scholarly journals Formation Mechanism and Porosity Development in Porous Boron Nitride

2021 ◽  
Author(s):  
Anouk L'Hermitte ◽  
Daniel M. Dawson ◽  
Pilar Ferrer ◽  
Kanak Roy ◽  
Georg Held ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Formation Mechanism ◽  
High Surface ◽  
Scale Up ◽  
High Surface Area ◽  
Inorganic Materials ◽  
Full Potential ◽  
Gaseous Species ◽  
Water Cleaning ◽  
Porosity Development

In the past decade, porous boron nitride (BN) has proven promising as a novel class of inorganic materials in the field of separations and particularly adsorption. Owing to its high surface area and thermal stability, porous BN has been researched for CO2 capture and water cleaning, for instance. However, most research remains at laboratory scale due to a lack of understanding of the formation mechanism of porous BN, which is still largely a ‘black box’ and prevents scale-up. Partial reaction pathways have been unveiled, but they omit critical steps in the formation, including the porosity development, which is key to adsorption. To unlock the potential of porous BN at a larger scale, we have investigated its formation from the perspective of both chemical formation and porosity development. We have characterised reaction intermediates obtained at different temperatures with a range of analytical and spectroscopic tools. Using these analyses, we propose a mechanism that highlights the key stages of BN formation and its porosity, including the intermediates and gaseous species formed in the process. We identified that the formation of non-porous carbon nitride is crucial to form porous BN with release of porogens, such as HCN and CO2. This work paves the way for scaled-up processes to use porous BN to its full potential at industrial level for gas and liquid separations.

scholarly journals Developing Eco-Friendly and Cost-Effective Porous Adsorbent for Carbon Dioxide Capture

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1962
Author(s):  
Mahboubeh Nabavinia ◽  
Baishali Kanjilal ◽  
Noahiro Fujinuma ◽  
Amos Mugweru ◽  
Iman Noshadi
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Co2 Capture ◽  
High Surface ◽  
Scale Up ◽  
Polymer Networks ◽  
High Surface Area ◽  
Excellent Thermal Stability ◽  
Doped Polymers ◽  
Metal Doped

To address the issue of global warming and climate change issues, recent research efforts have highlighted opportunities for capturing and electrochemically converting carbon dioxide (CO2). Despite metal doped polymers receiving widespread attention in this respect, the structures hitherto reported lack in ease of synthesis with scale up feasibility. In this study, a series of mesoporous metal-doped polymers (MRFs) with tunable metal functionality and hierarchical porosity were successfully synthesized using a one-step copolymerization of resorcinol and formaldehyde with Polyethyleneimine (PEI) under solvothermal conditions. The effect of PEI and metal doping concentrations were observed on physical properties and adsorption results. The results confirmed the role of PEI on the mesoporosity of the polymer networks and high surface area in addition to enhanced CO2 capture capacity. The resulting Cobalt doped material shows excellent thermal stability and promising CO2 capture performance, with equilibrium adsorption of 2.3 mmol CO2/g at 0 °C and 1 bar for at a surface area 675.62 m2/g. This mesoporous polymer, with its ease of synthesis is a promising candidate for promising for CO2 capture and possible subsequent electrochemical conversion.

High-surface area ceramic-derived boron-nitride and its hydrogen uptake properties

2013 ◽  
Vol 1 (4) ◽  
pp. 1014-1017 ◽  
Author(s):  
Jinhong Kim ◽  
Jisun Han ◽  
Moonsu Seo ◽  
Shinhoo Kang ◽  
Dongok Kim ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Hydrogen Uptake

scholarly journals Boron Nitride as a Novel Support for Highly Stable Palladium Nanocatalysts by Atomic Layer Deposition

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 849 ◽  
Author(s):  
Matthieu Weber ◽  
Cassandre Lamboux ◽  
Bruno Navarra ◽  
Philippe Miele ◽  
Sandrine Zanna ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Atomic Layer Deposition ◽  
Photoelectron Spectroscopy ◽  
High Surface ◽  
High Surface Area ◽  
Atomic Layer ◽  
Average Diameter ◽  
Transmission Electron Microscopy Analysis ◽  
Layer Deposition ◽  
Palladium Nanocatalysts

The ability to prepare controllable nanocatalysts is of great interest for many chemical industries. Atomic layer deposition (ALD) is a vapor phase technique enabling the synthesis of conformal thin films and nanoparticles (NPs) on high surface area supports and has become an attractive new route to tailor supported metallic NPs. Virtually all the studies reported, focused on Pd NPs deposited on carbon and oxide surfaces. It is, however, important to focus on emerging catalyst supports such as boron nitride materials, which apart from possessing high thermal and chemical stability, also hold great promises for nanocatalysis applications. Herein, the synthesis of Pd NPs on boron nitride (BN) film substrates is demonstrated entirely by ALD for the first time. X-ray photoelectron spectroscopy indicated that stoichiometric BN formed as the main phase, with a small amount of BNxOy, and that the Pd particles synthesized were metallic. Using extensive transmission electron microscopy analysis, we study the evolution of the highly dispersed NPs as a function of the number of ALD cycles, and the thermal stability of the ALD-prepared Pd/BN catalysts up to 750 °C. The growth and coalescence mechanisms observed are discussed and compared with Pd NPs grown on other surfaces. The results show that the nanostructures of the BN/Pd NPs were relatively stable up to 500 °C. Consequent merging has been observed when annealing the samples at 750 °C, as the NPs’ average diameter increased from 8.3 ± 1.2 nm to 31 ± 4 nm. The results presented open up exciting new opportunities in the field of catalysis.

Porous boron nitride with a high surface area: hydrogen storage and water treatment

2013 ◽  
Vol 24 (15) ◽  
pp. 155603 ◽  
Author(s):  
Jie Li ◽  
Jing Lin ◽  
Xuewen Xu ◽  
Xinghua Zhang ◽  
Yanming Xue ◽  
...  
Keyword(s):  
Water Treatment ◽  
Boron Nitride ◽  
Hydrogen Storage ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area

scholarly journals Design and Modeling of Novel Low-Pressure Nanofiltration Hollow Fiber Modules for Water Softening and Desalination Pretreatment

2018 ◽  
Author(s):  
Omar Labban
Keyword(s):  
Hollow Fiber ◽  
Transport Model ◽  
High Surface ◽  
Scale Up ◽  
High Surface Area ◽  
Volume Ratio ◽  
Low Pressure ◽  
System Level ◽  
Great Promise ◽  
Module Design

Given its high surface area to volume ratio and desirable mass transfer characteristics, the hollow fibermodule configuration has been central to the development of RO and UF technologies over the past fivedecades. Recent studies have demonstrated the development of a novel class of low-pressure nanofiltration(NF) hollow fiber membranes with great promise for scale-up implementation. Further progress on large-scaledeployment, however, has been restrained by the lack of an accurate predictive model, to guide module designand operation. Earlier models targeting hollow fiber modules are only suitable for RO or UF. In this work,we propose a new modeling approach suitable for NF based on the implementation of mass and momentumbalances, coupled with a validated membrane transport model based on the extended Nernst-Planck equationto predict module performance at the system-level. Modeling results are validated with respect to syntheticseawater experiments reported in an earlier work. A preliminary module design is proposed, and parametricstudies are employed to investigate the effect of varying key system parameters and elucidate the tradeoffsavailable during design. The model has significant implications for low-pressure nanofiltration, as well ashollow fiber NF module design and operation.

scholarly journals Inflight Fluidic Fibre Printing Towards Array and 3D Optoelectronic and Sensing Architectures

2020 ◽  
Author(s):  
Andy Wang ◽  
Karim Ouarus ◽  
Alexandra L. Rutz ◽  
xia li ◽  
Magda Gerigk ◽  
...  
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
Small Diameter ◽  
Volume Ratio ◽  
Fibre Production ◽  
Single Step ◽  
Metallic Silver ◽  
Full Potential ◽  
Moisture Sensor ◽  
Conventional Film

<div>Scalability and device-integration have been prevailing issues limiting our ability in harnessing the full potential of small-diameter conducting fibres. We report inflight fluidic fibre printing, a rapid, low-cost route that integrates the entire process of conducting fibre production and fibre-to-circuit connection, in a single step under sub-100 °C ambient atmospheres. Metallic (silver) or organic (PEDOT:PSS) fibres with 1-3 μm diameter are fabricated, and the fibre arrays exhibit over 95 % transmittance in the 350-750 nm region. We exploit combinations of the unique fibre characteristics: directionality, high surface-area-to-volume ratio, and permissiveness, along with transparency and conductivity. Using PEDOT:PSS fibres as a cell-interfaced impedimetric</div><div>sensor and a moisture sensor, we show that even a single fibre component can achieve complex functions or outperform conventional film-based devices. The capability to design suspended fibres and networks of homo-, hetero- cross-junctions, paves the way to applications including</div><div>flow-permissive devices, and 3D optoelectronic and sensor architectures.</div>

High Surface and High Nanoporosity Boron Nitride Adapted to Hydrogen Sequestration

2007 ◽  
Vol 555 ◽  
pp. 355-362 ◽  
Author(s):  
L. Laversenne ◽  
Š. Miljanić ◽  
Philippe Miele ◽  
Christelle Goutaudier ◽  
B. Bonnetot
Keyword(s):  
Boron Nitride ◽  
Room Temperature ◽  
Storage Capacity ◽  
Hexagonal Boron Nitride ◽  
High Surface ◽  
High Surface Area ◽  
Specific Area ◽  
Nitrogen Atmosphere ◽  
Molecular Precursors ◽  
One Step

High surface area nanoporous powders of hexagonal boron nitride (h-BN) have been prepared from molecular precursors to be used for hydrogen sequestration. The more promising samples were obtained using a precursor derived from trichloroborazine (TCB). The precursor was first reacted with ammonia at room temperature leading to the molecular complex Cl3B3N3H3, 6 NH3 which was heated up to 650 °C under ammonia and then up to 1000 °C under nitrogen, giving rise to a high reactive h-BN powder. This crude powder was stabilised by an annealing up to 1800 °C under nitrogen atmosphere leading to a very stable compound exhibiting a specific area of more than 300 m2·g-1 and presenting a very specific nanometric spherical texture. Some samples were doped with platinum (about 1 wt.%) to enhance the activity of pure h-BN using an original one step synthesis route starting from a mixture of BN and Pt precursors. Attempts to sequester hydrogen into these powders were made successfully at -196 °C under 10 MPa, but the stored amount was only about 0.3 wt.% and the platinum added BN powders did not lead to an enhancement of the storage capacity.

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