科研之友
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摘要
Co(II) mediated activation of peroxymonosulfate (PMS) could degrade phosphonate effectively, whereas the degradation of amino phosphonate remains unclear. Herein, nitrilotris (methylene phosphonic acid) (NTMP) was used as a target pollutant;the degradation mechanism was investigated using the electron paramagnetic resonance spectrum (EPR), free radical trapping experiments, and chemical probe experiments;and the possible degradation pathways of NTMP and the influencing factors were analyzed. The results showed that NTMP was completely degraded within 20 min in the Co(II)/PMS system, and 78.3% of NTMP was oxidized to orthophosphate (PO43-) after 60 min of reaction. The Co(II)-PMS complex was the main active oxidizing species, whereas 1O2, HO·, and SO4-·contributed little to the oxidation of NTMP in the Co(II)/PMS system. A variety of intermediates containing phosphate groups were obtained through the breakage of the C-N bond and C-P bond as NTMP reacted with the Co(II)-PMS complex and finally were oxidized to PO43-. With the increase in PMS dosage and Co(II) dosage, the generation rate of PO43- during the oxidation process of NTMP was significantly improved. In addition, the presence of HCO3- and natural organic matter (NOM) greatly inhibited the generation of PO43- in the Co(II)/PMS system. This study further improved the oxidation mechanism of phosphonate in the Co(II)/PMS system and provides a reference for the removal of phosphonate in wastewater.
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