Boron nitride-based materials for the removal of pollutants from aqueous solutions: a review.

Spray-assisted assembled spherical boron nitride as fillers for polymers with enhanced thermally conductivity

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 m2 g−1, and high bulk crush strength of ∼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.

Template-free synthesis of boron nitride foam-like porous monoliths and their high-end applications in water purification

Synthesis of magnetic graphene oxide grafted polymaleicamide dendrimer nanohybrids for adsorption of Pb(II) in aqueous solution.

Monolithic supermacroporous hydrogel prepared from high internal phase emulsions (HIPEs) for fast removal of Cu2+ and Pb2+

Here, we report the synthesis of nanosheet-structured boron nitride spheres (NSBNSs) by a catalyzing thermal evaporation method from solid B powders. The NSBNSs consist of radially oriented ultrathin nanosheets with the sheet edges oriented on the surface. Formation of this unique structure occurs only at a certain reaction temperature. The diameter from 4 μm to 700 nm and the nanosheet thickness from 9.1 to 3.1 nm of the NSBNSs can be well-controlled by appropriately changing the mass ratio of boron powders and catalyst. The NSBNSs possess versatile adsorption capacity, exhibiting excellent adsorption performance for oil, dyes, and heavy metal ions from water. The oil uptake reaches 7.8 times its own weight. The adsorption capacities for malachite green and methylene blue are 324 and 233 mg/g, while those for Cu2+, Pb2+, and Cd2+ are 678.7, 536.7, and 107.0 mg/g, respectively. The adsorption capacities of the NSBNSs for Cu2+ and Pb2+ are higher or much higher than those of the adsorbents reported previou...

Muqi Qian

Papers

Nanosheet-Structured Boron Nitride Spheres with a Versatile Adsorption Capacity for Water Cleaning