The electro chemical process to produce sodium ferrate flocculent using solid polymer electrolyte (SPE) anion exchange membrane as separator has been described. Ferrate having a high redox potential(1.9V in acid solut...The electro chemical process to produce sodium ferrate flocculent using solid polymer electrolyte (SPE) anion exchange membrane as separator has been described. Ferrate having a high redox potential(1.9V in acid solution) has been used as an oxidant in treatment of dye wastewater. The OH- transfer rate from thecathodic chamber to the anodic chamber and the steady state polarization have been investigated. Results show that both of the degradation and decolorization of dye, acid chrome blue are efficient. It is a first order reaction with a rateconstant: k=7.8×10-4s-1.展开更多
目的在铜表面制备聚吡咯涂层,研究其在3.5%(质量分数)Na Cl溶液中的耐腐蚀性能。方法采用恒电位法、恒电流法和循环伏安法在铜表面制备聚吡咯薄膜,用扫描电子显微镜观察聚吡咯膜形貌,用动电位极化曲线、长期浸泡实验研究铜表面聚吡咯膜...目的在铜表面制备聚吡咯涂层,研究其在3.5%(质量分数)Na Cl溶液中的耐腐蚀性能。方法采用恒电位法、恒电流法和循环伏安法在铜表面制备聚吡咯薄膜,用扫描电子显微镜观察聚吡咯膜形貌,用动电位极化曲线、长期浸泡实验研究铜表面聚吡咯膜的防腐蚀情况。结果三种方法都可以在铜表面形成结构致密、结合力较好的呈菜花状结构的聚吡咯膜。聚吡咯膜在3.5%(质量分数)Na Cl溶液中的极化曲线与空白铜不同,形成了钝化区。在60 min,0.659 V和60 min,1 m A条件下制备的聚吡咯膜的腐蚀电位与空白铜片相比,分别提高了约50 m V和150 m V,阳极溶解电流密度比空白铜片均降低了1个数量级。在长期浸泡实验中,带有聚吡咯膜的铜片的腐蚀速度低于空白铜片。结论聚吡咯膜可以延缓铜片的腐蚀,恒电位法制备的聚吡咯膜具有更优良的耐蚀性能。展开更多
A new green technology of producing chromic anhydride with an electrochemical synthesis method was studied to solve the pollution problems in the traditional production process of chromic anhydride.A self-made electro...A new green technology of producing chromic anhydride with an electrochemical synthesis method was studied to solve the pollution problems in the traditional production process of chromic anhydride.A self-made electrosynthesis reactor of pure titanium and stainless steel, with a multiple-unit metal oxides combination anode, a cathode of stainless steel, and a reinforced combination cation exchange membrane with perfluorosulfonic and perfluorocarboxylic polymers was used to carry out, the direct electrochemical synthesis experiment of chromic anhydride from sodium dichromate.From the experimental results and the principle of electrochemical reaction, it was found that the process of electrochemical synthesis reaction of chromic anhydride might be quantitatively followed by the variation of operating voltage measured macroscopically with reaction time. Operating voltages were experimentally measured at the different initial sodium dichromate concentrations of the anolyte in the electrosynthesis process of chromic anhydride, and the variation of operating voltage with reaction time was discussed. The mathematical model of the variation of operating voltages with reaction time and the rate of change equations of operating voltage were established.The model characterizes the change of operating voltages in the electrosynthesis process of chromic anhydride, and provideds the foundations for the further study and process monitoring of the electrochemical synthesis of chromic anhydride.展开更多
Polythiophene (PTh) was prepared by the direct electrochemical synthesis in an ionic liquid ([BMIM]PF6) containing 0.1 mol/L thiophene by cyclic voltammetry, constant potential and constant current techniques. It is ...Polythiophene (PTh) was prepared by the direct electrochemical synthesis in an ionic liquid ([BMIM]PF6) containing 0.1 mol/L thiophene by cyclic voltammetry, constant potential and constant current techniques. It is found that smooth and bluegreen PTh films can be obtained at a potential of ca. +1.75 V ( vs. Ag/AgCl ) or a current of ca. 1.5 mA cm-2 in the ionic liquid.展开更多
文摘The electro chemical process to produce sodium ferrate flocculent using solid polymer electrolyte (SPE) anion exchange membrane as separator has been described. Ferrate having a high redox potential(1.9V in acid solution) has been used as an oxidant in treatment of dye wastewater. The OH- transfer rate from thecathodic chamber to the anodic chamber and the steady state polarization have been investigated. Results show that both of the degradation and decolorization of dye, acid chrome blue are efficient. It is a first order reaction with a rateconstant: k=7.8×10-4s-1.
文摘目的在铜表面制备聚吡咯涂层,研究其在3.5%(质量分数)Na Cl溶液中的耐腐蚀性能。方法采用恒电位法、恒电流法和循环伏安法在铜表面制备聚吡咯薄膜,用扫描电子显微镜观察聚吡咯膜形貌,用动电位极化曲线、长期浸泡实验研究铜表面聚吡咯膜的防腐蚀情况。结果三种方法都可以在铜表面形成结构致密、结合力较好的呈菜花状结构的聚吡咯膜。聚吡咯膜在3.5%(质量分数)Na Cl溶液中的极化曲线与空白铜不同,形成了钝化区。在60 min,0.659 V和60 min,1 m A条件下制备的聚吡咯膜的腐蚀电位与空白铜片相比,分别提高了约50 m V和150 m V,阳极溶解电流密度比空白铜片均降低了1个数量级。在长期浸泡实验中,带有聚吡咯膜的铜片的腐蚀速度低于空白铜片。结论聚吡咯膜可以延缓铜片的腐蚀,恒电位法制备的聚吡咯膜具有更优良的耐蚀性能。
文摘A new green technology of producing chromic anhydride with an electrochemical synthesis method was studied to solve the pollution problems in the traditional production process of chromic anhydride.A self-made electrosynthesis reactor of pure titanium and stainless steel, with a multiple-unit metal oxides combination anode, a cathode of stainless steel, and a reinforced combination cation exchange membrane with perfluorosulfonic and perfluorocarboxylic polymers was used to carry out, the direct electrochemical synthesis experiment of chromic anhydride from sodium dichromate.From the experimental results and the principle of electrochemical reaction, it was found that the process of electrochemical synthesis reaction of chromic anhydride might be quantitatively followed by the variation of operating voltage measured macroscopically with reaction time. Operating voltages were experimentally measured at the different initial sodium dichromate concentrations of the anolyte in the electrosynthesis process of chromic anhydride, and the variation of operating voltage with reaction time was discussed. The mathematical model of the variation of operating voltages with reaction time and the rate of change equations of operating voltage were established.The model characterizes the change of operating voltages in the electrosynthesis process of chromic anhydride, and provideds the foundations for the further study and process monitoring of the electrochemical synthesis of chromic anhydride.
基金support from the National Natural Science Foundation of China(20004010)
文摘Polythiophene (PTh) was prepared by the direct electrochemical synthesis in an ionic liquid ([BMIM]PF6) containing 0.1 mol/L thiophene by cyclic voltammetry, constant potential and constant current techniques. It is found that smooth and bluegreen PTh films can be obtained at a potential of ca. +1.75 V ( vs. Ag/AgCl ) or a current of ca. 1.5 mA cm-2 in the ionic liquid.
