Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale...Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale with an average diameter of approximately 12 to 18 nm. The introduction of Fe3O4 MNPs increased levofloxacin sono-degradation in the US/H2O2 system. Experimental parameters, such as Fe3O4 MNP dose, initial solution p H, and H2O2 concentration, were investigated by a one-factor-at-a-time approach. The results showed that Fe3O4 MNPs enhanced levofloxacin removal in the p H range from 4.0 to 9.0. Levofloxacin removal ratio increased with Fe3O4 MNP dose up to 1.0 g·L-1and with H2O2 concentration until reaching the maximum. Moreover, three main intermediate compounds were identified by HPLC with electrospray ionisation tandem mass spectrometry, and a possible degradation pathway was proposed. This study suggests that combination of H2O2, Fe3O4 MNPs and US is a good way to improve the degradation efficiency of antibiotics.展开更多
A new coordi nation comp ound Co(Ⅲ)abstract:Hdmg)abstract: 2 (H 2 O)abstract: 2 Mn(Ⅱ)abstract:Cl 3 was synthesized and its crystal structure was determined.The crystal data ar e as follows:crystal system,orthorhombi...A new coordi nation comp ound Co(Ⅲ)abstract:Hdmg)abstract: 2 (H 2 O)abstract: 2 Mn(Ⅱ)abstract:Cl 3 was synthesized and its crystal structure was determined.The crystal data ar e as follows:crystal system,orthorhombic;space group,C222 1 (#20)abstract:;a=1.18315(3)abstract:nm,b=1.28631(5)abstract:nm,c=1.14355(2)abstract:nm,V=1.74037(9)abstract:nm 3 ,Z=4,D c =1.857g·cm -3 ,F(000)abstract:=980.00,μ (MoK α )abstract:=21.69cm -1 ,R 1 =0.030,wR 2 =0.92.The coordination geometries around Co(Ⅲ)abstract:and Mn(Ⅱ)abstract:atoms are distorted o ct ahedral and distorted trigonal bipyramidal,respectively.The Hdmg chelates Co( Ⅲ)abstract:an d bridges to two Mn(Ⅱ)abstract:atoms to form a polyheteronuclear helical structure alo ng t he c axis.展开更多
基金Supported by the National Natural Science Foundation of China(51009115)Shaanxi Provincial Department of Education Key Laboratory Project(13JS067)+2 种基金the Hall of Shaanxi Province Science and Technology(2013JK0881)the Research Plan Project of Water Resources Department of Shaanxi Province(2013slkj-07)the Innovation of Science and Technology Fund of Xi'an University of Technology(211302)
文摘Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale with an average diameter of approximately 12 to 18 nm. The introduction of Fe3O4 MNPs increased levofloxacin sono-degradation in the US/H2O2 system. Experimental parameters, such as Fe3O4 MNP dose, initial solution p H, and H2O2 concentration, were investigated by a one-factor-at-a-time approach. The results showed that Fe3O4 MNPs enhanced levofloxacin removal in the p H range from 4.0 to 9.0. Levofloxacin removal ratio increased with Fe3O4 MNP dose up to 1.0 g·L-1and with H2O2 concentration until reaching the maximum. Moreover, three main intermediate compounds were identified by HPLC with electrospray ionisation tandem mass spectrometry, and a possible degradation pathway was proposed. This study suggests that combination of H2O2, Fe3O4 MNPs and US is a good way to improve the degradation efficiency of antibiotics.
文摘A new coordi nation comp ound Co(Ⅲ)abstract:Hdmg)abstract: 2 (H 2 O)abstract: 2 Mn(Ⅱ)abstract:Cl 3 was synthesized and its crystal structure was determined.The crystal data ar e as follows:crystal system,orthorhombic;space group,C222 1 (#20)abstract:;a=1.18315(3)abstract:nm,b=1.28631(5)abstract:nm,c=1.14355(2)abstract:nm,V=1.74037(9)abstract:nm 3 ,Z=4,D c =1.857g·cm -3 ,F(000)abstract:=980.00,μ (MoK α )abstract:=21.69cm -1 ,R 1 =0.030,wR 2 =0.92.The coordination geometries around Co(Ⅲ)abstract:and Mn(Ⅱ)abstract:atoms are distorted o ct ahedral and distorted trigonal bipyramidal,respectively.The Hdmg chelates Co( Ⅲ)abstract:an d bridges to two Mn(Ⅱ)abstract:atoms to form a polyheteronuclear helical structure alo ng t he c axis.
基金supported by the Fund for Young Scientists of Sichuan University, China (2011SCU11081)Research Fund for the Doctoral Program of Higher Education, Ministry of Education of China (20120181120103)~~
