前驱体法制备多形貌介孔h-BN

Preparation of Polymorphic Mesoporous h-BN by Precursor Method

以硼酸和三聚氰胺为主要原料,经微波反应,制得了不同形貌h-BN样品,分别对样品的形貌、结构、纯度和吸附性能进行了表征。研究结果显示:与烘干干燥方式相比,冷冻干燥获得的样品更为细长,冷冻处理获得样品的长径比是烘干处理的3~6倍;与未添加表面活性剂的样品相比,添加表面活性剂制得的样品轮廓更为鲜明;添加盐不仅可以促进晶体生长,能使样品的形貌呈现多样性,可以产生方片状和原片状的纳米片。此外,该方法所得的h-BN具有较多的介孔,对亚甲基蓝具有较好的吸附能力,10 min吸附率高达91%以上。

h-BN samples with different morphology were prepared by microwave reaction with boric acid and melamine as main raw materials.The morphology,structure,purity and adsorption property of the samples were characterized.The results show that:compared with the drying method,the samples obtained by freeze-drying are more slender,and the length-diameter ratio of samples obtained by freeze-drying is 3-6 times higher than that by drying.Compared with the samples without surfactant,the samples with surfactant are more distinct.The addition of salt can not only promote the crystal growth,but also make the morphology of the sample diverse,and produce square and original flake nanocrystals.In addition,the h-BN obtained by the method has more mesoporous and good adsorption capacity for methylene blue,and the adsorption rate of 10 min is as high as 91%or more.