The factors and mechanisms of oxidative degradation of three organophosphorus pesticides (dichlorvos, methamidophos and phoxim) were studied with sodium percarbonate (SPC) as a solid oxidant. The result showed tha...The factors and mechanisms of oxidative degradation of three organophosphorus pesticides (dichlorvos, methamidophos and phoxim) were studied with sodium percarbonate (SPC) as a solid oxidant. The result showed that SPC has highly activity in degrading these organophosphous pesticides. The most efficient degradation of pesticides occurred under basic conditions and the degradation rates increased with time extension and high temperature. The degradation of organophosphorus pesticides was expected to get even better results at lower initial concentration. Furthermore, we analyzed the intermediate products by NMP, spectrometry. On the basis of the analytical result, the oxidative degradation mechanism was proposed for each organophosphous pesticide. It is significant to understand the environment chemistry of organophosphorus pesticides in environmental system.展开更多
Sodium percarbonate(Na_(2)CO_(3)·1.5H_(2)O_(2),SPC)has been extensively employed as a solid substitute of H_(2)O_(2)for Fenton process in water treatment,because of its high stability during the production,transp...Sodium percarbonate(Na_(2)CO_(3)·1.5H_(2)O_(2),SPC)has been extensively employed as a solid substitute of H_(2)O_(2)for Fenton process in water treatment,because of its high stability during the production,transport,storage and usage.In addition,SPC can be applied in a wider range of work pH,it is also applied as a buffer in Fenton reaction for preventing a drop in pH.Herein,we have synthesized basic copper molybdate(BCM)nanoblocks with the molecular formula of Cu_(3)(MoO_(4))_(2)(OH)_(2)as an efficient and heterogeneous catalyst for antibiotics degradation via percarbonate activation.First,fully physical characterizations confirmed BCM nanocomposite exhibited a structure of nanoblocks.We also found that BCM/SPC system could work in a much wider pH range,compared with H_(2)O_(2).Then,BCM/SPC system presented a good anti-interference ability for natural organic matter in OTC degradation.EPR results and Quenching tests confirmed that the co-presence of·CO_(3)-,·O_(2)-,1O_(2)and·OH in BCM/SPC system.展开更多
文摘The factors and mechanisms of oxidative degradation of three organophosphorus pesticides (dichlorvos, methamidophos and phoxim) were studied with sodium percarbonate (SPC) as a solid oxidant. The result showed that SPC has highly activity in degrading these organophosphous pesticides. The most efficient degradation of pesticides occurred under basic conditions and the degradation rates increased with time extension and high temperature. The degradation of organophosphorus pesticides was expected to get even better results at lower initial concentration. Furthermore, we analyzed the intermediate products by NMP, spectrometry. On the basis of the analytical result, the oxidative degradation mechanism was proposed for each organophosphous pesticide. It is significant to understand the environment chemistry of organophosphorus pesticides in environmental system.
基金Financial support from the NSFC(Nos.21972073,22136003,21805166 and 22206188)the 111 Project of China(No.D20015)and Natural Science Foundation of Hubei Province,China(No.2022CFB275)is gratefully acknowledged。
文摘Sodium percarbonate(Na_(2)CO_(3)·1.5H_(2)O_(2),SPC)has been extensively employed as a solid substitute of H_(2)O_(2)for Fenton process in water treatment,because of its high stability during the production,transport,storage and usage.In addition,SPC can be applied in a wider range of work pH,it is also applied as a buffer in Fenton reaction for preventing a drop in pH.Herein,we have synthesized basic copper molybdate(BCM)nanoblocks with the molecular formula of Cu_(3)(MoO_(4))_(2)(OH)_(2)as an efficient and heterogeneous catalyst for antibiotics degradation via percarbonate activation.First,fully physical characterizations confirmed BCM nanocomposite exhibited a structure of nanoblocks.We also found that BCM/SPC system could work in a much wider pH range,compared with H_(2)O_(2).Then,BCM/SPC system presented a good anti-interference ability for natural organic matter in OTC degradation.EPR results and Quenching tests confirmed that the co-presence of·CO_(3)-,·O_(2)-,1O_(2)and·OH in BCM/SPC system.