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Acetic acid (HAc), a hydroxyl radical probe in ozonation, was chosen as a target contaminant to be degraded in strong acidic solution by different ozone-based processes. The highest removal rate of HAc was obtained by SZF/H 2 O 2 /O 3 . The indirect method of dimethyl sulfoxide (DMSO) capture showed that hydroxyl radical was effectively produced in this process. A mechanism study indicated that the S–Fe(III) peroxo complex intermediate played an important role in the process. The effects of different parameters such as pH value, amount of catalyst, concentration of H 2 O 2, and rate of ozone input were investigated. The experimental results showed that the presence of SO 2 –4 /ZrO 2 –Fe 2 O 3, abbreviated as SZF, could greatly improve the oxidative efficiency of H 2 O 2 /O 3 in the pH range from 0 to 5.0. The result is very significant to the application of H 2 O 2 /O 3 in strong acid wastewater pretreatment.
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Wang et al. (2016) studied this question.
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