Tailoring the structure and energy level over transition-metal doped MoS2 towards enhancing 4-nitrophenol reduction reaction

• Published in: Journal of environmental chemical engineering Vol. 9; no. 2; p. 105101
• Main Authors: Ni, Shan, Yang, Liangrong, Qu, Hongnan, Zhu, Xiangyang, Xu, Zihao, Yuan, Menglei, Xing, Huifang, Wang, Li, Yu, Jiemiao, Liu, Huizhou
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2021
• Subjects: 4-Nitrophenol; Energy level; Expanded interlayer spacing; Reduction; Transition-metal doped MoS2; Reduction; 4-Nitrophenol; Expanded interlayer spacing; Energy level; Transition-metal doped MoS2
• ISSN: 2213-3437; 2213-3437
• DOI: 10.1016/j.jece.2021.105101

Exploring high-efficiency, robust and cost-effective catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) is greatly desirable. Herein, a series of transition-metal doped MoS2 (M-MoS2, M = Mn, Fe, Co, Ni, Cu, Zn) with expanded interlayer spacing are fabricated by one-step solvothermal strategy. Notably, nickel doped molybdenum disulfide (Ni-MoS2) is found to exhibit prominent catalytic activity with an apparent rate constant (K) of 1.09 min-1 and excellent stability over six continuous runs of recycling experiments. The results demonstrate that the expanded interlayer spacing (0.94 nm) can increase the active sites of reactant absorption, and Ni dopants can lower the energy level (d‐band center) to facilitate the desorption of H. Thus, the catalytic activity of Ni-MoS2 is enhanced by synergistically structural and energy level modulation. This study offers an effective strategy to design transition metal sulfides with higher catalytic reactivity for the environment-related catalysis processes. [Display omitted] •Transition-metal doped MoS2 with expanded interlayer spacing have been fabricated by a facile solvothermal strategy.•The synergistic effect of structure and energy level modulation for enhancing catalytic activity.•The Ni-MoS2 exhibited excellent activity and stability for the catalytic reduction of 4-nitrophenol.