Electrochemically treated nanoporous TiO2 was employed as a novel electrode to assist in the pho- toelectrochemical degradation of acetaminophen and valacyclovir. The prepared electrode was characterized by scanning e...Electrochemically treated nanoporous TiO2 was employed as a novel electrode to assist in the pho- toelectrochemical degradation of acetaminophen and valacyclovir. The prepared electrode was characterized by scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. Cyclic voltammetry （CV）, Mott-Schottky plots, ultraviolet-visible light （UV-vis） absorbance spec- troscopy, and a total organic carbon （TOC） analyzer were employed to investigate the photoelec- trochemical degradation of acetaminophen and valacyclovir. The results indicated no obvious re- moval of acetaminophen and valacyclovir over 3 h when separate photochemical degradation and electrochemical oxidation were employed. In contrast, acetaminophen and valacyclovir were rapid- ly eliminated via photoelectrochemical degradation. In addition, electrochemically treated nanopo~ rous TiO2 electrodes significantly enhanced the efficacy of the photoelectrochemical degradation of acetaminophen and valacyclovir, by 86.96% and 53.12%, respectively, when compared with un- treated nanoporous TiO2 electrodes. This enhanced performance may have been attributed to the formation of Ti3~, Ti2~, and oxygen vacancies, as well as an improvement in conductivity during the electrochemical reduction process. The effect of temperature was further investigated, where the activation energy of the photoelectrochemical degradation of acetaminophen and valacyclovir was determined to be 9.62 and 18.42 kJ/mol, respectively.展开更多
A PbO2/Sb-SnO2/TiO2 nanotube array composite electrode was successfully synthesized and its electrochemical oxidation properties were investigated.Field-emission scanning electron microscopy(FE-SEM)and X-ray diffracti...A PbO2/Sb-SnO2/TiO2 nanotube array composite electrode was successfully synthesized and its electrochemical oxidation properties were investigated.Field-emission scanning electron microscopy(FE-SEM)and X-ray diffraction(XRD)results showed that the PbO2 coating was composed of anα-PbO2 inner layer and aβ-PbO2 outer layer.Accelerated life measurement indicated that the composite electrode had a lifetime of 815 h.Rhodamine B(RhB)was employed as a model pollutant to analyze the electrocatalytic activity of the electrode.The effects of initial RhB concentration,current density,initial pH,temperature,and chloride ion concentration on the electrochemical oxidation were investigated in detail.Inductively coupled plasma atomic emission spectroscopy(ICP-AES)results suggested that the concentration of leached Pb^2+in the electrolyte during the electrocatalytic oxidation process can be neglected.Finally,the degradation mechanism during the electrocatalytic oxidation process was proposed based on the results of solid-phase micro-extraction-gas chromatography-mass spectrometry(SPME-GC-MS).The high electrocatalytic performance of the composite electrode makes it a promising anode for the treatment of organic pollutants in aqueous solution.展开更多
基金supported by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada(NSERC).G.H.Xie thanks the State Scholarship Fund of China Scholarship Council(CSC)the Natural Science Foundation of Henan Province(122300410177).A.C.Chen ac-knowledges NSERCthe Canada Foundation for Innovation for the Canada Research Chair Award~~
文摘Electrochemically treated nanoporous TiO2 was employed as a novel electrode to assist in the pho- toelectrochemical degradation of acetaminophen and valacyclovir. The prepared electrode was characterized by scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. Cyclic voltammetry （CV）, Mott-Schottky plots, ultraviolet-visible light （UV-vis） absorbance spec- troscopy, and a total organic carbon （TOC） analyzer were employed to investigate the photoelec- trochemical degradation of acetaminophen and valacyclovir. The results indicated no obvious re- moval of acetaminophen and valacyclovir over 3 h when separate photochemical degradation and electrochemical oxidation were employed. In contrast, acetaminophen and valacyclovir were rapid- ly eliminated via photoelectrochemical degradation. In addition, electrochemically treated nanopo~ rous TiO2 electrodes significantly enhanced the efficacy of the photoelectrochemical degradation of acetaminophen and valacyclovir, by 86.96% and 53.12%, respectively, when compared with un- treated nanoporous TiO2 electrodes. This enhanced performance may have been attributed to the formation of Ti3~, Ti2~, and oxygen vacancies, as well as an improvement in conductivity during the electrochemical reduction process. The effect of temperature was further investigated, where the activation energy of the photoelectrochemical degradation of acetaminophen and valacyclovir was determined to be 9.62 and 18.42 kJ/mol, respectively.
基金supported by the National Natural Science Foundation of China(21507104)Natural Science Basic Research Plan in Shaanxi Province of China(2017JM2015)~~
文摘A PbO2/Sb-SnO2/TiO2 nanotube array composite electrode was successfully synthesized and its electrochemical oxidation properties were investigated.Field-emission scanning electron microscopy(FE-SEM)and X-ray diffraction(XRD)results showed that the PbO2 coating was composed of anα-PbO2 inner layer and aβ-PbO2 outer layer.Accelerated life measurement indicated that the composite electrode had a lifetime of 815 h.Rhodamine B(RhB)was employed as a model pollutant to analyze the electrocatalytic activity of the electrode.The effects of initial RhB concentration,current density,initial pH,temperature,and chloride ion concentration on the electrochemical oxidation were investigated in detail.Inductively coupled plasma atomic emission spectroscopy(ICP-AES)results suggested that the concentration of leached Pb^2+in the electrolyte during the electrocatalytic oxidation process can be neglected.Finally,the degradation mechanism during the electrocatalytic oxidation process was proposed based on the results of solid-phase micro-extraction-gas chromatography-mass spectrometry(SPME-GC-MS).The high electrocatalytic performance of the composite electrode makes it a promising anode for the treatment of organic pollutants in aqueous solution.
