title: Heterogeneous activation of Oxone by Co(x)Fe(3-x)O4 nanocatalysts for degradation of rhodamine B.
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.
authors.affiliation: College of Resources and Environment, University of Jinan, Jinan 250022, China.
authors.forename: Shengnan
authors.initials: S
authors.lastname: Su
authors.forename: Weilin
authors.initials: W
authors.lastname: Guo
authors.forename: Yanqiu
authors.initials: Y
authors.lastname: Leng
authors.forename: Chunliang
authors.initials: C
authors.lastname: Yi
authors.forename: Zhenmin
authors.initials: Z
authors.lastname: Ma
mesh_terms: D057919:Biological Oxygen Demand Analysis; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D058085:Iron Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry*; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D058085:Iron Compounds; D012235:Rhodamines; D013464:Sulfuric Acids; D014874:Water Pollutants, Chemical; D003035:Cobalt; C048813:potassium peroxymonosulfuric acid; C029773:rhodamine B