| Mg-Al-NO_3层状双金属氢氧化物电性质研究 |
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| 引用本文： | 金志琳,侯万国,张春光,孙祉伟,杨亲正,孙德军,戴国亮. Mg-Al-NO_3层状双金属氢氧化物电性质研究[J]. 化学学报, 2003, 61(8): 1208-1212 |
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| 作者姓名： | 金志琳 侯万国 张春光 孙祉伟 杨亲正 孙德军 戴国亮 |
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| 作者单位： | 1. 山东大学胶体与界面化学教育部重点实验室,济南,250100
2. 中国科学院力学研究所,国家微重力实验室,北京,100080 |
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| 基金项目： | 国家自然科学基金(No.29873026)和教育部跨世纪人才基金资助项目. |
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| 摘 要： | 采用电泳法和电势滴定法测定出不同电解质（LiCl,NaCl和KCl）溶液中Mg-Al- NO_3层状双金属氢氧化物（Mg-Al-NO_3LDH）颗粒的ξ电位、等电点、永久电荷密 度以及零电荷点等电化学物理量，探讨了电解质、pH和样品化学组成对Mg-Al- NO_3LDH电性质的影响，研究发现一价阳离子Li~+,Na~+,K~+对Mg-Al-NO_3LDH颗粒 的等电点有影响，电荷点依次增大，而等电点依次降低。
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| 关 键 词： | 电解质 氯化锂 氯化钠 氯化钾 氢氧化镁 氢氧化铝 电位 等电点 电性质 |
| 修稿时间： | 2002-12-20 |
Studies on Electric Property of Mg-Al-Nitrate Layered Double Hydroxide |
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| Affiliation: | Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Shangdong University;National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Science |
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| Abstract: | Electrochemical parameters of Mg-Al-NO3LDH particles in different electrolytic solutions (LiCl, NaCl and KC1), including zeta potential, isoelectric point (Ph_(IEP)), permanent charge density (σ_P), and zero point of charge (pH_(ZPC)) have been measured by electrophoresis method and potentiometric titration. Effects of electrolyte, pH, and chemical composition on electric property of the positive sol were investigated. It has been found that the Ph_(IEP) decreases with the sequence of Li+, Na+, K+. Because of the permanent positive charge, the pH_(IEP) is not equal to the Ph_(ZPC); The values of bothσ_P and Ph_(ZPC) of Mg-Al-NO3IDH increase with the increase of the contents of Al3+ in the LDH samples, whereas the corresponding pHjEp decreases rather than the increase. |
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| Keywords: | layered double hydroxide isoelectric point zero point of charge permanent charge density potentiometric titration |
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