Study On The Preparation And Properties Of Novel Photoelectrocatalysts

The organic wastewater generated by the printing and dyeing industry has caused tremendous environmental pressure.How to treat printing and dyeing wastewater with high efficiency and environmental protection has been closely concerned and extensively studied.In recent years,as a new catalytic technology,photoelectric synergistic catalysis has been rapidly developed.It is based on traditional photocatalysis to apply an external circuit,which promotes the separation of photogenerated electrons and holes,prolongs the lifetime of carriers and greatly improves the lifetime.Catalytic efficiency.At the same time,the catalyst is more easily recycled and reused because it is fixed on the electrode substrate,and this advantage is also beneficial to the practical application of the photocatalytic technology.The research focus of this paper is to prepare electrodes with excellent photocatalytic effects,and to explore the optimal conditions for electrode preparation and degradation of reactive brilliant blue dye KN-R.And characterized by SEM,XRD,XPS,LSV,CV,EIS and other methods.The main research contents are as follows:?1?Preparation of Ti/F^-Co₃O₄NWs electrode and its photoelectrocatalytic catalytic performance.The etched titanium sheet is used as a base,and the cobalt nitrate is a cobalt source.Co₃O₄ nanowires are formed on the titanium substrate by hydrothermal and calcination processes.The optimal conditions for degradation were found by changing the temperature of the water and the current in the process of degradation.The experimental results show that the cobalt oxide electrode after the introduction of fluoride ion has a hydrothermal temperature of 90°C,a hydrothermal time of 5 hours,and a decolorization rate of 84%.?2?Preparation of Ti/Co₃O₄NWs/PbO₂ electrode and its photoelectrochemical synergistic catalytic properties.This experiment is a modification of the doping of cobalt oxide nanowires prepared in the previous experiment.Lead is doped by electrodeposition using lead nitrate as a lead source.The experimental results show that the performance of the electrode after PbO₂ deposition is higher than that of the electrode with only Co₃O₄NWs.The optimum deposition time is 20 min and the decolorization rate is up to 82.7%.?3?Preparation of Ti/SnO₂/Co₃O₄NWs electrode and its photoelectrocatalytic catalytic performance.The SnO₂NWs layer and the Co₃O₄NWs layer are successively grown on the surface of the titanium substrate by two hydrothermal processes and high temperature calcination.The experimental results show that the electrode samples prepared at the calcination temperature of 400°C have the best photocatalytic performance,and the decolorization rate can reach 90.2%.?4?Preparation of Ti/SnO₂NWs/PbO₂ electrode and its photoelectrocatalytic catalytic performance.First,a layer of SnO₂NWs was grown on the surface of the titanium substrate by hydrothermal reaction,and then PbO₂ was deposited around the SnO₂NWs by electrodeposition.The experimental results show that when the electrodeposition time is 20min,the photoelectrocatalytic ability of the electrode is the best,and the decolorization rate can reach 95.3%.?5?Preparation of Ti/Co₃O₄NWs/Ag electrode and its photoelectrocatalytic performance.First,a hydrothermal process is performed to grow a layer of Co₃O₄NWs on the surface of the titanium substrate,and then photodeposition is performed to deposit Ag particles around the Co₃O₄NWs.The experimental results show that the best deposition amount is obtained when the photodeposition time is 20 min,and the decolorization rate can reach 91.7%.