The efficiency and mechanism of γ-alumina catalytic ozonation of 2-methylisoborneol in drinking water

The efficiency and mechanism in degradation of 2-methylisoborneol (MIB) as a taste and odour compound in drinking water were studied under the condition where γ-alumina catalysed ozonation. As a result, γ-alumina can show distinct activity in enhancing the efficiency of ozonation of MIB. Tert-butyl alcohol had a remarkable effect on the removal efficiency of catalytic ozonation of MIB. The surface charge status, surface hydroxyl group status of γ-alumina, and pH values of the solution can be linked together. When the pH value of the solution was near the pH_zpc of γ-Al₂O₃, there was observable activity in the catalysed ozonation process. R_ct, which denoted the relative concentration of hydroxyl radical (·OH), was much higher in the catalysed ozonation process than in the ozonation process. This result further illuminated that γ-Al₂O₃ can promote ozone decomposition to produce ·OH. Finally, the effect of r_P/I on catalysed ozone decomposition and ozone decomposition was investigated.