Template-free synthesis of boron nitride foam-like porous monoliths and their high-end applications in water purification
Template-free synthesis of boron nitride foam-like porous monoliths and their high-end applications in water purification
复制标题
氮化硼泡沫状多孔整体材料的无模板合成及其在水净化中的高端应用
DOI：
10.1039/c5ta08134c
复制
发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Golberg, Dmitri
中科院分区：
文献类型：
--
作者：
Xue, Yanming;Dai, Pengcheng;Golberg, Dmitri
通过简单的方法制备bn基多孔整体体（bnpm）仍然是一个很大的困难和挑战。在这里，我们报道了一种全新的、高通量的bnpm合成方法，通过一个简单的两步无模板反应，包括自鼓泡前驱体凝固和高温热解。由此产生的具有相互连接的开泡结构的BNPM具有迄今为止BNPM系统中最高的比表面积，高达1406 m(2) g(-1)，并且具有类似于1 MPa的高体抗压强度。由于BNPM系统宽敞的疏水表面，该材料被应用于油/水系统的高效分离吸附净化，对各种油污染物的吸附容量高达71-98%（基于体积的吸附容量）。此外，所设计的bnpm作为过滤柱，在强制过滤-吸附过程中快速去除水溶液中的罗丹明B （RB）和Cd（II）污染物，其去除率分别为554 mg g（-1）和561 mg g（-1）。因此，所获得的bnpm被设想成为一种相当有前途的水清洗吸附剂。
It has remained a great difficulty and challenge to prepare BN-based porous monoliths (BNPMs) via a facile method. Here, we report a brand-new and high-throughput synthesis of BNPMs through a facile two-step template-free reaction including self-bubbling precursor solidification and high-temperature pyrolysis. The resulting BNPMs with an interconnected open-bubble structure exhibit the highest specific surface area ever reported for the BNPM systems, up to 1406 m(2) g(-1), and high bulk crush strength of similar to 1 MPa. Thanks to the spacious hydrophobic surfaces of the BNPM system, the material was applied for the highly efficient separation-adsorption purification of an oil/water system, demonstrating an excellent adsorption capacity of up to 71-98% (volume-based adsorption capacity) toward a wide selection of oil contaminants. Besides, the present BNPMs were designed as a filtration column which rapidly removed rhodamine B (RB) and Cd(II) pollutants from an aqueous solution under a forced filtration-adsorption process, corresponding to an ultrahigh removal capacity of 554 mg g(-1) and 561 mg g(-1), respectively. Thus, the obtained BNPMs are envisaged to become a fairly promising adsorbent for water cleaning.