硅酸盐学报

柠檬酸对碳酸锰单分散粒子表面的电荷改性

作者：吕春玲张景林

单位：中北大学化工与环境学院太原 030051

关键词：碳酸锰柠檬酸电荷改性 zeta 电位

分类号：TB321；TB34

出版年,卷(期):页码：2011,39(5):21-25

DOI：

摘要：

用柠檬酸作为吸附剂，对MnCO3微粒表面电荷进行了改性。研究了柠檬酸溶液浓度、pH 值和吸附温度对柠檬酸在MnCO3微粒表面吸附改性的影响。结果表明：随柠檬酸浓度的增加，MnCO3微粒表面对柠檬酸的吸附量逐渐增大，在柠檬酸浓度为1.0 g/L附近达到吸附平衡；当pH 值在6～11时，MnCO3颗粒表面ξ电位的绝对值均大于30 mV；在吸附温度为30～45 ℃范围内，MnCO3微粒表面对柠檬酸的吸附量随吸附温度的提高而增大；柠檬酸在MnCO3颗粒表面的吸附符合Langmuir吸附模型，其瞬间单分子层吸附过程符合一级动力学方程。在柠檬酸溶液浓度为1.0 g/L，超声频率为60 kHz，pH值为7，吸附反应时间为40 min，吸附反应温度为45 ℃的优化条件下，改性后MnCO3颗粒表面带负电，且改性后的MnCO3微粒悬浮液体系能保持良好稳定性。

The surface of MnCO3 particles was modified using citric acid as an absorbent. Effects of concentration of citric acid, pH value and adsorption reaction temperature on the surface modification of MnCO3 particles were investigated. The results show that the adsorptive capacity of citric acid on the surface of MnCO3 particles increases with increasing citric acid concentration, and reaches the adsorption equilibrium at the 1.0 g/L. The zeta-potential was over 30 mV when the pH value increased from 6 to 11. The adsorptive capacity of citric acid on the surface of MnCO3 particles increased with increasing temperature from 30 ℃ to 45 ℃. The adsorption of citric acid on the surface of MnCO3 particles followed the Langmuir isotherm, and the adsorption process of temporal monolayer followed the first-order reaction kinetic integral equation. The electric property on the surface of MnCO3 particles modified by citric acid was electronegative at citric acid concentration of 1.0 g/L, ultrasonic frequency of 60 kHz, pH value of 7, adsorption reaction time of 40 min and adsorption reaction temperature of 45 ℃. The suspension of MnCO3 particles modified showed a superior stability.

基金项目：

国家教育部高等学校博士学科点专项基金(20040110009)资助项目

作者简介：

副教授

参考文献：

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