副产物硫酸铵辅助制备氧化镁纳米棒

Byproduct sulfate ammonia-assisted synthesis of magnesium oxide nanorods

为了寻找规模化合成氧化镁纳米棒的新方法,通过氨水沉淀硫酸镁制备了花状氢氧化镁前驱体,探索了前驱体热分解过程中副产物硫酸铵的存在和煅烧温度对产物物相和形貌的影响。结果表明:表面吸附硫酸铵的花状氢氧化镁800℃煅烧2 h再洗涤,可以得到长度1~2μm、直径30~100 nm的氧化镁纳米棒;沉淀产物花状氢氧化镁经洗涤后再在600~800℃煅烧2 h,可以获得平均直径2μm的氧化镁纳米花;副产物硫酸铵对氧化镁纳米棒形成起了结构导向的作用。

To explore a novel scalable approach for synthesis ofmagnesium oxide（Mg O） nanorods,flower-like magnesium hydroxide（Mg（OH）2） precursors were prepared by chemical precipitation method using magnesium sulfate and ammonia hydroxide as raw materials. The effects of calcinations temperature and the presence of byproduct sulfate ammonia in the calcined precursors on phases and morphologies of the resultants were investigated. The results showed that the flower-like Mg（OH）2 with sulfate ammonia absorbed on the surface can evolve into nanorods with 1-2 μm in length and 30-100 nm in diameter after 2 h annealing at 800 ℃ and subsequent washing while the as-obtained flower-like Mg（OH）2 subjected to washing can yield Mg O nanoflowers with an average diameter of2 μm after 2 h annealing in range of 600-800 ℃. Hence the presence ofbyproduct sulfate ammonia in the calcination process plays a role in the growth of Mg O nanorods.