Peroxymonosulphate(PMS)activation via nonradical pathways has emerged as a promising pollutant degradation method owing to its highly selective oxidation of organic pollutants and high tolerance to water matrices.Howe...Peroxymonosulphate(PMS)activation via nonradical pathways has emerged as a promising pollutant degradation method owing to its highly selective oxidation of organic pollutants and high tolerance to water matrices.However,the mechanism underlying this nonradical process remains unclear.Herein,we reveal a mechanism for the transformation phenomenon between singlet oxygen(^(1)O_(2))and high-valence Mn species in a spinel MnCo_(2)O_(4.5)/PMS system,which aggressively enhances the degradation rate of organic contaminants and dramatically decreases PMS usage.The mechanism of the transformation is due to the increased valence of Mn via the introduction of Co into spinel Mn_(3)O_(4).These results highlight the mechanism of non-radical pathways in water treatment and provide a new strategy for designing catalysts for PMS activation.展开更多
The graft copolymerization of N,N-dimethylacrylamide onto alginate by free radical polymerization using potassium peroxymonosulphate-sarbose as a redox pair in an inert atmosphere was investigated. The reaction condit...The graft copolymerization of N,N-dimethylacrylamide onto alginate by free radical polymerization using potassium peroxymonosulphate-sarbose as a redox pair in an inert atmosphere was investigated. The reaction conditions for maximum grafting have been optimized by varying the reaction variables, including the concentration of N,N-dimethylacrylamide （7 × 10-2 mol/L to 23 × 10-2 mol/L）, potassium peroxymonosulphate （2 × 10-3 mol/L to 18 × 10-3 mol/L）, sarbose （0.4 × 10-3 mol/L to 3.4 × 10-3 mol/L）, sulphuric acid （1 × 10-3 mol/L to 8 × 10-3 mol/L） and alginic acid （0.4 g/L to 1.8 g/L） along with time duration （60 min to 180 min） and temperature （25℃ to 45℃）. Water swelling capacity, metal ion sorption and flocculation studies of the synthesized graft copolymer have been performed. The graft copolymer has been characterized by FTIR spectroscopy and thermogravimetric analysis.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52301190 and 52231008)Hainan Provincial Natural Science Foundation of China(Nos.KJRC2023L04 and 524QN225)the Starting Research Funds of the Hainan University of China(No.KYQD(ZR)-23091)
文摘Peroxymonosulphate(PMS)activation via nonradical pathways has emerged as a promising pollutant degradation method owing to its highly selective oxidation of organic pollutants and high tolerance to water matrices.However,the mechanism underlying this nonradical process remains unclear.Herein,we reveal a mechanism for the transformation phenomenon between singlet oxygen(^(1)O_(2))and high-valence Mn species in a spinel MnCo_(2)O_(4.5)/PMS system,which aggressively enhances the degradation rate of organic contaminants and dramatically decreases PMS usage.The mechanism of the transformation is due to the increased valence of Mn via the introduction of Co into spinel Mn_(3)O_(4).These results highlight the mechanism of non-radical pathways in water treatment and provide a new strategy for designing catalysts for PMS activation.
文摘The graft copolymerization of N,N-dimethylacrylamide onto alginate by free radical polymerization using potassium peroxymonosulphate-sarbose as a redox pair in an inert atmosphere was investigated. The reaction conditions for maximum grafting have been optimized by varying the reaction variables, including the concentration of N,N-dimethylacrylamide （7 × 10-2 mol/L to 23 × 10-2 mol/L）, potassium peroxymonosulphate （2 × 10-3 mol/L to 18 × 10-3 mol/L）, sarbose （0.4 × 10-3 mol/L to 3.4 × 10-3 mol/L）, sulphuric acid （1 × 10-3 mol/L to 8 × 10-3 mol/L） and alginic acid （0.4 g/L to 1.8 g/L） along with time duration （60 min to 180 min） and temperature （25℃ to 45℃）. Water swelling capacity, metal ion sorption and flocculation studies of the synthesized graft copolymer have been performed. The graft copolymer has been characterized by FTIR spectroscopy and thermogravimetric analysis.
