Three-Dimensional Electro-Fenton Degradation of Methyleneblue Based on the Composite Particle Electrodes of Carbon Nanotubes and Nano-Fe3O4

Carbon nanotubes/magnetic nano-Fe3O4 composite (CNTs/Fe(3)O(4)NPs) were prepared by chemical co-precipitation. Ti/SnO(2)electrode was used as the anode, the CNTs/Fe3O4 composite as particle electrodes, and graphite electrode as cathode respectively. Four different systems for degradation of methylene blue (MB) in neutral medium were investigated: Ti/SnO2 anode (A), Ti/SnO2 anode with CNTs particle electrodes (B), Ti/SnO(2)anode with Fe(3)O(4)NPs particle electrodes (C), and Ti/SnO(2)anode with CNTs/Fe(3)O(4)NPs particle electrodes (D). It was found that D system exhibited much higher MB degradation efficiency than others, attaining 82 % in 30 min. The enhanced efficiency was attributed to Ti/SnO2 anodic direct oxidation of MB and CNTs/Fe3O4 NPs composite particle electrodes which could activate molecule oxygen to produce more H2O2 and center dot OH. CNTs/Fe3O4 NPs particle electrodes could achieve magnetic separation easily for reuse and exhibited good degradation efficiency to MB.