3D Hierarchical N, O Co–Doped MoS₂/NiO Hollow Microspheres as Reusable Catalyst for Nitrophenols Reduction

Abstract

The exploitation of efficient noble metal free catalyst for nitrophenols is of great importance. Herein, 3D hierarchical N, O‐MoS2/NiO hollow microspheres have been successfully prepared via a facile hydrothermal method. Characterizations reveal that the as‐obtained hollow microspheres were assembled by amorphous N, O co‐doped MoS2 and NiO nanosheets. Catalytic experiments show that the hollow microspheres displayed remarkably enhanced catalytic activity for 2, 3, 4‐nitrophenol reduction with the kapp reaching 1.72 min−1 for 4‐nitrophenol, among the best reported non‐noble metal catalysts. The greatly enhanced catalytic activity is attributed to the synergistic effects of abundant exposed catalytic edge sites, intimate P−N heterojunction between NiO and N, O‐MoS2, as well as the hollow porous structure. Moreover, the recovered N, O‐MoS2/NiO hollow microspheres can be reused in successive 8 cycles without much losing its activity. These results suggest that the novel N, O‐MoS2/NiO hollow microspheres had significant application potential for wastewater treatment.

Amorphous CoMoS4 Nanostructure for Photocatalytic H2 Generation, Nitrophenol Reduction, and Methylene Blue Adsorption

“…6 Some reports have proven that the incorporation of a foreign metal element such as Co or Ni into MoS 2 could greatly promote its catalytic performance. 7 Inspired by these issues, introducing a Co atom into the MoS 2 crystal structure yielding ternary TMDs is of great importance in boosting the catalytic activity. Hitherto, ternary TMDs have gradually become a research hotspot for their abundant controllable variables and exotic properties.…”

“…As shown in Figure 1b, the weak E 1 2g signal at 370 cm −1 (in plane) and A 1g signal at 400 cm −1 (out of plane) correspond to the S vibration in 2H-MoS 2 . 7,34 The Raman peaks at 144, 236, and 335 cm −1 are identified as the J1, J2, and J3 vibrational modes of 1T-MoS 2 , 35 which are caused by superlattice distortion in the basal plane. 36 The peaks at 281 and 361 cm −1 can be assigned to the E g and A g vibrations for Co−S.…”

“…Therefore, MoS 2 nanostructures have shown promising prospects in photo/electrocatalysis . Some reports have proven that the incorporation of a foreign metal element such as Co or Ni into MoS 2 could greatly promote its catalytic performance . Inspired by these issues, introducing a Co atom into the MoS 2 crystal structure yielding ternary TMDs is of great importance in boosting the catalytic activity.…”