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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。
Using citric acid as adsorbent, the surface charge of MnCO3 particles was modified. The effects of citric acid concentration, pH value and adsorption temperature on the adsorption of citric acid on the surface of MnCO3 particles were studied. The results showed that with the increase of citric acid concentration, the adsorption amount of citric acid on the surface of MnCO3 particles increased gradually, and the adsorption equilibrium reached at the concentration of citric acid of 1.0 g / L. At pH 6 ~ 11, The absolute value of the potential is greater than 30 mV; the adsorption amount of citric acid on the surface of MnCO3 particles increases with the increase of adsorption temperature in the range of 30 ~ 45 ℃; the adsorption of citric acid on the surface of MnCO3 particles accords with the Langmuir adsorption model , Its instantaneous monolayer adsorption process in line with the first-order kinetic equation. Under the optimal conditions of citric acid solution concentration of 1.0 g / L, ultrasonic frequency of 60 kHz, pH value of 7, adsorption reaction time of 40 min and adsorption temperature of 45 ℃, the surface of MnCO3 particles was negatively charged and Modified MnCO3 particle suspension system can maintain good stability.