Recently,heterogeneous activation of peroxymonosulfate(PMS) to oxidatively degrade organic pollutants has been a hotspot.In the present work,copper ferrite-graphite oxide hybrid(CuFe2 O4@GO)was prepared and used as ca...Recently,heterogeneous activation of peroxymonosulfate(PMS) to oxidatively degrade organic pollutants has been a hotspot.In the present work,copper ferrite-graphite oxide hybrid(CuFe2 O4@GO)was prepared and used as catalyst to activate PMS for degradation of methylene blue(MB) in aqueous solution.A high degradation efficiency(93.3%) was achieved at the experimental conditions of20 mg/L MB,200 mg/L CuFe2 O4@GO,0.8 mmol/L PMS,and 25℃temperature.Moreover,CuFe2 O4@GO showed an excellent reusability and stability.The effects of various operational parameters including pollutant type,solution pH,catalyst dosage,PMS dosage,pollutant concentration,temperature,natural organic matter(NOM),and inorganic anions on the catalytic degradation process were comprehensively investigated and elucidated.The further mechanistic study revealed the Cu(Ⅱ)/Cu(Ⅰ) redox couple on CuFe2 O4@GO played the dominant role in PMS activation,where both hydroxyl and sulfate radicals were generated and proceeded the degradation of pollutants.In general,CuFe2 O4@GO is a promising heterocatalyst for PMS-based advanced oxidation processes(AOPs) in wastewater treatment.展开更多
Magnetic MnFe2O4-bentonite was synthesized by chemical co-precipitation method（CCM） and applied as catalyst in heterogeneous activation of persulfate（PS） to oxidize a target pollutant, 2,4-dichlorophenol（2,4-DCP...Magnetic MnFe2O4-bentonite was synthesized by chemical co-precipitation method（CCM） and applied as catalyst in heterogeneous activation of persulfate（PS） to oxidize a target pollutant, 2,4-dichlorophenol（2,4-DCP）, in aqueous solutions. The surface morphology and structure of MnFe2On-bentonite were characterized by X-ray diffraction（XRD）, scanning electron microscope（SEM）, energy dispersive X-ray（EDX） and X-ray photoelectron spectroscopy（XPS） analyses.The catalytic activity of MnFe2O4-bentonite for 2,4-DCP degradation was evaluated considering the effects of various process parameters, such as mass ratio of MnFe2O4 to bentonite, concentration of catalyst, PS concentration, and pH. The MnFe2O4-bentonite hybrid exhibited higher catalytic activity than pure MnFe2O4. Treatment with 5 g/L MnFe2O4-bentonite at 30℃ for 240 rain oxidized 92% of 100 mg/L 2,4-DCP（70.2% mineralization）, whereas treatment with pure MnFe2O4 under the same condition oxidized only 70% of the pollutant. This result indicate the erdlanced performance of the activated PS. Moreover, MnFe2O4-bentonite exhibits stable performance with minimal loss in activity after five successive runs. Thus, MnFe2O4-bentonite could be a promising catalyst in oxidative degradation of 2,4-DCE展开更多
A mesoporous cobalt aluminate(CoAl_(2)O_(4))spinel is synthesized through a combustion method and adopted for the activation of peroxymonosulfate(PMS)to degrade organic pollutants.Multiple characterization procedures ...A mesoporous cobalt aluminate(CoAl_(2)O_(4))spinel is synthesized through a combustion method and adopted for the activation of peroxymonosulfate(PMS)to degrade organic pollutants.Multiple characterization procedures are conducted to investigate the morphology and physicochemical properties of the CoAl_(2)O_(4)spinel.Due to its mesoporous structure,large surface area,and high electrical conductivity,the obtained CoAl_(2)O_(4)exhibits remarkable catalytic activity for Rhodamine B(RhB)degradation.Its RhB degradation rate is 89.0 and 10.5 times greater than those of Co_(3)O_(4) and CoAl_(2)O_(4)spinel prepared by a precipitation method,respectively.Moreover,the mesoporous CoAl_(2)O_(4)spinel demonstrates a broad operating pH range and excellent recyclability.The influence of several parameters(catalyst amount,PMS concentration,initial p H,and coexisting inorganic anions)on the oxidation of RhB is evaluated.Through quenching tests and electron paramagnetic resonance experiments,sulfate radicals are identified as the predominant reactive species in RhB degradation.This paper provides new insights for the development of efficient,stable,and reusable cobalt-based heterogeneous catalysts and promotes the application of persulfate activation technology for the treatment of refractory organic wastewater.展开更多
基金the Collaborative Innovation Plan of Hubei Province for Key Technologies in the Eco-Ramie Industryfinancially supported by the Natural Science Foundation of Hubei Province,China (No.2018CFB515)the financial support from the National Natural Science Foundation of China (No.41701541)
文摘Recently,heterogeneous activation of peroxymonosulfate(PMS) to oxidatively degrade organic pollutants has been a hotspot.In the present work,copper ferrite-graphite oxide hybrid(CuFe2 O4@GO)was prepared and used as catalyst to activate PMS for degradation of methylene blue(MB) in aqueous solution.A high degradation efficiency(93.3%) was achieved at the experimental conditions of20 mg/L MB,200 mg/L CuFe2 O4@GO,0.8 mmol/L PMS,and 25℃temperature.Moreover,CuFe2 O4@GO showed an excellent reusability and stability.The effects of various operational parameters including pollutant type,solution pH,catalyst dosage,PMS dosage,pollutant concentration,temperature,natural organic matter(NOM),and inorganic anions on the catalytic degradation process were comprehensively investigated and elucidated.The further mechanistic study revealed the Cu(Ⅱ)/Cu(Ⅰ) redox couple on CuFe2 O4@GO played the dominant role in PMS activation,where both hydroxyl and sulfate radicals were generated and proceeded the degradation of pollutants.In general,CuFe2 O4@GO is a promising heterocatalyst for PMS-based advanced oxidation processes(AOPs) in wastewater treatment.
基金Supported by the Key Project of the National Natural Science Foundation of China（No.41530636） and the National Natural Science Foundation of China（Nos.41302184, 41471252 ）.
文摘Magnetic MnFe2O4-bentonite was synthesized by chemical co-precipitation method（CCM） and applied as catalyst in heterogeneous activation of persulfate（PS） to oxidize a target pollutant, 2,4-dichlorophenol（2,4-DCP）, in aqueous solutions. The surface morphology and structure of MnFe2On-bentonite were characterized by X-ray diffraction（XRD）, scanning electron microscope（SEM）, energy dispersive X-ray（EDX） and X-ray photoelectron spectroscopy（XPS） analyses.The catalytic activity of MnFe2O4-bentonite for 2,4-DCP degradation was evaluated considering the effects of various process parameters, such as mass ratio of MnFe2O4 to bentonite, concentration of catalyst, PS concentration, and pH. The MnFe2O4-bentonite hybrid exhibited higher catalytic activity than pure MnFe2O4. Treatment with 5 g/L MnFe2O4-bentonite at 30℃ for 240 rain oxidized 92% of 100 mg/L 2,4-DCP（70.2% mineralization）, whereas treatment with pure MnFe2O4 under the same condition oxidized only 70% of the pollutant. This result indicate the erdlanced performance of the activated PS. Moreover, MnFe2O4-bentonite exhibits stable performance with minimal loss in activity after five successive runs. Thus, MnFe2O4-bentonite could be a promising catalyst in oxidative degradation of 2,4-DCE
基金financial support from the National Natural Science Foundation of China(No.51604194)China Scholarship Council(No.201808420137)Nanyang Environment and Water Research Institute(Core Fund),Nanyang Technological University,Singapore。
文摘A mesoporous cobalt aluminate(CoAl_(2)O_(4))spinel is synthesized through a combustion method and adopted for the activation of peroxymonosulfate(PMS)to degrade organic pollutants.Multiple characterization procedures are conducted to investigate the morphology and physicochemical properties of the CoAl_(2)O_(4)spinel.Due to its mesoporous structure,large surface area,and high electrical conductivity,the obtained CoAl_(2)O_(4)exhibits remarkable catalytic activity for Rhodamine B(RhB)degradation.Its RhB degradation rate is 89.0 and 10.5 times greater than those of Co_(3)O_(4) and CoAl_(2)O_(4)spinel prepared by a precipitation method,respectively.Moreover,the mesoporous CoAl_(2)O_(4)spinel demonstrates a broad operating pH range and excellent recyclability.The influence of several parameters(catalyst amount,PMS concentration,initial p H,and coexisting inorganic anions)on the oxidation of RhB is evaluated.Through quenching tests and electron paramagnetic resonance experiments,sulfate radicals are identified as the predominant reactive species in RhB degradation.This paper provides new insights for the development of efficient,stable,and reusable cobalt-based heterogeneous catalysts and promotes the application of persulfate activation technology for the treatment of refractory organic wastewater.
