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Porous monolith of few-layered boron nitride for effective water cleanup

Journal Article


Abstract


  • Advanced sorbents for water purification need to be developed for environmental protection. Porous boron nitride (BN) is a high-end material for the removal of pollutants for its remarkable sorption characteristics and chemical inertia. However, it still suffers from thick pore walls, low yield and powdery state, limiting the performance. Herein, a borax-based template-free pyrolysis route is developed to massively produce the cellular monolith of a few-atomic-layered boron nitride. It possesses ultra-thin pore walls and uniform mesopores, resulting from the phase-separation-dominated pore-forming mechanism. Such a porous monolith is applied for water purification, showing high adsorption capacity on Congo red (1096 mg g-1), which is attributed to mesopores and surface polarity. It further exhibits unprecedented recyclability, relying on its anti-oxidation stability. A prototype of the water filter pitcher using this BN is finally demonstrated with commendable performances. The aerogel-like BN bulk material enables a high-capacity recyclable sorbent, representing a leap forward toward practical water purification.

Publication Date


  • 2022

Citation


  • Xu, C., Zeng, J., Gu, X., Wang, Y., Li, E., Zhang, C., . . . Wang, X. B. (2022). Porous monolith of few-layered boron nitride for effective water cleanup. Journal of Materials Chemistry A, 10(2), 846-854. doi:10.1039/d1ta08930g

Scopus Eid


  • 2-s2.0-85122890780

Start Page


  • 846

End Page


  • 854

Volume


  • 10

Issue


  • 2

Abstract


  • Advanced sorbents for water purification need to be developed for environmental protection. Porous boron nitride (BN) is a high-end material for the removal of pollutants for its remarkable sorption characteristics and chemical inertia. However, it still suffers from thick pore walls, low yield and powdery state, limiting the performance. Herein, a borax-based template-free pyrolysis route is developed to massively produce the cellular monolith of a few-atomic-layered boron nitride. It possesses ultra-thin pore walls and uniform mesopores, resulting from the phase-separation-dominated pore-forming mechanism. Such a porous monolith is applied for water purification, showing high adsorption capacity on Congo red (1096 mg g-1), which is attributed to mesopores and surface polarity. It further exhibits unprecedented recyclability, relying on its anti-oxidation stability. A prototype of the water filter pitcher using this BN is finally demonstrated with commendable performances. The aerogel-like BN bulk material enables a high-capacity recyclable sorbent, representing a leap forward toward practical water purification.

Publication Date


  • 2022

Citation


  • Xu, C., Zeng, J., Gu, X., Wang, Y., Li, E., Zhang, C., . . . Wang, X. B. (2022). Porous monolith of few-layered boron nitride for effective water cleanup. Journal of Materials Chemistry A, 10(2), 846-854. doi:10.1039/d1ta08930g

Scopus Eid


  • 2-s2.0-85122890780

Start Page


  • 846

End Page


  • 854

Volume


  • 10

Issue


  • 2