Ozone enhanced activity of aqueous titanium dioxide suspensions for photodegradation of 4-Chloronitrobenzene (cas 100-00-5)

Add time:07/24/2019    Source:sciencedirect.com

The TiO2/UV/O3 process has been employed to remove 4-chloronitrobenzene (4-CNB) and compared to UV/air, O3, TiO2/O3, TiO2/UV/O2 and UV/O3 five parallel oxidation pathways. The reaction activities of these six processes were tested in aqueous using electron paramagnetic resonance (EPR) spin trapping technique with 5,5-dimethyl-1-pyrroline N-oxide (DMPO) spin trap. Moreover, the effects of ozone dosage, catalyst dosage and initial solution pH on the degradation of 4-CNB by TiO2/UV/O3 process were also investigated. Results showed that the TiO2/UV/O3 is the most efficient process for complete mineralization of 4-CNB since the combination of photocatalytic oxidation with ozone has a synergistic effect. The relative intensity of DMPO-OH follows the order of UV/air < O3 < TiO2/O3 < UV/O3 < TiO2/UV/O2 < TiO2/UV/O3. In TiO2/UV/O3 process, the ozone and catalyst dosage are found to have a significant impact on the process efficiency whereas initial pH has relatively less effect. Chlorine atoms of 4-CNB are absolutely oxidized to chloride anions when the ozone dosage in the range of 5–18 mg/min, or the catalyst dosage ranging from 1.0 to 2.0 g/L. Part of chloride anions would be further oxidized to chlorate(V) ions if the ozone dosage exceeds 24 mg/min, or the catalyst dosage exceeds 2.0 g/L.

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