A novel Fe/Mo co-catalyzed graphene-based nanocomposite to activate peroxymonosulfate for highly efficient degradation of organic pollutants

Environ Res. 2022 Dec;215(Pt 1):114233. doi: 10.1016/j.envres.2022.114233. Epub 2022 Sep 2.

Abstract

A novel 3D α-FeOOH@MoS2/rGO nanocomposite was successfully fabricated by a simple in situ hydrothermal method. It is a highly efficient heterogeneous catalyst in activation of peroxymonosulfate (PMS) for rapid degradation of rhodamine B (RhB), with 99.9% of RhB removed within 20 min. The introduction of rGO contributes to uniform dispersion and sufficient contact of α-FeOOH and MoS2 nanosheets. Highly active Mo(IV) enhances the reduction of Fe(III), improves Fe(III)/Fe(II) conversion and promotes the generation of O21, which ensures an improved catalytic activity. MoS2/rGO hybrid can effectively solve the problem of material reunion and make α-FeOOH exhibit excellent catalytic performance. The α-FeOOH@MoS2-rGO/PMS system is a co-catalytic system based on the active components of α-FeOOH and MoS2. The main reactive oxygen species in the α-FeOOH@MoS2-rGO/PMS system are O21, SO4.- and ⋅O2-, which contribute to a high reactivity over a wide range of pH (5-9). Besides, this system is highly resistant to anions (Cl-, SO42-) and natural organic matter (humic acid), and can be widely used for degradation of common organic pollutants. The α-FeOOH@MoS2/rGO is a promising Fenton-like catalyst for refractory organic wastewater treatment.

Keywords: Co-catalytic; Fenton-like; Peroxymonosulfate; α-FeOOH@MoS(2)/rGO.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Environmental Pollutants*
  • Ferrous Compounds
  • Graphite*
  • Humic Substances
  • Iron
  • Iron Compounds
  • Minerals
  • Molybdenum
  • Nanocomposites*
  • Peroxides
  • Reactive Oxygen Species

Substances

  • Environmental Pollutants
  • Ferrous Compounds
  • Humic Substances
  • Iron Compounds
  • Minerals
  • Peroxides
  • Reactive Oxygen Species
  • graphene oxide
  • goethite
  • peroxymonosulfate
  • Graphite
  • Molybdenum
  • Iron