The acid-proof anode Ti/SnO2+Mn2O3/PbO2 doped with Ce was prepared by thermal decomposition and electrodeposition combination technology, the effect of Ce on the morphology and structure of anode was also studied in t...The acid-proof anode Ti/SnO2+Mn2O3/PbO2 doped with Ce was prepared by thermal decomposition and electrodeposition combination technology, the effect of Ce on the morphology and structure of anode was also studied in this paper. The results obtained by cyclic voltammetry (CV), electrochemical impedance spectroscopic (EIS), X-ray Diffraction (XRD) and scanning electron microscopy (SEM) indicated that PbO2 crystal grains presented honeycomb structure were formed on the electrode surface by doping with Ce. The specific surface areas and catalytic active sites of the Ce-PbO2 doped electrode were increased and the catalytic activity was evidently greater than the undoped one. However, when Ce was doped into the intermediate layer (SnO2+Mn2O3), a more cracked surface structure formed, thus leading electrode deactivation by passivation of the Ti-substrate. So the anodic stability was decreased according to the accelerated life tests.展开更多
In this study,the Ti/SnO_(2)-RuO_(2) electrodes with different Yb contents were prepared by sol-gel method and thermal decomposition method,and the surface morphology and crystal structure of the electrodes were chara...In this study,the Ti/SnO_(2)-RuO_(2) electrodes with different Yb contents were prepared by sol-gel method and thermal decomposition method,and the surface morphology and crystal structure of the electrodes were characterized by scanning electron microscopy(SEM),atomic force microscopy(AFM) and X-ray diffraction(XRD),the electrochemical properties of the electrodes were tested by linear sweep voltammetry(LSV) and cyclic voltammetry(CV).The electrochemical oxidation device was constructed with Yb-doped Ti/SnO_(2)-RuO_(2) electrode as the anode and titanium plate as the cathode,and the electrochemical oxidation effect and product changes of the anode on co king wastewater were investigated.The results show that the surface of the electrode is flat with high crystallinity of SnO_(2) and RuO_(2) crystals at1.5% Yb doping,and the LSV and CV curves indicate that the Yb doping of 1.5% increases the oxygen precipitation potential and electrocatalytic oxidation activity of the electrode.When the electrode with Yb doping of 1.5% is the anode with current density of 10 mA/cm^(2) electrochemical oxidation time of 30 min,the electrode can remove chemical oxygen demand(COD) up to 85.06%,total organic carbon(TOC) up to 60.59% and UV_(254) from 1.594 to 0.507 for coking wastewater.Gas chromatography(GC-MS),UV-vis and three-dimensional fluorescence results of coking wastewater before and after treatment show that large toxic substances in coking wastewater are degraded to low toxic organic substances,and most soluble organic substances are degraded and transformed.This study provides the possibility of basic research for the engineering practice of electrochemical oxidation for the treatment of coking wastewater.展开更多
Ti/SnO2–Sb electrode has a good effect on the removal of organic pollutants. But its short service life limits its large-scale application in industry. Electro-catalytic degradation performances and service life of t...Ti/SnO2–Sb electrode has a good effect on the removal of organic pollutants. But its short service life limits its large-scale application in industry. Electro-catalytic degradation performances and service life of the electrode can be significantly improved by doping rare earth（RE） ions into the oxide coating of Ti/SnO2–Sb electrode. Ti/SnO2–Sb electrodes doped with different RE elements（Ce, Dy, La, and Eu） were prepared by the thermal decomposition method at 550 ℃. Electro-catalytic degradation performances of electrodes doped with different RE elements were evaluated by linear sweep voltammetry（LSV） and Tafel curves. During the electrolysis,the conversion of p-nitrophenol was performed with these electrodes as anodes under galvanostatic control. The structures and morphologies of the surface coating of the electrodes were characterized by scanning electron microscope（SEM）. The results demonstrate that the electro-catalytic degradation performances of Ti/SnO2–Sb electrodes are improved to different levels by doping different RE ions. Improved Ti/SnO2–Sb electrodes by the introduction of different RE have higher oxygen evolution potential, better electro-catalysis ability, better coverage,and longer electrode life.展开更多
基金the National Natural Science Foundation of China (20476070,20771080)Natural Science Foundation of Shanxi Province (20031024 ,20041020)
文摘The acid-proof anode Ti/SnO2+Mn2O3/PbO2 doped with Ce was prepared by thermal decomposition and electrodeposition combination technology, the effect of Ce on the morphology and structure of anode was also studied in this paper. The results obtained by cyclic voltammetry (CV), electrochemical impedance spectroscopic (EIS), X-ray Diffraction (XRD) and scanning electron microscopy (SEM) indicated that PbO2 crystal grains presented honeycomb structure were formed on the electrode surface by doping with Ce. The specific surface areas and catalytic active sites of the Ce-PbO2 doped electrode were increased and the catalytic activity was evidently greater than the undoped one. However, when Ce was doped into the intermediate layer (SnO2+Mn2O3), a more cracked surface structure formed, thus leading electrode deactivation by passivation of the Ti-substrate. So the anodic stability was decreased according to the accelerated life tests.
基金Project supported by Natural Science Foundation of Inner Mongolia(2018LH04003,2020MS05047)Inner Mongolia Autonomous Region Science Technology Plan Project(201702100)+1 种基金Inner Mongolia Autonomous Region Results Transfer Project(2019CG075)。
文摘In this study,the Ti/SnO_(2)-RuO_(2) electrodes with different Yb contents were prepared by sol-gel method and thermal decomposition method,and the surface morphology and crystal structure of the electrodes were characterized by scanning electron microscopy(SEM),atomic force microscopy(AFM) and X-ray diffraction(XRD),the electrochemical properties of the electrodes were tested by linear sweep voltammetry(LSV) and cyclic voltammetry(CV).The electrochemical oxidation device was constructed with Yb-doped Ti/SnO_(2)-RuO_(2) electrode as the anode and titanium plate as the cathode,and the electrochemical oxidation effect and product changes of the anode on co king wastewater were investigated.The results show that the surface of the electrode is flat with high crystallinity of SnO_(2) and RuO_(2) crystals at1.5% Yb doping,and the LSV and CV curves indicate that the Yb doping of 1.5% increases the oxygen precipitation potential and electrocatalytic oxidation activity of the electrode.When the electrode with Yb doping of 1.5% is the anode with current density of 10 mA/cm^(2) electrochemical oxidation time of 30 min,the electrode can remove chemical oxygen demand(COD) up to 85.06%,total organic carbon(TOC) up to 60.59% and UV_(254) from 1.594 to 0.507 for coking wastewater.Gas chromatography(GC-MS),UV-vis and three-dimensional fluorescence results of coking wastewater before and after treatment show that large toxic substances in coking wastewater are degraded to low toxic organic substances,and most soluble organic substances are degraded and transformed.This study provides the possibility of basic research for the engineering practice of electrochemical oxidation for the treatment of coking wastewater.
基金financially supported by the National Natural Science Foundation of China (No. 51364024 and 51404124)Gansu Province Department of Education Fund (No. 2013A-029)the Foundation of State Key Laboratory of Gansu Advanced Nonferrous Metal Materials (Nos. SKL 1316 and SKL 1314)
文摘Ti/SnO2–Sb electrode has a good effect on the removal of organic pollutants. But its short service life limits its large-scale application in industry. Electro-catalytic degradation performances and service life of the electrode can be significantly improved by doping rare earth（RE） ions into the oxide coating of Ti/SnO2–Sb electrode. Ti/SnO2–Sb electrodes doped with different RE elements（Ce, Dy, La, and Eu） were prepared by the thermal decomposition method at 550 ℃. Electro-catalytic degradation performances of electrodes doped with different RE elements were evaluated by linear sweep voltammetry（LSV） and Tafel curves. During the electrolysis,the conversion of p-nitrophenol was performed with these electrodes as anodes under galvanostatic control. The structures and morphologies of the surface coating of the electrodes were characterized by scanning electron microscope（SEM）. The results demonstrate that the electro-catalytic degradation performances of Ti/SnO2–Sb electrodes are improved to different levels by doping different RE ions. Improved Ti/SnO2–Sb electrodes by the introduction of different RE have higher oxygen evolution potential, better electro-catalysis ability, better coverage,and longer electrode life.
