| 纳米级TiO2粉体的制备研究——Ⅱ.絮凝剂及其浓度的影响 |
| A STUDY OF THE PREPARATION OF ULTRAFINE TiO2 PARTICLES——Ⅱ.EFFECTS OF FLOCCULATING AGENTS AND CONCENTRATION |
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| 摘要: 采用溶胶-凝胶-超临界流体干燥(SCFD)法制备纳米级TiO2超细粉，详细考察了不同絮凝剂及其浓度对TiO2织构和结构性质的影响。结果表明，利用强碱溶液作为絮凝剂，浓度为5 mol·L-1是制备大孔高比表面TiO2超细粉较为适宜的条件。 |
| 关键词: 超临界流体干燥法 TiO2 超细粉 絮凝剂 |
| 基金项目: |
| Abstract: Ultrafine titania powders were prepared by hydrolysis of titanium tetrachloride at room temperature followed by the supercritical drying method. The influence of preparation parameters on the textural and structural properties of titania, including the different flocculating agents and concentration, had been studied in detail. The titania powders had the smaller BET surface area and pore volume with the increase of pH values using aqueous ammonia as the flocculating agent. On the contrary, using NaOH solution (5 mol·L-1) as the flocculating agent, the titania powders obtained had the larger BET surface area and pore volume with the increase of pH (>7) values. All the titania powders were crystallized in the form of anatase regardless of the preparation conditions. |
| Keywords: supercritical fluid drying TiO2 ultrafine powder flocculating agent |
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| 董国利,高荫本,陈诵英.纳米级TiO2粉体的制备研究——Ⅱ.絮凝剂及其浓度的影响[J].无机化学学报,1998,14(3):327-332. |
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