SUSTAINABLE ACTIVATION OF PERACETIC ACID WITH MoS2 FOR DEGRADATION OF ACIDIC ORANGE 7
Acidic orange 7(AO7)is a typical anionic azo dye,and has attracted widespread attention for its potential hazards to the environment and human health.In this study,molybdenum disulfide(MoS2)was used as an activator of peroxyacetic acid(PAA)for the degradation of AO7.The results indicated that the degradation efficiency of AO7 in the MoS2/PAA system was much higher than that in the MoS2/H2O2 system and MoS2/PI system.The degradation efficiency of AO7 reached 84.2％under the condition of ρ(MoS2)0=0.4 g/L,c(PAA)0=0.4 mmol/L,and initial pH=3.0.In addition,the MoS2/H2O2 system can efficiently degrade various pollutants such as MO,ACE,DCF,SMX,and TC.EPR and quenching experiments result indicated that·OH,R-O·,and 1O2 generated by the MoS2/PAA system were the main reactive oxygen species for AO7 degradation.UV full wavelength scanning revealed that the azo bonds and aromatic fragments(naphthalene and benzene rings)of AO7 were rapidly disrupted under the attack of active free radicals.Further investigation was conducted on the effects of initial pH,MoS2 dosage,PAA concentration,coexisting water matrix on AO7 degradation.In the co-existing water matrix experiment,Cl-,SO42-and HCO3-did not affect the removal of AO7,while humic acid(HA)inhibited it.In natural water bodies,the MoS2/PAA system still exhibits strong oxidation performance(up to 60％)towards AO7.Overall,this study provides new knowledge on the degradation of organic pollutants within the MoS2/PAA system.
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