新型钛基二氧化铅电极的制备及其对全氟辛酸的降解
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摘要
以电化学方法制备了Ti/TiO_2-NTs、Ti/TiO_2-NTs/Ag_2O、Ti/TiO_2-NTs/Ag_2O/PbO_2电极,用TEM、SEM、XRD等方法表征了3种电极表面的形貌。以Ti/TiO_2-NTs/Ag_2O/PbO_2电极作阳极,对100 mg/L的PFOA溶液进行降解。结果表明:在电流密度为30 mA/cm~2下降解180 min后,PFOA去除率可达99.47%,脱氟率高达87.53%,具有较高的电氧化能力。
Electrodes,including Ti/TiO_2-NTs,Ti/TiO_2-NTs/Ag_2O and Ti/TiO_2-NTs/Ag_2O/PbO_2,have been prepared by electrochemical methods,and the surface shapes of the three kinds of electrodes characterized by TEM,SEM and XRD,etc.Ti/TiO_2-NTs/Ag_2O/PbO_2electrode as anodic electrode has been used for the degradation of 100 mg/L of PFOA solution.The results show that PFOA removing rate can reach 99.47%and the defluorination rate is as high as87.53%when current density is 30 m A/cm~2,and degradation time 180 min,having comparatively high electrooxidation ability.
Electrodes,including Ti/TiO_2-NTs,Ti/TiO_2-NTs/Ag_2O and Ti/TiO_2-NTs/Ag_2O/PbO_2,have been prepared by electrochemical methods,and the surface shapes of the three kinds of electrodes characterized by TEM,SEM and XRD,etc.Ti/TiO_2-NTs/Ag_2O/PbO_2electrode as anodic electrode has been used for the degradation of 100 mg/L of PFOA solution.The results show that PFOA removing rate can reach 99.47%and the defluorination rate is as high as87.53%when current density is 30 m A/cm~2,and degradation time 180 min,having comparatively high electrooxidation ability.
引文
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[2]Rigét F,Bossi R,Sonne C,et al.Trends of perfluorochemicals in Greenland ringed seals and polar bears:Indications of shifts to decreasing trends[J].Chemosphere,2013,93(8):1607-1614.
[3]Maisonet M,Terrell M L,Mcgeehin M A,et al.Maternal concentrations of polyfluoroalkyl compounds during pregnancy and fetal and postnatal growth in British girls[J].Environ Health Perspect,2012,120(10):1432-1437.
[4]Darrow L A,Stein C R,Steenland K.Serum perfluorooctanoic acid and perfluorooctane sulfonate concentrations in relation to birth outcomes in the Mid-Ohio Valley,2005-2010[J].Environmental Health Perspectives,2013,121(10):1207-1213.
[5]卓琼芳,杨波,邓述波,等.用于有机物降解的电化学阳极材料[J].化学进展,2012,24(4):628-636.
[6]Vecitis C D,Park H,Cheng J,et al.Treatment technologies for aqueous perfluorooctanesulfonate(PFOS)and perfluorooctanoate(PFOA)[J].Frontiers of Environmental Science and Engineering in China,2009,3(2):129-151.
[7]杨波,李影影,余刚,等.物化作用氧化降解PFOA/PFOS[J].化学进展,2014,26(7):1265-1274.
[8]刘海津,刘国光,侯泽华,等.电化学方法制备掺杂二氧化钛纳米管阵列[J].稀有金属材料与工程,2011,40(4):723-727.
[9]Ravichandran L,Selvam K,Swaminathan M.Highly efficient activated carbon loaded TiO2for photo defluoridation of pentafluorobenzoic acid[J].Journal of Molecular Catalysis A Chemical,2010,317(1):89-96.
[10]Lin Hui,Niu Junfeng,Xu Jiale,et al.Electrochemical mineralization of sulfamethoxazole by Ti/SnO2-Sb/Ce-PbO2anode:Kinetics,reaction pathways,and energy cost evolution[J].Electrochimica Acta,2013,97:167-174.
[11]Zhuo Qiongfang,Deng Shubo,Yang Bo,et al.Degradation of perfluorinated compounds on a boron-doped diamond electrode[J].Electrochimica Acta,2012(77):17-22.-----------