Hebei Key Laboratory of Boron Nitride Micro and Nano Materials

Tianjin, China

Hebei Key Laboratory of Boron Nitride Micro and Nano Materials

Tianjin, China

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Xue Y.,Japan International Center for Materials Nanoarchitectonics | Jiang B.,Japan National Institute of Materials Science | Jiang B.,University of Tsukuba | Bourgeois L.,Monash University | And 13 more authors.
Materials and Design | Year: 2015

Aluminum matrix composites loaded with various fractions of multi-walled, well-structured boron nitride nanotubes (BNNTs), up to 5 wt.% fractions, were fabricated using powder constituents by means of a high pressure torsion technique (HPT) at room temperature under 5 GPa pressurization. Transient ultrathin amorphous-like layers, with a thickness of 2-5 nm, composed of Al(BNO) phases, which formed under severe plastic deformation and developed under further heat treatments of the composites at 350 °C and 450 °C, were detected at the interfacial regions between Al grains and tightly embracing them BN layers. Room temperature hardness and tensile tests on fabricated composites before and after heat treatments were conducted. The highest value of room temperature tensile strength was obtained on Al-5 wt.% BNNT samples annealed at 450 °C, that reached up to ~420 MPa, thus exhibiting more than a doubled increase in strength compared to HPTfabricated pure Al samples under identical compacting conditions. © 2015 Elsevier Ltd.


Xue Y.,Japan International Center for Materials Nanoarchitectonics | Dai P.,China University of Petroleum - East China | Jiang X.,Japan International Center for Materials Nanoarchitectonics | Wang X.,Japan International Center for Materials Nanoarchitectonics | And 10 more authors.
Journal of Materials Chemistry A | Year: 2016

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. © The Royal Society of Chemistry 2016.


Li J.,Hebei University of Technology | Li J.,Hebei Key Laboratory of Boron Nitride Micro and Nano Materials | Huang Y.,Hebei University of Technology | Huang Y.,Hebei Key Laboratory of Boron Nitride Micro and Nano Materials | And 21 more authors.
Journal of Materials Chemistry A | Year: 2015

Adsorption represents an efficient and economical approach for water purification and substantial research is being performed to develop effective sorbent materials. Porous boron nitride (BN) composed of light elements is considered as a promising candidate for pollution treatment due to its unique polarity of B-N bonds, high specific surface area, numerous structural defects, chemical stability, and oxidation resistance. However, the adsorption performance based on porous BN is hindered by either few activated sites or a low degree of crystallinity. In this work, we have developed a simple chemical method to activate pre-obtained well-crystallized porous BN fibers in acid solution. The successful chemical activation has been identified by FTIR spectra and zeta potential measurements. Benefiting from these advantageous features, the activated BN fibers with high stability exhibited enhanced cationic dye removal performance compared to the un-activated ones. The effects of pH value, contact time, temperature and adsorbent amount on the methylene blue (MB) adsorption properties were analyzed. The adsorption equilibrium data were interpreted in terms of Langmuir and Freundlich models and the results showed that Langmuir isotherms best represent the adsorption system. The maximum adsorbed amount for MB was as high as 392.2 mg g-1 at pH 8.0 and 30 °C. The adsorption rate was sharply enhanced after chemical activation. The excellent reusability of the activated BN was also confirmed. It is shown that chemical activation plays a key role in enhanced dye adsorption performance. Therefore, our developed chemical activation method for porous BN fibers opens the door toward the practical application of activated BN for drinking water purification. © The Royal Society of Chemistry 2015.


Wang S.,Hebei University of Technology | Wang S.,Hebei Key Laboratory of Boron Nitride Micro and Nano Materials | Xu X.,Hebei University of Technology | Xu X.,Hebei Key Laboratory of Boron Nitride Micro and Nano Materials | And 12 more authors.
Journal of Alloys and Compounds | Year: 2016

We carried out both the experimental and theoretical investigations on the synthesis and photocatalytic performance of the visible-light responded, W and N co-doped NaTaO3 powders. The nanocubic NaTa1-xWxO3-xNx (x = 0.00, 0.01, 0.03, 0.05, 0.1) particles with a range of 100-200 nm in size have been successfully synthesized at 700°C via the NaOH flux reaction method. The microstructure, chemical composition and optical absorption of the as-prepared photocatalysts were discussed in detail. The photocatalytic performance of as-prepared powders was evaluated by decolarization of rhodamine B (RhB) under visible light irradiation with the wavelengths longer than 400 nm. The optical band gap of NaTaO3 could be significantly reduced through the co-doping of W and N. The degradation efficiency of RhB over the NaTaO3 with co-doping of W and N in the charge-compensated mode was remarkably improved. Furthermore, the first-principle calculations were also performed to discover the effects of co-doping of W and N on the electronic structure of NaTaO3. These present results provide a simple and feasible route to design new photocatalysts based on NaTaO3 or other oxide photocatalysts. © 2016 Elsevier B.V. All rights reserved.


Wang S.,Hebei University of Technology | Wang S.,Hebei Key Laboratory of Boron Nitride Micro and Nano Materials | Xu X.,Hebei University of Technology | Xu X.,Hebei Key Laboratory of Boron Nitride Micro and Nano Materials | And 12 more authors.
Science of Advanced Materials | Year: 2016

Tantalum nitride (Ta3N5) photocatalyst was synthesized by ammonization of the water-soluble tantalum oxalate precursors. The monolithic Ta3N5 nanoparticles with the average size of 40 nm were prepared at 800 °C in the flowing ammonia. Various analytic techniques had been applied to characterize the phase transformation, microstructure, optical absorption and photocatalytic activity of the well-crystallized Ta3N5 particles. The asprepared Ta3N5 nanoparticles exhibited higher photocatalytic activity for the degradation of methylene blue and rhodamine B under visible light irradiation than bulk Ta3N5 particles. This work provides a new approach to design and fabricate Ta3N5 nanostructure, the promising candidate for visible-light photocatalyst. © 2016 by American Scientific Publishers.

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