CATALYTIC OZONATION OF O-CHLOROPHENOL WITH MnO<sub><i>x</i></sub>/GAC SYNTHESIZED VIA ACID-THERMAL OXIDATION MODIFICATION METHOD

CHI Tong-tong; XU Ran-yun; LI Fei-fei; CHEN Lv-jun

doi:10.13205/j.hjgc.202111015

Volume 39 Issue 11

Jan. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(11): 119-126

CHI Tong-tong, XU Ran-yun, LI Fei-fei, CHEN Lv-jun. CATALYTIC OZONATION OF O-CHLOROPHENOL WITH MnOx/GAC SYNTHESIZED VIA ACID-THERMAL OXIDATION MODIFICATION METHOD[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(11): 119-126. doi: 10.13205/j.hjgc.202111015

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CHI Tong-tong, XU Ran-yun, LI Fei-fei, CHEN Lv-jun. CATALYTIC OZONATION OF O-CHLOROPHENOL WITH MnO_x/GAC SYNTHESIZED VIA ACID-THERMAL OXIDATION MODIFICATION METHOD[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(11): 119-126. doi: 10.13205/j.hjgc.202111015

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CATALYTIC OZONATION OF O-CHLOROPHENOL WITH MnO_x/GAC SYNTHESIZED VIA ACID-THERMAL OXIDATION MODIFICATION METHOD

doi: 10.13205/j.hjgc.202111015

School of Environment, Tsinghua University, Beijing 100084, China

Received Date: 2021-07-02
Available Online: 2022-01-26

Abstract

Abstract

MnO_x/GAC catalyst was prepared by acid-thermal oxidation modification method loading manganese oxide on activated carbon, and the performance of its catalytic oxidation degrading o-chlorophenol was studied. Results showed that when the catalyst dosage was 0.1 g/L, the ozone concentration was 20 mg/L, the gas flow was 0.5 L/min, and the initial pH was 6, the TOC removal rate of o-chlorophenol reached 95% after 120 min, which was 55% higher than ozonation alone. The reaction rate and TOC removal rate was greater when increasing ozone concentration and gas flow within a certain range, since excessive ozone might lower the TOC removal rate. Effects of different ions on TOC removal rate was studied. No significant difference was noticed on TOC removal rate with the addition of 1 mmol/L NO₃^-, SO₄^2-, Cl^-, separately. TOC removal was decreased 10% with the addition of 1 mmol/L Br^-. pH was an important factor affecting the oxidation capacity of the system. Under acidic conditions, TOC removal rate was much higher than in alkaline conditions, which might be related to the behavior of the catalyst surface functional group and the accumulation of inorganic carbon in the system. In addition, the relationship between the form of surface hydroxyl groups on the catalyst and pH was proposed, and the formation pathways of active species under different circumstances were speculated.
- ozonation,
- heterogeneous catalytic ozonation,
- acid-thermal oxidation modification,
- supported catalysts,
- mechanism

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References

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