醇铝水解水热法制备纳米勃姆石粉体

Synthesis of Nano-Boehmite Powder by Aluminum Alcoholate Hydrolysis Followed by Hydrothermal Method

摘要: 以异丙醇铝为原料，先通过水解法制备拟薄水铝石，再以拟薄水铝石为原料经水热反应制备纳米勃姆石粉末。研究了水解液对异丙醇铝水解产物的物相和粒度分布的影响；同时也考察了水热温度对水热产物勃姆石的物相和粒度分布的影响，并利用XRD和激光粒度分析仪对水解产物和水热产物进行结构和粒度表征。研究结果表明：异丙醇铝在以水/异丙醇为1:1体积比的混合液中，在65℃水解3小时，所得产物为拟薄水铝石，粉体过滤性能较好，粒度分布窄，中粒径为7.34 um。所得拟薄水铝石在200℃下纯水中水热反应10小时，所得产物为结晶度良好的勃姆石，粒度分布窄，中粒径为87 nm。

Abstract: Using isopropyl aluminum as the raw material, nano-boehmite powders were synthesized via hydrolysis followed by hydrothermal method. The study investigated the influence of the hydrolysis solution on the phase composition and particle size distribution of the hydrolysate, as well as the effects of hydrothermal temperature on the phase and particle size distribution of the hydrothermal product. Structural and particle size characterization was performed using X-ray diffraction (XRD) and laser particle size analyzers. The results indicated that when isopropyl aluminum was hydrolyzed in a 1:1 (Vol) mixture of water and isopropanol at 65˚C for 3 hours, the hydrolysate was pseudo-boehmite, which exhibited good filtration performance, a narrow particle size distribution, and an average particle size of 7.34 µm. The resulting pseudo-boehmite underwent hydrothermal treatment in pure water at 200˚C for 10 hours, yielding boehmite with good crystallinity, a narrow particle size distribution, and an average particle size of 87 nm.