Boron-nitride/carbon-nanotube hybrid aerogels as multifunctional desulfurisation agents

Dong Xia, Heng Li, Peng Huang, Jamie Mannering, Umair Zafar, Daniel Baker, Robert Menzel

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Boron nitride particles were hybridised with electrically-conducting carbon nanotube aerogels to produce electrically-heatable sorbents for commercially-important adsorptive desulfurisation applications. Specifically, carbon-doped boron nitride structures (BN) were embedded within carbon nanotube (rCNT) aerogels by freeze-drying of aqueous BN-precursor/CNT mixtures followed by higherature thermal treatment. The resulting BN/rCNT aerogels showed considerably enhanced desulfurisation performance compared to pure BN powders, as evidenced by a 50% increase in organosulfur uptake (up to 43 mg S per g BN) and dramatically improved sorbent regeneration stability (90% performance retention after 5 regeneration cycles). The improved desulfurisation performance was linked to substantially increased meso-porosity and improved boron-sulfur interactions in the hybrid BN/rCNT hybrid aerogels as characterised via electron microscopy, BET, EDX mapping and post-sorption XPS. Importantly, the conductivity of the CNT scaffold enabled resistive heating of BN to very high temperatures (up to 700 °C) at low energy inputs and at very high heating rates (up to 74 °C s -1). The utility of resistive scaffold heating was demonstrated for energy-efficient thermal regeneration of exhausted BN/rCNT adsorbents over multiple regeneration cycles. The study demonstrates the essential advantages of hybridising BN with 3D nanocarbon networks, enhancing existing functional BN properties (sorption capacity, regeneration stability) while also introducing additional new functions (direct electrical framework heating). These findings therefore have clear implications for a wide range of BN applications, including water treatment, carbon capture, energy storage and electro-catalysis.

Original languageEnglish
Pages (from-to)24027-24037
Number of pages11
JournalJournal of Materials Chemistry A
Volume7
Issue number41
Early online date12 Sep 2019
DOIs
Publication statusPublished - 7 Nov 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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