Heterogeneous activation of Oxone by Co(x)Fe(3-x)O4 nanocatalysts for degradation of rhodamine B

J Hazard Mater. 2013 Jan 15;244-245:736-42. doi: 10.1016/j.jhazmat.2012.11.005. Epub 2012 Nov 9.

Abstract

The removal of Rhodamine B (RhB) by Co(x)Fe(3-x)O(4) magnetic nanoparticles activated Oxone has been performed in this study. A series of Co(x)Fe(3-x)O(4) nanoparticles was synthesized using a hydrothermal method. The synthetic Co(x)Fe(3-x)O(4) nanoparticles were characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that they were spinel structures and Co was introduced into their structures. The performances of Co(x)Fe(3-x)O(4) nanocatalysts on the activation of Oxone for removal of RhB were investigated and we found that the higher cobalt content in the catalyst, the better removal performance was resulted. A series experiments of reaction conditions were also performed, which confirmed that weak acidic, higher temperature, higher dosages of Co(x)Fe(3-x)O(4) nanocatalyst and Oxone and lower concentration of RhB were favored for the degradation of RhB. The pseudo-first order kinetics was observed to fit the Co(x)Fe(3-x)O(4)/Oxone process. Furthermore, the reaction mechanism was discussed and the scavenging effect was examined by using phenol and tert-butyl alcohol which indicated that sulfate radicals were the dominating reactive species responsible for the degradation process. Finally, the stability of Co(x)Fe(3-x)O(4) nanocatalyst was studied.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biological Oxygen Demand Analysis
  • Catalysis
  • Cobalt / chemistry*
  • Coloring Agents / chemistry
  • Hydrogen-Ion Concentration
  • Iron Compounds / chemistry*
  • Metal Nanoparticles / chemistry*
  • Rhodamines / chemistry*
  • Sulfuric Acids / chemistry*
  • Temperature
  • Waste Disposal, Fluid / methods
  • Water Pollutants, Chemical / chemistry*

Substances

  • Coloring Agents
  • Iron Compounds
  • Rhodamines
  • Sulfuric Acids
  • Water Pollutants, Chemical
  • Cobalt
  • potassium peroxymonosulfuric acid
  • rhodamine B