【摘要】 研究了在 200℃,6 小时水热过程中不同 pH 条件对合成纳米二氧化钛粉体等电点的影响。以偏钛酸为原料,用 NaOH 和 HCl 调节酸碱度,在不同 pH 条件下水热合成了二氧化钛微粒,其平均粒径均在 15~40nm。对不同 pH 条件下制得的二氧化钛微粒进行了 Zeta 电位、XRD 和 TEM 表征。微粒晶型为锐钛型。对微粒的等电点进行分析,不同的 pH 水热反应条件影响到合成粉体吸附的表面羟基数量,从而影响到微粒的等电点。 在 pH1,3,5,11,13 水热条件下制得的微粒等电点为 5.5,在 pH 7,9 水热条件下制得的微粒等电点为 4.5 。反应物料在酸性水热条件下反应后酸性增强,在碱性水热条件下反应后碱性增强。更多还原

【Abstract】 Through the hydrothermal process at 200℃ for 6h and using the metatitanic acid as reactant, the nanometer titanium dioxide powder were synthesized under different pH values adjusted by NaOH or HCl solution. The synthesized powders were characterized by Zeta potential, XRD and TEM. The TEM photographs show that the crystal structures are all anatase. The influence of pH on the isoelectric points of the synthesized titanium dioxide powders was studied and it shows that the pH conditions could influence the quantity of surface hydroxyl absorbed by the synthesized powders, thus influence the isoelectric points. Isoelectric points of the powders prepared in hydrothermal process with pH 1,3,5,11,13 are 5.5. and those in hydrothermal process with pH 7,9 are 4.5. When the hydrothermal reaction is processed in the acid solution then the acidness of the reactant will be increased, and when the reaction is processed in the alkaline solution, then the increase will be the alkelity of the reactant.更多还原