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The degradation of dimethyl phthalate (DMP), which is a pollutant of concern in the water environment, was carried out by catalytic ozonation with N-methyl hydroxylamine (N-HA) at different pH. The process and mechanism were investigated for the removal of DMP and ozone (O 3 ) under various experimental conditions including pH, N-HA dosage, and with or without tert-butyl alcohol (TBA). The results indicated that the removal of DMP was more efficient in the O 3 /N-HA system than sole O 3 , and the efficiency improved with increasing N-HA dosage. The levels of N-HA protonation were 99.89%, 8.36%, and 0.06% at pH 3.0, 7.0, and 9.2. Protonated N-HA (N-CH 3 NH 2 OH + ) enhanced the degradation of DMP from 6.93% to 100% at pH 3.0, and it decreased when pH was raised to 7.0 and 9.2 because of the lower level of N-HA protonation. The results of adding TBA confirmed that hydroxyl radicals (•OH) were the main active species involved in the removal of DMP during the ozonation process.

Ozonation of dimethyl phthalate in water activated by N-methyl hydroxylamine