Highly dispersed Mn₂O₃−Co₃O₄ nanostructures on carbon matrix as heterogeneous Fenton‐like catalyst

Abstract

This work reports the synthesis of various carbon (Vulcan XC‐72 R) supported metal oxide nanostructures, such as Mn2O3, Co3O4 and Mn2O3−Co3O4 as heterogeneous Fenton‐like catalysts for the degradation of organic dye pollutants, namely Rhodamine B (RB) and Congo Red (CR) in wastewater. The activity results showed that the bimetallic Mn2O3−Co3O4/C catalyst exhibits much higher activity than the monometallic Mn2O3/C and Co3O4/C catalysts for the degradation of both RB and CR pollutants, due to the synergistic properties induced by the Mn−Co and/or Mn (Co)−support interactions. The degradation efficiency of RB and CR was considerably increased with an increase of reaction temperature from 25 to 45°C. Importantly, the bimetallic Mn2O3−Co3O4/C catalyst could maintain its catalytic activity up to five successive cycles, revealing its catalytic durability for wastewater purification. The structure–activity correlations demonstrated a probable mechanism for the degradation of organic dye pollutants in wastewater, involving •OH radical as well as Mn2+/Mn3+ or Co2+/Co3+ redox couple of the Mn2O3−Co3O4/C catalyst.

Binary α‐Fe2O3–Co3O4 nanostructures for advanced oxidation process: Role of synergy for enhanced catalysis

“…With the increasing amount of catalyst dosage, the specific surface area and catalytically active site increases; as a result, the k app of MB increases. [ 38,46–48 ] It was observed that when the amount of catalyst used is 5 mg, the degradation completed within 40 min of the reaction.…”

A Review of Manganese(III) (Oxyhydr)Oxides Use in Advanced Oxidation Processes

“…The enhanced degradation of MB was attributed to the hampered electron-hole recombination due to the loading of Ag and graphene. Furthermore, the studies regarding the application of modified Mn 2 O 3 in oxidants (such as PMS, ) activation for contaminants removal were also reported [ 84 , 99 , 100 , 101 ]. For example, Saputra et al prepared an egg-shaped core/shell α-Mn 2 O 3 @α-MnO 2 catalyst via a hydrothermal process and investigated the catalytic activity of α-Mn 2 O 3 @α-MnO 2 in heterogeneous Oxone® activation for phenol degradation [ 84 ].…”

“…The amount of and was then increased leading to the enhanced degradation of phenol. The efficient degradation of organic dye pollutants (such as Rhodamine B (RhB) and Congo Red (CR)) by bimetallic Mn 2 O 3 -Co 3 O 4 /carbon catalyst activated Fenton-like reaction was also reported [ 100 ]. The superior reactivity of Mn 2 O 3 -Co 3 O 4 /C catalyst in activation for RB and CR degradation was attributed to the good synergistic effect between Co 3 O 4 and Mn 2 O 3 as well as the interaction between metal oxides and carbon.…”

Ultra-efficient catalytic degradation of malachite green dye wastewater by KMnO4-modified biochar (Mn/SRBC)

“… 25,26 At present, there are many studies on the degradation of organic contaminants by Mn/H 2 O 2 systems. 27–29 However, there are few reports on the use of Mn and biochar composites as carbon-based catalysts.…”