柠檬酸三钠和纳米Al203胶体体系吸附性和稳定性的研究

为了降低纳米Al2O3粉体的表面活性,充分发挥其纳米性能,通过黏度和沉降试验定性地表征了柠檬酸三钠在Al2O3粉体上的吸附情况,并且用紫外-可见分光光度计研究了在pH=10时柠檬酸三钠在纳米Al2O3粉体上的定量吸附情况,测量波长为198nm.用透射电镜观察吸附前后的形貌.结果表明:当浆料的pH=10时,柠檬酸三钠在纳米Al2O3粉体上的吸附满足Langmuir单层吸附,最大吸附量为1.583mg/mL,此时,柠檬酸的量相对于Al2O3粉体为2.5%,恰好黏度最低,沉降速度也最小,即胶体的稳定性和吸附性同时达到最佳.

Study on Absorption and Stability of Sodium Citrate ori Nario-A1203 Colloform System

In order to reduce surfacation active of nano-alumina, make full use of its nano advantage, adsorption characteristic of sodium citrate on nano-alumina was analyzed qualitatively by sedimentation and viscosity experiments. And adsorption quantity of sodium citrate on nano-alumina was measured under pH = 10 by UV spectrum. The wavelength was 198nm. Adsorption images were observed by TEM. The results show that adsorption behaviors accord with langmuir monolayer adsorption. The maximum of adsorption is 1. 583mg/mL. When pH value is 10 and the amount of sodium citrate relative to nano-alumina is 2.5 percent, the viscosity and the sedimentation velocity can get the lowest value. That is to say, stability and adsorptive capability reach optimal effect, together.