Activation of Peroxymonosulfate by Co-Ni-Mo Sulfides/CNT for Organic Pollutant Degradation

• Published in: Molecules (Basel, Switzerland) Vol. 29; no. 15; p. 3633
• Main Authors: You, Shihao, Di, Jing, Zhang, Tao, Chen, Yufeng, Yang, Ruiqin, Gao, Yesong, Li, Yin, Gai, Xikun
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01-08-2024
• Subjects: advanced oxidation process; composite materials; Efficiency; Energy consumption; Environmental impact; heterogeneous catalysts; Hydrogen; metal sulfide; Nanoparticles; Oxidation; Pollutants; radical; Satellites; Scanning electron microscopy; Spectrum analysis; Sulfides; Tetracycline; Tetracyclines; Wastewater; China; heterogeneous catalysts; metal sulfide; radical; advanced oxidation process; composite materials
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules29153633

To explore advanced oxidation catalysts, peroxymonosulfate (PMS) activation by Co-Ni-Mo/carbon nanotube (CNT) composite catalysts was investigated. A compound of NiCo
S
, MoS
, and CNTs was successfully prepared using a simple one-pot hydrothermal method. The results revealed that the activation of PMS by Co-Ni-Mo/CNT yielded an exceptional Rhodamine B decolorization efficiency of 99% within 20 min for the Rhodamine B solution. The degradation rate of Co-Ni-Mo/CNT was 4.5 times higher than that of Ni-Mo/CNT or Co-Mo/CNT, and 1.9 times as much than that of Co-Ni/CNT. Additionally, radical quenching experiments revealed that the principal active groups were
O
, surface-bound SO
, and •OH radicals. Furthermore, the catalyst exhibited low metal ion leaching and favorable stability. Mechanism studies revealed that Mo
on the surface of MoS
participated in the oxidation of PMS and the transformation of Co
/Co
and Ni
/Ni
. The synergism between MoS
and NiCo
S
reduces the charge transfer resistance between the catalyst and solution interface, thus accelerating the reaction rate. Interconnected structures composed of metal sulfides and CNTs can also enhance the electron transfer process and afford sufficient active reaction sites. Our work provides a further understanding of the design of multi-metal sulfides for wastewater treatment.