Cyclodextrin‐based Mesoporous N‐Doped Carbon Hybrids with High Heterocatalytic Activity

Abstract

Ac onvenient approach for the construction of nitrogen-doped mesoporous carbon material from native cyclic oligosaccharide b-cyclodextrin and N-containing small molecules was established. The resultant N-doped carbon hybrids, which possessed high Brunauer-EmmettTe ller (BET) surface area as well as appropriate pore volumes and pore diameters, could serve as highly efficient metal-free heterocatalysts with very good catalytic activity as well as generality and couldb ee asily recovered without any compromise of catalytic performance.Functional mesoporous carbon materials have attracted much attentioni nr ecent years and are widely employed for energy storage, separation technologies, ande lectrochemistry owing to their large specific surface areas, adjustable pore size, excellent stabilitya nd conductivity.[1] However, as an efficient catalyst, appropriate and sufficienta ctive sites are also required in addition to these outstanding features.[2] Therefore, heteroatoms, especially nitrogen atoms, were incorporated into the carbon matrix to improve the catalytic performance of active sites or to directly serve as active sites for corresponding reactions.[3] Recently,n itrogen-doped carbon materials were widely reported as supports for metals or their oxides in variousr eactions including oxidation, [4] dehydrogenation, [5] hydrogenation, [6] hydrochlorination, [7] Fischer-Tropschs ynthesis, [8] andt he decomposition of toxic chemicals, [9] and the incorporation of nitrogen atoms significantly enhanced the catalytic activity of these metalso rt heir oxides. However,t he high price and the possible contamination of metal catalysts greatly limited their applications. Therefore, metal-free catalysis is undoubtedly regarded asa ne ffective method to solve the above-mentioned problems.[10] For example, Arai et al. [11] prepared various activated carbonsc ontaining nitrogen for the aerobic oxidationo fa lcohols. Similarly,t he oxygen reduction reactionc ould also be carriedo ut by using nitrogen-doped carbon materials.[12] Ma et al. [13] and Song et al. [14] reported nitrogen-incorporated carbon materials for the selective oxidation of ethylbenzene to acetophenone. Moreover,B ao et al. [15] used an itrogen-incorporated carbon as as ubstitute for mercury in the catalytic hydrochlorination of acetylene. Clearly,t he design and fabrication of nitrogen-doped carbon material for the synthesis of some important chemical intermediates was meaningful.Herein, we consciously employed b-cyclodextrin (b-CD), ak ind of cyclic oligosaccharide composed of seven d-glucopyranoside units, and N-containing small molecules, that is, melamine, dicyandiamide, and guanidines ulfamate, to construct as eries of novel nitrogen-doped mesoporousc arbon materials that possess high Brunauer-Emmett-Teller (BET) surface area (494.6-1307.2 m 2 g À1 )a sw ell as appropriate pore volumes (0.43-2.36 cm 3 g À1 )a nd pore diameters (3.45-7.22 nm). Significantly,t he selected material exhibited av ery good catalytic performance for the hydrogenati...

Interfacially Polymerized β‐Cyclodextrin Film for Rapid Removal of Organic Dyes

“…[18,[20][21][22][23] It is difficult for further modifications of these films. [24] As shown in Figure 1, we consciously employed 𝛽-CD that is cheap and nontoxic macrocyclic oligosaccharide, [25] and N-containing 3D molecule TCT, to construct a novel cyclodextrin-based TCT-CDP film (Figure 1a). We report here a simply and practical strategy to fabricate a free-standing and close-packed TCT-CDP film, which formed at the liquid-liquid interface between water and acetonitrile at 25 °C.…”