The monoaminotrinitro iron phthalocyanine(FeMATNPc)is used to connect with isonicotinic acid(INA)for amide bonding and axial coordination to synthetic a unique catalyst FeMATNPc-INA,which is loaded in polyacrylonitril...The monoaminotrinitro iron phthalocyanine(FeMATNPc)is used to connect with isonicotinic acid(INA)for amide bonding and axial coordination to synthetic a unique catalyst FeMATNPc-INA,which is loaded in polyacrylonitrile(PAN)nanofibers by electrospinning.The introduction of INA destroys theπ-πconjugated stack structure in phthalocyanine molecules and exposes more active sites.The FeMATNPc-INA structure is characterized by X-ray photoelectron spectroscopy and UV-visible absorption spectrum,and the FeMATNPcINA/PAN structure is characterized by Fourier transform infrared spectroscopy and X-ray diffraction.The FeMATNPc-INA/PAN can effectively activate peroxymonosulfate(PMS)to eliminate carbamazepine(CBZ)within 40 minutes(PMS 1.5 mmol/L)in the dark.The effects of catalyst dosage,PMS concentration,pH and inorganic anion on the degradation of CBZ are investigated.It has been confirmed by electron paramagnetic resonance,gas chromatography–mass spectroscopy and free radical capture experiments that the catalytic system is degraded by·OH,SO4^(·-)and Fe(IV)=O are the major active species,the singlet oxygen(^(1)O_(2))is the secondary active species.The degradation process of CBZ is analyzed by ultra-high performance liquid chromatography-mass spectrometry and the aromatic compounds have been degraded to small molecular acids.展开更多
Inland wetlands play a vital role in mitigating non-point source nitrogen loads through denitrification and anammox processes.However,the impact of varying human activities within the same region on these nitrogen rem...Inland wetlands play a vital role in mitigating non-point source nitrogen loads through denitrification and anammox processes.However,the impact of varying human activities within the same region on these nitrogen removal processes of inland wetlands remains unclear.This study investigated the differences in nitrogen removal rates of wetland sediments under various human activities in Jiashan County,China.^(15)N isotope tracing was used to determine denitrification and anammox rates.Denitrification was the primary nitrogen removal pathway,with an average contribution of 82.34%.Denitrification and anammox rates varied significantly under different human influences,with the highest rates in residential and agricultural areas.NH_(4)^(+),chlorophyll a,NO_(3)^(−),and pH were the main environmental factors.This study highlights the need for targeted wetland management and restoration strategies based on the type and intensity of human activities.Protecting and restoring these“natural purifiers”is crucial for improving regional water quality and maintaining the ecological functions of wetlands in rapidly urbanizing landscapes.展开更多
基金supported by National Natural Science Foundation of China (No.22006136)。
文摘The monoaminotrinitro iron phthalocyanine(FeMATNPc)is used to connect with isonicotinic acid(INA)for amide bonding and axial coordination to synthetic a unique catalyst FeMATNPc-INA,which is loaded in polyacrylonitrile(PAN)nanofibers by electrospinning.The introduction of INA destroys theπ-πconjugated stack structure in phthalocyanine molecules and exposes more active sites.The FeMATNPc-INA structure is characterized by X-ray photoelectron spectroscopy and UV-visible absorption spectrum,and the FeMATNPcINA/PAN structure is characterized by Fourier transform infrared spectroscopy and X-ray diffraction.The FeMATNPc-INA/PAN can effectively activate peroxymonosulfate(PMS)to eliminate carbamazepine(CBZ)within 40 minutes(PMS 1.5 mmol/L)in the dark.The effects of catalyst dosage,PMS concentration,pH and inorganic anion on the degradation of CBZ are investigated.It has been confirmed by electron paramagnetic resonance,gas chromatography–mass spectroscopy and free radical capture experiments that the catalytic system is degraded by·OH,SO4^(·-)and Fe(IV)=O are the major active species,the singlet oxygen(^(1)O_(2))is the secondary active species.The degradation process of CBZ is analyzed by ultra-high performance liquid chromatography-mass spectrometry and the aromatic compounds have been degraded to small molecular acids.
基金Cooperation of Zhejiang Province and the Chinese Academy of Forestry,Grant/Award Number:2023SY11Zhejiang Province Commonwealth Projects,Grant/Award Numbers:LQ23C030003,ZCLQ24C0301+4 种基金Zhejiang Provincial Science and Technology Program,Grant/Award Number:2023C03120National Key Research and Development Program of China,Grant/Award Number:2023YFE0101700National Natural Science Foundation of China,Grant/Award Number:32301368Scientific Research Fund of the Second Institute of Oceanography,SOA,Grant/Award Number:JG2216Zhejiang Provincial Natural Science Foundation of China,Grant/Award Number:LY18D010005。
文摘Inland wetlands play a vital role in mitigating non-point source nitrogen loads through denitrification and anammox processes.However,the impact of varying human activities within the same region on these nitrogen removal processes of inland wetlands remains unclear.This study investigated the differences in nitrogen removal rates of wetland sediments under various human activities in Jiashan County,China.^(15)N isotope tracing was used to determine denitrification and anammox rates.Denitrification was the primary nitrogen removal pathway,with an average contribution of 82.34%.Denitrification and anammox rates varied significantly under different human influences,with the highest rates in residential and agricultural areas.NH_(4)^(+),chlorophyll a,NO_(3)^(−),and pH were the main environmental factors.This study highlights the need for targeted wetland management and restoration strategies based on the type and intensity of human activities.Protecting and restoring these“natural purifiers”is crucial for improving regional water quality and maintaining the ecological functions of wetlands in rapidly urbanizing landscapes.
