Significantly enhanced degradation of organic dyes by Cu(Ⅱ)activated peracetic acid with hydroxylamine
The degradation of methylene blue(MB)was enhanced by using hydroxylamine hydrochloride(HA)to activate peracetic acid(PAA)in the presence of Cu(Ⅱ).The effects of initial solution pH,reactant dosages,common anions and natural organic matter in the water environment on the MB removal efficiency in the HA/Cu(Ⅱ)/PAA system were investigated.The activation mechanism of PAA in the HA/Cu(Ⅱ)/PAA system was explored by identifying the main active species in the system.In the experiments,400μmol/L HA was added into 200µmol/L Cu(Ⅱ)and PAA system under pH 7.0.The results showed that the MB removal rate was increased from 14.7％to 74.1％,and the degradation rate increased from 0.0047 to 0.2271min 1 after 30 minutes of reaction.The introduction of HA promoted the conversion of Cu(Ⅱ)to Cu(Ⅰ),which facilitated the catalytic decomposition of PAA,leading to the generation of more reactive species in the system.Based on the results of radical quenching experiments,hydroxyl radicals(HO·)were found to dominate the oxidative degradation of MB.The degradation of MB was significantly affected by the solution pH.The neutral and slightly alkaline conditions were more favorable for the degradation of MB in the HA/Cu(Ⅱ)/PAA system.The coexistence of Cl-and HCO3-inhibited the degradation of MB,while the natural organic matters had a certain promoting effect on the degradation of MB.
peracetic acidCu(Ⅱ)hydroxylamineadvanced oxidationmethylene blue
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