyquist和Bode图谱模拟出相应的等效电路参数。分析结果表明,在污染6 h时,随着硝酸镉浓度增加,高岭土Nyquist图中呈现出由准Randle向非Randle变化,溶液电阻减小、常相位角元件电容增大、以及扩散阻抗逐渐减小至消失;在污染24 h时,高岭土Nyquist图中呈现出两个时间参数,电化学参数溶液电阻、常相位角元件、固液界面电阻、扩散阻抗均有所改变;随着时间的推移,高岭土与孔隙溶液硝酸镉电离出的Cd2＋产生较强的电化学作用,高岭土体系密实度增大吸附性增强。

英文摘要：

Based on electrochemical impedance spectrum test results of different cadmium nitrate content of kao- lin soil, and according to the Nyquist and Bode graphs the corresponding equivalent circuit parameters were simula- ted, The analysis results show that the pollution at 6 hour, with the increase of cadmium nitrate concentration, kao- lin Nyquist diagram mode presents from Randle to Non-Randle mode. Solution resistance of circuit parameters de- creases, phase angle of capacitance increase, the solid liquid interface resistance, and diffusion impedance de- crease gradually to disappear. When pollution at 24 hour, kaolin Nyquist diagram shows two time parameters, the electrochemical parameters of solution resistance, angle of phase capacitor, solid-liquid interface resistance, diffu- sion impedance changes as same as those at 6 hour. With the time increasing, kaolin system compactness increases with effect action of adsorption due to electrochemical effect Cd2 ＋ between kaolin particles and cadmium nitrate ioni- zation of pore solution.