Effects of morphology and crystallinity of MoS2 nanocrystals on the catalytic reduction of p-nitrophenol
- 75 Downloads
p-Nitrophenol (p-NP), a well-known organic pollutant in industrial and agricultural wastewater, is difficult to degrade. Therefore, an exploiting efficient and economical reductant is of great significance for environmental remediation and human health. Herein, MoS2 nanocrystals with different morphologies were successfully prepared by a simple hydrothermal method in the mixed solution of ethylenediamine and ethylene glycol. The morphology can be readily controlled by tuning the volume ratio of ethylenediamine to the solvent (R). Moreover, well-crystallized MoS2 nanocrystals were developed by the following heat treatment process. The as-prepared MoS2 nanocrystals were employed as catalysts for the reduction of toxic p-NP to industrially beneficial p-aminophenol (p-AP). It was clearly revealed that both the morphology and crystallinity play critical roles in the catalytic reduction efficiency. Among the MoS2 samples, the optimized R75 sample with a rough surface exhibits the highest rate constant of kapp = 0.3906 min−1 for the reduction of p-NP, while improved crystallinity will decrease the catalytic efficiency. These novel findings can promote the development of a new non-noble metal catalyst which can be used for wastewater reductive treatment.
KeywordsMoS2 p-Nitrophenol Nanostructured catalyst Hydrothermal method Crystallinity
The research was financially supported by the National Natural Science Foundation (No. 51502155).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Lang D, Shen T, Xiang Q (2015) Roles of MoS2 and graphene as cocatalysts in the enhanced visible-light photocatalytic H2 production activity of multiarmed CdS nanorods. Chem Cat Chem 7:943–951Google Scholar
- Liu P, Gu X, Kang K, Zhang H, Cheng J, Su H (2017) Highly efficient catalytic hydrogen evolution from ammonia borane using the synergistic effect of crystallinity and size of noble-metal-free nanoparticles supported by porous metal–organic frameworks. ACS Appl Mater Interfaces 9:10759–10767CrossRefGoogle Scholar
- Paredes JI, Munuera JM, Villar-Rodil S, Guardia L, Ayán-Varela M, Pagán A, Aznar-Cervantes DS, Cenis LJ, Martínez-Alonso M (2016) Impact of covalent functionalization on the aqueous processability, catalytic activity, and biocompatibility of chemically exfoliated MoS2 nanosheets. ACS Appl Mater Interfaces 8(41):27974–27986CrossRefGoogle Scholar
- Ye L, Wu C, Guo W, Xie Y (2006) MoS2 hierarchical hollow cubic cages assembled by bilayers: one-step synthesis and their electrochemical hydrogen storage properties. Chem Commun (Camb):4738–4740Google Scholar
- Zhang Z, Li Q, Qiao X, Hou D, Li D (2018) One-pot hydrothermal synthesis of willow branch-shaped MoS2/CdS heterojunctions for photocatalytic H2 production under visible light irradiation. Chinese J Catal. https://doi.org/10.1016/S1872-2067(18)63178-X