Chitin‐Derived Mesoporous, Nitrogen‐Containing Carbon for Heavy‐Metal Removal and Styrene Epoxidation

Gao, Yongjun; Chen, Xi; Zhang, Jiaguang; Yan, Ning

doi:10.1002/cplu.201500293

Cited by 97 publications

(79 citation statements)

References 65 publications

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“…In typical low-energy configurations, the M cation is located near the center, binding with nearest neighboring N atoms in the same plane, while the two halogen anions are aligned vertically, as shown in Figure 1b. Previous studies [29,30] have shown that heavy cations like Pb 2+ can be adsorbed from aqueous solution by carbon nitrides. Taking NiCl 2 (C 2 N) 6 (with ΔE = −0.15 eV per f.u.)…”

Section: Methodsmentioning

confidence: 99%

Facile and Versatile Functionalization of Two‐Dimensional Carbon Nitrides by Design: Magnetism/Multiferroicity, Valleytronics, and Photovoltaics

Zeng

2019

Adv Funct Materials

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Ab initio calculation evidence has shown that two-dimensional (2D) carbon nitrides may enable "facile functionalization" when a domain of carbon nitride is wetted by a solution of metal halides with mobile cations/anions. During the wetting process, each cavity can be functionalized by a unit of metal halide. Compared with prevailing functionalization or doping strategies through either high-temperature diffusion of source ions or ion implantation by using accelerators, such a room-temperature "wet-lab" functionalization approach is more facile and efficient. The wet-lab functionalization not only can facilitate isolation of the 2D monolayer, but also, with applying different metal halides, enable various new and desirable properties for broad applications, e.g., 2D magnetism and 2D ferroelectricity with high piezoelectric coefficient. The latter can be implemented in spin-independent valleytronics for non-volatile electrical manipulations. Notably, tunable bandgaps, ranging from 1.0 to 2.5 eV, can be realized by controlling the metal-halide functionalization density, while the separation of electrons/holes can be facilitated by the ferroelectric polarizations and heterostructure band alignments. Moreover, multifunctional domains like P/N doped or magnetic/ ferroelectric domains can be selectively constructed through such solutionprocessed functionalization with different halides, followed by seamless integration into a single sheet of carbon nitride, akin to the P/N channels in silicon wafers.

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Section: Methodsmentioning

confidence: 99%

Facile and Versatile Functionalization of Two‐Dimensional Carbon Nitrides by Design: Magnetism/Multiferroicity, Valleytronics, and Photovoltaics

Zeng

2019

Adv Funct Materials

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“…The N 1s spectrum is composed of four peaks at 398.7 AE 0.3, 400.3 AE 0.2, 401.4 AE 0.3, and 403 AE 0.3 eV, which are assigned to pyridinic nitrogen (N-6), pyrrolic nitrogen (N-5), quaternary nitrogen (N-Q), and pyridine-N-oxide (N-X), respectively. [37][38][39][40][41][42] The percent contributions of surface nitrogen species are summarized in Table 4, and the dominant nitrogen species on the surface of nitrogen-doped activated carbons are pyridinic nitrogens. Nitric acid oxidation leads to higher relative contents of pyridine-N-oxide and less pyrrolic nitrogen.…”

Section: -35mentioning

confidence: 99%

High-performance removal of methyl mercaptan by nitrogen-rich coconut shell activated carbon

Liu

et al. 2017

RSC Adv.

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A series of nitrogen-doped coconut shell activated carbon catalysts were prepared by urea or melamine impregnation followed by heat treatment and used for the removal of methyl mercaptan (CH 3 SH). The physical and chemical properties of the nitrogen-doped coconut shell activated carbons were evaluated by nitrogen adsorption/desorption, scanning electron microscopy, X-ray photoelectron spectroscopy, elemental analysis, Boehm titration, and thermal analysis. The results show that CH 3 SH capacity depends on the nitrogen content. Further research indicates that pyridinic nitrogen and quaternary nitrogen are the active sites. Due to the metal-free property of the nitrogen-rich coconut shell activated carbon, the regeneration process can be easily performed and dimethyl disulfide (CH 3 SSCH 3 ) can be recovered as the main product. Our study indicates that there is a promising prospect for nitrogen-rich coconut shell activated carbon for CH 3 SH removal because of its high capacity, mild conditions, and easy regeneration.

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“…Moreover, a series of chitin‐derived mesoporous N‐containing carbon materials obtained under template‐free conditions also exhibited excellent catalytic activity in the epoxidation of styrene. High temperature enriched such materials with graphitic N . Besides above, Garcia et al.…”

Section: Oxidationmentioning

confidence: 92%

Heteroatom‐Enhanced Metal‐Free Catalytic Performance of Carbocatalysts for Organic Transformations

Shang

Gao

2019

ChemCatChem

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The exploitation and design of metal‐free catalysts for chemical transformation is always a fascinating theme from the prospective of fundamental and applied research. In addition to their distinct advantages such as lower cost, higher biocompatibility and reliability and thus higher sustainability, metal‐free materials often unexpectedly render different reaction pathway or mechanism from conventional metal catalysts. As a consequence, metal‐free catalysts have revolutionized and expanded the platform of catalysis. Among them, carbons are a typical class of nonmetallic materials. To date, a series of elements (e. g., B, N, P or S) as heteroatom dopants have equipped pristine carbons with enhanced performance and even new chemical functionality. It was proposed to attribute to modulated electrical properties and surface physicochemical features originated from structural distortions and changes of charge densities. In this minireview, we overviewed the catalytic application of heteroatom‐doped carbocatalysts in oxidation, oxidative coupling, reduction and hydrogenation reactions with special emphasis on the role of heteroatoms and consequently enhanced performance. This minireview highlights the structure‐activity correlations, thereby directing the rational design of advanced metal‐free catalysts for organic synthesis. Some controversies about active sites and challenges in catalyst design are also discussed here.

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Chitin‐Derived Mesoporous, Nitrogen‐Containing Carbon for Heavy‐Metal Removal and Styrene Epoxidation

Cited by 97 publications

References 65 publications

Facile and Versatile Functionalization of Two‐Dimensional Carbon Nitrides by Design: Magnetism/Multiferroicity, Valleytronics, and Photovoltaics

Facile and Versatile Functionalization of Two‐Dimensional Carbon Nitrides by Design: Magnetism/Multiferroicity, Valleytronics, and Photovoltaics

High-performance removal of methyl mercaptan by nitrogen-rich coconut shell activated carbon

Heteroatom‐Enhanced Metal‐Free Catalytic Performance of Carbocatalysts for Organic Transformations

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