Influences of Inorganic Anions on Oxidation of Phenol by CuO-H2O2
无机阴离子对CuO-H2O2氧化苯酚废水的影响

Phenol was selected as a model pollution substrate. The influences and mechanism of inorganic anions on its oxidation were investigated in neutral solution at low temperature and atmospheric pressure. Results showed that phenol could be removed efficiently by CuO and H2O2 with 94.7% removal rate in 10min, which followed hydroxyl radical oxidation mechanism. Inorganic anions influenced the oxidation with different mechanisms. Higher concentration would lead to more significant influences. HCO-3 accelerated the inefficient decomposing of H2O2. The decomposing rate constants increased from 0.373 8 min-1 at concentration of 0 mmol·L-1 to 0.534 7 min-1 at concentration of 20 mmol·L-1. The TOC removal rate constants decreased from 0.267 min-1 to 0.019 4 min-1 correspondingly.HPO2-4 retarded the H2O2 decomposing and inhibited the phenol oxidation. The decomposing rate constants of H2O2 and the removal rate constants of TOC decreased from 0.373 8 min-1, 0.267 min-1 to 0.033 8 min-1, 0.033 8 min-1 respectively. Cl- was good at H2O2 decomposing and phenol removal with simultaneously increasing the H2O2 decomposing rate constants and the TOC removal rate constants from 0.373 8 min-1, 0.267 min-1 to 0.604 0 min-1, 0.387 9 min-1 respectively. NO-3 and SO2-4 had few influences on H2O2 decomposing and phenol removal.