| The foamed titanium/SnO2-Sb electrode has the characteristics of high oxygen evolution potential,high electrocatalytic activity,etc.,which can effectively improve the efficiency of sewage degradation,but its stability is poor and the electrode life is short,while the composite energy of TiO2-NTs and SnO2-Sb It can effectively improve the catalytic activity of the electrode and prolong its service life,so the preparation of the foamed titanium/TiO2-NTs/SnO2-Sb composite electrode has important practical significance.The thesis uses the sol-gel method to prepare the foamed titanium/SnO2-Sb electrode,and prepares the TiO2-NTs intermediate layer based on the anodic oxidation of the foamed titanium,and prepares the foamed titanium/TiO2-NTs/SnO2-Sb on the basis of the intermediate layer by the sol-gel method Composite electrode;The crystal structure,morphology and electrocatalytic degradation performance of the electrode were characterized by XRD,SEM,COD,etc.;the effect of the TiO2-NTs array layer on the electrode’s catalytic performance and stability was studied;the precursor solution Sn Cl4·5H2O concentration,The effect of thermal reaction time,thermal reaction temperature,and the number of coating layers on the performance of the coating.Research indicates:（1）The foamed titanium-SnO2-Sb electrode was prepared by the sol-gel method.The best preparation process conditions for the research electrode are:temperature 60℃,molar ratio of citric acid and n-butanol 1:5,absolute ethanol as solvent,adding 0.1 mol/L Sn Cl4·5H2O to prepare n（Sb）:n（Sn）=1:9 sol-gel solution,and evenly coat it on the foamed titanium substrate,thermally decompose at 450°C for 15 minutes,repeat the coating-calcination process 15 times to increase the coating thickness,and thermally react at 450°C for 1 hour to obtain the final electrode.（2）The TiO2-NTs array layer was grown in situ on the surface of the foamed titanium substrate by anodizing to prepare the foamed titanium/TiO2-NTs/SnO2-Sb electrode.The effect of the growth conditions of the TiO2-NTs array layer on the performance of the coated electrode was studied.The results show that the electrolyte composition is a ethylene glycol solution of 0.5wt%NH4F and 2vol%H2O.The foamed titanium is oxidized at 50V for 1 hour and then calcined at 450°C for 1 hour to prepare TiO2-NTs arrays.The SnO2-Sb coating was coated on the TiO2-NTs intermediate layer according to the researched best process and calcined at 450℃to prepare foamed titanium/TiO2-NTs/SnO2-Sb electrode.The surface morphology analysis results show that the surface of the foamed titanium/TiO2-NTs/SnO2-Sb electrode coating is dense,uniform,without agglomeration of large particles,and the coating load is high.（3）The electrode failure mechanism research results show that the coated electrode is dissolved or peeled off due to the interaction of ions,molecules and other particles in the phenol solution;inactive materials cover the surface of the coating,causing the coating to passivation or the active material to pass through the cracks and foam The contact of the titanium substrate leads to the production of an insulating layer of TiO2,which causes the coating to fall off and the electrode is deactivated.（4）The foamed titanium/TiO2-NTs/SnO2-Sb composite electrode was used to electrolyze the simulated wastewater at a current density of 60m A/cm2.The research results show that the degradation COD value of phenol is compared with that of the foamed titanium-SnO2-Sb coated electrode,from 75mg/L to 36mg/L,and the removal rate reaches 84.7%;the actual service life of the electrode is extended from 632h to 1000h;... |
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