高锰酸钾氧化氨基三亚甲基膦酸的效能

彭娟娟; 刘少敏; 朱敬林

doi:10.13205/j.hjgc.202404016

高锰酸钾氧化氨基三亚甲基膦酸的效能

doi: 10.13205/j.hjgc.202404016

安徽理工大学地球与环境学院,安徽淮南 232001

基金项目:

安徽省自然科学基金项目(2208085QB63)

安徽理工大学高层次引进人才科研启动基金(2021yjrc04)

安徽省高校科学研究项目(KJ2021A0442)

详细信息

作者简介:
彭娟娟(1999-),女,硕士,主要从事水资源与水处理等方面的研究。3134461553@qq.com

通讯作者:
刘少敏(1972-),男,博士,教授,主要从事水资源与水处理等方面的研究。shmliu@aust.edu.cn

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出版历程
- 收稿日期: 2023-04-26
- 网络出版日期: 2024-06-01

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

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

摘要

摘要: 高锰酸钾(KMnO₄)能有效降解水中有机污染物,但其氧化有机膦酸过程尚不明确。以氨基三亚甲基膦酸(NTMP)为例,采用自由基捕获实验和电子顺磁共振波谱(EPR)探究其在KMnO₄体系下降解的主要活性氧化物种,并考察了溶液化学性质(如pH、共存物质、实际水体等)对KMnO₄氧化降解NTMP的影响。结果表明:KMnO₄直接氧化是NTMP降解的主要途径,且NTMP降解受pH影响较大。当pH=5.0时,KMnO₄氧化NTMP的效果最佳,其中51.4% NTMP被氧化生成PO^3-₄,远高于UV/H₂O₂和UV/过硫酸钾(PDS)体系。水体中共存物质(SO^2-₄、NO^-₃、HCO^-₃和腐植酸)对NTMP的降解抑制作用较小。此外,在实际水体中KMnO₄对NTMP仍有较高的降解效率,且其选择性优于自由基体系。研究结果可为实际废水中有机膦酸的高效去除提供重要参考。
- 高锰酸钾 /
- 氨基三亚甲基膦酸 /
- 直接氧化 /
- 正磷酸盐
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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