Song Yangxi, Li Bin, Yang Siwei, Ding Guqiao, Zhang Changrui, Xie Xiaoming
Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, 109 Deya Road, Changsha 410073, PR China.
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, PR China.
Sci Rep. 2015 May 15;5:10337. doi: 10.1038/srep10337.
Boron nitride (BN) aerogels are porous materials with a continuous three-dimensional network structure. They are attracting increasing attention for a wide range of applications. Here, we report the template-assisted synthesis of BN aerogels by catalyst-free, low-pressure chemical vapor deposition on graphene-carbon nanotube composite aerogels using borazine as the B and N sources with a relatively low temperature of 900 (°)C. The three-dimensional structure of the BN aerogels was achieved through the structural design of carbon aerogel templates. The BN aerogels have an ultrahigh specific surface area, ultralow density, excellent oil absorbing ability, and high temperature oxidation resistance. The specific surface area of BN aerogels can reach up to 1051 m(2) g(-1), 2-3 times larger than the reported BN aerogels. The mass density can be as low as 0.6 mg cm(-3), much lower than that of air. The BN aerogels exhibit high hydrophobic properties and can absorb up to 160 times their weight in oil. This is much higher than porous BN nanosheets reported previously. The BN aerogels can be restored for reuse after oil absorption simply by burning them in air. This is because of their high temperature oxidation resistance and suggests broad utility as water treatment tools.
氮化硼（BN）气凝胶是具有连续三维网络结构的多孔材料。它们在广泛的应用中受到越来越多的关注。在此，我们报道了通过在900 (°)C的相对低温下，以硼嗪作为硼和氮源，在石墨烯-碳纳米管复合气凝胶上进行无催化剂、低压化学气相沉积，以模板辅助合成BN气凝胶。BN气凝胶的三维结构是通过碳气凝胶模板的结构设计实现的。BN气凝胶具有超高的比表面积、超低的密度、优异的吸油能力和高温抗氧化性。BN气凝胶的比表面积可达1051 m(2) g(-1)，比已报道的BN气凝胶大2至3倍。质量密度可低至0.6 mg cm(-3)，远低于空气。BN气凝胶具有高疏水性，能吸收高达其重量160倍的油。这比先前报道的多孔BN纳米片要高得多。BN气凝胶在吸油后只需在空气中燃烧即可恢复再利用。这是由于它们的高温抗氧化性，表明其作为水处理工具具有广泛的用途。
