scholarly journals General molten-salt route to three-dimensional porous transition metal nitrides as sensitive and stable Raman substrates

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Haomin Guan ◽  
Wentao Li ◽  
Jing Han ◽  
Wencai Yi ◽  
Hua Bai ◽  
...  
Keyword(s):  
Transition Metal ◽  
Molten Salt ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
High Capacity ◽  
Hydrophobic Surface ◽  
Metal Nitrides ◽  
Transition Metal Nitrides ◽  
Key Factor

AbstractTransition metal nitrides have been widely studied due to their high electrical conductivity and excellent chemical stability. However, their preparation traditionally requires harsh conditions because of the ultrahigh activation energy barrier they need to cross in nucleation. Herein, we report three-dimensional porous VN, MoN, WN, and TiN with high surface area and porosity that are prepared by a general and mild molten-salt route. Trace water is found to be a key factor for the formation of these porous transition metal nitrides. The porous transition metal nitrides show hydrophobic surface and can adsorb a series of organic compounds with high capacity. Among them, the porous VN shows strong surface plasmon resonance, high conductivity, and a remarkable photothermal conversion efficiency. As a new type of corrosion- and radiation-resistant surface-enhanced Raman scattering substrate, the porous VN exhibits an ultrasensitive detection limit of 10−11 M for polychlorophenol.

scholarly journals Molten Salt-Directed Catalytic Synthesis of 2D Layered Transition-Metal Nitrides for Efficient Hydrogen Evolution

Chem ◽  
2020 ◽  
Vol 6 (9) ◽  
pp. 2382-2394 ◽  
Author(s):  
Huanyu Jin ◽  
Qinfen Gu ◽  
Bo Chen ◽  
Cheng Tang ◽  
Yao Zheng ◽  
...  
Keyword(s):  
Transition Metal ◽  
Molten Salt ◽  
Hydrogen Evolution ◽  
Catalytic Synthesis ◽  
Metal Nitrides ◽  
Transition Metal Nitrides ◽  
Layered Transition Metal

Intercalation of First Row Transition Metals inside Covalent-Organic Frameworks (COF): a Strategy to Fine Tune the Electronic Properties of Porous Crystalline Materials

2018 ◽  
Author(s):  
Srimanta Pakhira ◽  
Jose Mendoza-Cortes
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Electronic Properties ◽  
High Surface ◽  
Electronic Devices ◽  
High Surface Area ◽  
Main Role ◽  
Covalent Organic Frameworks ◽  
Porous Network ◽  
Crystalline Materials

<div>Covalent organic frameworks (COFs) have emerged as an important class of nano-porous crystalline materials with many potential applications. They are intriguing platforms for the design of porous skeletons with special functionality at the molecular level. However, despite their extraordinary properties, it is difficult to control their electronic properties, thus hindering the potential implementation in electronic devices. A new form of nanoporous material, COFs intercalated with first row transition metal is proposed to address this fundamental drawback - the lack of electronic tunability. Using first-principles calculations, we have designed 31 new COF materials <i>in-silico</i> by intercalating all of the first row transition metals (TMs) with boroxine-linked and triazine-linked COFs: COF-TM-x (where TM=Sc-Zn and x=3-5). This is a significant addition considering that only 187 experimentally COFs structures has been reported and characterized so far. We have investigated their structure and electronic properties. Specifically, we predict that COF's band gap and density of states (DOSs) can be controlled by intercalating first row transition metal atoms (TM: Sc - Zn) and fine tuned by the concentration of TMs. We also found that the $d$-subshell electron density of the TMs plays the main role in determining the electronic properties of the COFs. Thus intercalated-COFs provide a new strategy to control the electronic properties of materials within a porous network. This work opens up new avenues for the design of TM-intercalated materials with promising future applications in nanoporous electronic devices, where a high surface area coupled with fine-tuned electronic properties are desired.</div>

scholarly journals Synthesis of Silver-Impregnated Magnetite Mesoporous Silica Composites for Removing Iodide in Aqueous Solution

Toxics ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 175
Author(s):  
Sang-Eun Jo ◽  
Jung-Weon Choi ◽  
Sang-June Choi
Keyword(s):  
Aqueous Solution ◽  
Langmuir Isotherm ◽  
High Surface ◽  
High Surface Area ◽  
High Capacity ◽  
Maximum Adsorption Capacity ◽  
Initial Contact ◽  
Order Kinetic ◽  
Sorption Ability ◽  
High Sorption

Mag@silica-Ag composite has a high sorption ability for I− in aqueous solution due to its high surface area and strong affinity for the studied anion. The material adsorbed I− rapidly during the initial contact time (in 45 min, η = 80%) and reached adsorption equilibrium after 2 h. Moreover, mag@silica-Ag proved to selectively remove I− from a mixture of Cl−, NO3− and I−. The adsorption behavior fitted the Langmuir isotherm perfectly and the pseudo-second-order kinetic model. Based on the Langmuir isotherm, the maximum adsorption capacity of mag@silica-Ag was 0.82 mmol/g, which is significantly higher than previously developed adsorbents. This study introduces a practical application of a high-capacity adsorbent in removing radioactive I− from wastewaters.

Clustering of oxygen point defects in transition metal nitrides

2021 ◽  
Vol 129 (5) ◽  
pp. 055305
Author(s):  
Rajendra Kumar ◽  
Sanjay Nayak ◽  
Magnus Garbrecht ◽  
Vijay Bhatia ◽  
Ashalatha Indiradevi Kamalasanan Pillai ◽  
...  
Keyword(s):  
Transition Metal ◽  
Point Defects ◽  
Metal Nitrides ◽  
Transition Metal Nitrides

scholarly journals The role of nitrogen in transition-metal nitrides in electrochemical water splitting

2021 ◽  
Author(s):  
Rabia Jamil ◽  
Rashad Ali ◽  
Suraj Loomba ◽  
Jian Xian ◽  
Muhammad Yousaf ◽  
...  
Keyword(s):  
Transition Metal ◽  
Water Splitting ◽  
Metal Nitrides ◽  
Transition Metal Nitrides ◽  
Electrochemical Water Splitting
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