硝酸镉污染高岭土电化学特性试验研究

发布时间：2018-01-13 02:04

  本文关键词：硝酸镉污染高岭土电化学特性试验研究　出处：《科学技术与工程》2016年31期 　论文类型：期刊论文

  更多相关文章： 硝酸镉 高岭土 电化学阻抗谱 时间常数 等效电路

【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。
[Abstract]:The electrochemical impedance spectra of kaolin with different contents of cadmium nitrate were measured and the corresponding equivalent circuit parameters were simulated by combining the Nyquist and Bode spectra. The results showed that the corresponding equivalent circuit parameters were obtained. At 6 h of pollution, with the increase of cadmium nitrate concentration, the Nyquist diagram of kaolin changed from quasi Randle to non Randle, the resistance of solution decreased and the capacitance of constant phase angle element increased. And the diffusion impedance gradually decreased to disappear; At 24 h of pollution, the Nyquist diagram of kaolin presents two time parameters, the electrochemical parameters, the solution resistance, the constant phase angle element, the solid-liquid interface resistance and the diffusion impedance. With the passage of time, the Cd2 produced by cadmium nitrate ionization of kaolin and pore solution produced a strong electrochemical action, and the density of kaolin system increased and the adsorbability of kaolinite system increased.
【作者单位】： 太原理工大学建筑与土木工程学院;
【基金】：国家自然科学基金(51208333) 山西省自然科学基金(2014011036-1,2014131019,01T2015)资助
【分类号】：TU41
【正文快照】： 山西省自然科学基金(2014011036-1,2014131019,01T2015)资助高岭土是一种非金属的黏土矿物,在我国储量丰富,普遍存在于广东、陕西、福建、江西等地。在工业生产方面,高岭土可作为添合剂广泛应用于造纸、陶瓷、橡胶、涂料等方面,是我国重要的工业矿产资源[1—3]。在对高岭土的，

本文编号：1416954