OXIDATION PERFORMANCE OF NITRILOTRIS (METHYLENE PHOSPHONIC ACID) BY POTASSIUM PERMANGANATE

PENG Juanjuan; LIU Shaomin; ZHU Jinglin

doi:10.13205/j.hjgc.202404016

Volume 42 Issue 4

Apr. 2024

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PENG Juanjuan, LIU Shaomin, ZHU Jinglin. OXIDATION PERFORMANCE OF NITRILOTRIS (METHYLENE PHOSPHONIC ACID) BY POTASSIUM PERMANGANATE[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(4): 132-138. doi: 10.13205/j.hjgc.202404016

Citation:

PENG Juanjuan, LIU Shaomin, ZHU Jinglin. OXIDATION PERFORMANCE OF NITRILOTRIS (METHYLENE PHOSPHONIC ACID) BY POTASSIUM PERMANGANATE[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(4): 132-138. doi: 10.13205/j.hjgc.202404016

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OXIDATION PERFORMANCE OF NITRILOTRIS (METHYLENE PHOSPHONIC ACID) BY POTASSIUM PERMANGANATE

doi: 10.13205/j.hjgc.202404016

School of Earth and Environment, Anhui University of Science and Technology,Huainan 232001, China

Received Date: 2023-04-26
Available Online: 2024-06-01

Abstract

Abstract

Organic pollutants could be degraded by KMnO₄, and the oxidation process of phosphonates by KMnO₄ is still unclear. Herein, using nitrilotris (methylene phosphonic acid, NTMP) as a model pollutant, radical capture experiments and electron paramagnetic resonance (EPR) were used to explore the dominant active oxidizing species in KMnO₄ system, and the effects of solution chemical properties (such as pH, coexisting substances, actual water body, etc.) on the degradation of NTMP by KMnO₄ were investigated. The results showed that direct oxidation of KMnO₄ was the dominant pathway for NTMP degradation, and its degradation was greatly influenced by pH value. The best oxidation performance of NTMP by KMnO₄ was obtained at pH=5.0, and 51.4% of NTMP was oxidized into PO^3-₄, much higher than that in UV/H₂O₂ and UV/potassium persulfate (PDS) system. No obvious inhibition on the degradation of NTMP was observed in the presence of coexisting substances in water (i.e., SO^2-₄, NO^-₃, HCO^-₃, and humic acid). In addition, KMnO₄ also showed a high degradation efficiency on NTMP in actual wastewater, and its selectivity was better than that of free radical systems. The results provide an important reference for the efficient removal of phosphonates from actual wastewater.
- potassium permanganate,
- nitrilotris (methylene phosphonic acid),
- direct oxidation,
- orthophosphate

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References(39)

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