Facile Preparation of Magnetic Nitrogen‐Doped Carbon Microtubes with Co Nanoparticles for Reduction of 4‐Nitrophenol

Abstract

Heterogeneous catalysts with controllable interface structures are of great importance to demonstrate the relationship between structure and property. Herein, magnetic Nitrogen‐doped carbon microtubes with Co nanoparticles (Fe3O4@C−Co) were prepared, which could be used for the reduction of 4‐nitrophenol(4‐NP). In the process, MoO3@FeOOH core‐shell structure was fabricated, then ZIF‐67 was decorated on the MoO3@FeOOH. After adding 2‐methylimidazole, MoO3 microrods were removed. Then the prepared FeOOH@ZIF‐67 microtubes are converted to Fe3O4@C−Co hybrid microtubes through pyrolysis. Due to the unique structures, the obtained Fe3O4@C−Co composites improved the dispersion of Co nanoparticles (NPs), diminished Co leaching, and promoted catalytic activity. The plentiful nitrogen improved electronic conductivity and brought additional active sites. The resulting Fe3O4@C−Co implies outstanding catalytic ability towards the reduction of 4‐NP. The synergistic effect between the hollow microtube and the fine dispersed Co NPs within Fe3O4@C−Co offered an excellent catalytic efficiency. More particularly, this achievement opens a new avenue to the targeted design of well‐defined nanocatalysts for practical applications in environmental remediation.

Co, Fe Dual-Doped MoS2 Nanosheets on Polypyrrole Microtubes as Effective Peroxidase Mimics for Glutathione Sensing

“…05-0508), respectively. 22 FeOOH was uniformly covered on the surface of MoO 3 as illustrated with the rough and bristle-like surface morphology around 70 nm in Figure 1C,H. The XRD of MoO 3 @FeOOH shown in Figure S1Ba was similar to that of MoO 3 with the reduced diffraction peaks of MoO 3 because of the presence of FeOOH, which existed in an amorphous form and did not change the crystal characteristics of MoO 3 .…”

“…Figure S1A shows that all diffraction peaks were observed at 2.7, 23.3, 25.7, 27.3, 38.9, 58.8, and 67.5°, which is consistent with the (020), (110), (040), (021), (060), (081), and (0100) lattice planes for orthorhombic α-MoO 3 (JCPDS card no. 05-0508), respectively . FeOOH was uniformly covered on the surface of MoO 3 as illustrated with the rough and bristle-like surface morphology around 70 nm in Figure C,H.…”

Fabrication of shish-kebab structure of MnO2@Co3O4 with remarkably enhanced oxidase-mimicking activity for the detection of l-cysteine

“…6 After calcination, MOF-derived materials can effectively avoid self-agglomeration, endowing them innumerable reaction sites and high porosity. 7 In particular, Co 3 O 4 nanocomposites derived from ZIF-67 exhibited excellent catalytic activity, batch preparation, and good stability. 8 Moreover, the performance of Co 3 O 4 was obviously improved by the formation of hybrid nanocomposites with tunable electronic structures, showing enhanced catalytic activity.…”