可控尺寸和形貌的多钼酸聚集体和MoO_3粉体的制备

Preparation of Molybdic Acid Aggregates and Molybdenum Trioxide Powder with Controllable Size and Morphology

钼酸铵在醋酸和十六烷基三甲基溴化铵(CTAB)调节下分别与硝酸和盐酸反应制备了多钼酸聚集体.结果表明,钼酸铵的浓度、醋酸和CTAB对多钼酸聚集体及其烧结后形成MoO_3粉体的形貌和尺寸有影响.较高浓度的钼酸铵分别在醋酸和CTAB调节下与硝酸反应均可制备直径为1～2μm,长为数十微米的细长晶须,经过500～600℃烧结后则相应变为纳米级片状和颗粒状α-MoO_3粉体;低浓度的钼酸铵在CTAB调节下与盐酸反应可制备不规则的晶体棒,经过烧结后得到颗粒状α-MoO_3粉体.

Molybdic acid aggregates were prepared by the reaction of ammonium molybdate with HNO3 and HCl in a coexisting HAc or cetyl-trimethyl ammonium bromide （CTAB） solution, respectively. The results indicate that the size and morphology of as-prepared molybdic acid aggregates and annealed products-α-MoO3 powder were affected by the concentration of ammonium molybdate, HAc and CTAB. The molybdic acid aggregates with diameter of 1-2μm and length of several decades-micron can be obtained by the reaction of higher-concentration ammonium molybdate with HNO3 in a coexisting HAc or CTAB solution, repectively. After the as-prepared molybdic acid aggregates are annealed at 500-600℃ for 3h, the nanometert-scaled lamellate and sub-micrometer MoO3 powder are prepared. In addition, irregular molybdic acid aggregates rods are achieved by the reaction of lower-concentration ammonium molybdate with HCl in a coexisting CTAB solution.