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 gamma-alumina catalysed ozonation. As a result, gamma-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 gamma-alumina, and pH values of the solution can be linked together. When the pH value of the solution was near the pH(zpc). of gamma-Al2O3, there was observable activity in the catalysed ozonation process. R-ct, which denoted the relative concentration of hydroxyl radical ((OH)-O-.), was much higher in the catalysed ozonation process than in the ozonation process. This result further illuminated that gamma-Al2O3 can promote ozone decomposition to produce (OH)-O-.. Finally, the effect of r(p/l) on catalysed ozone decomposition and ozone decomposition was investigated.