Study On Degradation Behavior Of Azo Dyes By Fe Based Amorphous Alloy

The environmental problems are becoming more and more serious,especiallyr the pollution of industrial wastewate.Some iron-based amorphous alloys was found to be used as zero-valent iron to degrade the azo dyes rapidly,which exhibited promising application in wastewater treatment.It is very attractive to the practical application of wastewater.Therefore,it is of great scientific significance and practical value to carry out related research.The effects of time,temperature and pH value on the degradation of methyl orange and direct blue 6 solution by Fe76Si9B10P5 amorphous powders were studied in this paper.The results showed that the Fe76Si9B10P5 amorphous powders exhibited excellent degrading performance of azo dye.The reaction rate constant of methyl orange and direct blue 6 were 5.2 and 2 times that of Fe powders,respectively.The calculated activation energies of methyl orange and direct blue 6 were 24.2 and 20.4 kJ/mol by Fe76Si9B10P5 amorphous powders.The high reaction efficiency can be retained in complex environments,such as solutions with different pH values.The dye degradation performance are sensitive to pH,with high degradation efficiencies in acidic solutions.The addition of graphene oxide after ultrasonic dispersion into Fe76Si9B10P5 amorphous powders further improve the degradation performance with the degradation efficiency over 99%with shortening degradation time.Activate energies of composites composed of Fe76Si9B10P5 amorphous powders and graphene oxide for the removal of MO and DB6 are 18.3 and 16.7 kJ mol-1,which are much lower than those of 21.3 and 18.6 kJ mol-1 by Fe76Si9B10P5 amorphous powders with graphene oxide without ultrasonic dispersion.The degradtion mechanism was also illustrated from the view of electrochemistry,the results of polarization curve showed that the electrochemical activity of Fe76Si9B10P5 amorphous powders with graphene oxide was the strongest.The analysis of cyclic voltammetry curves showed that the macromolecules of methyl orange and direct blue 6 were more easily adsorbed by Fe76Si9B10P5 amorphous powders with adding graphene oxide,which was beneficial to the degradation of azo dyes.