Study On Preparation And Properties Of Nickel Oxide Photoelectrocatalytic Materials

Based on the current state of the water environment,especially the organic wastewater generated by printing and dyeing industry,which has the characteristics of strong toxicity,hard to degrade,and deep chroma,etc.,puts pressure on the environment that cannot be ignored.Exploring an environmental friendly,efficient,economical,and energy-efficient treatment method for printing and dyeing wastewater has attracted widespread attention.The traditional photocatalytic technology is due to the electron-hole recombination,which results in a low carrier utilization rate.Photoelectrocatalysis promotes the separation of photogenerated electrons and holes by applying an external electric field during the catalysis process,so it can greatly improved the utilization of quantum.At the same time,the electrocatalytic process can generate active groups such as hydroxyl radicals,which can catalyze oxidation reactions with organic pollutants.The technology of photoelectrocatalysis also has the advantages that the working electrode can be reused and easy to recycle.Nickel oxide,as the research focus of this paper,is a kind of catalyst material with good conductivity,remarkable photocatalytic performance,and low price.In this paper,reactive brilliant blue is used to simulate printing and dyeing wastewater,and the photoelectrocatalytic activity of catalytic materials is studied by XRD,SEM,PL,DRS and other characterization methods.The specific research content are as follows:（1）Preparation and research of F^--NiO/Ti electrode.Hydrothermal method and sintering method were used to prepare fluorine-doped nano-nickel oxide on the titanium substrate,and then optimized the hydrothermal conditions to obtain high-performance membrane electrodes.The results show that the prepared electrode when the hydrothermal temperature is 100℃shows the best degradation effect of simulated dye wastewater,and the degradation rate can reach 81.77%in two hours of operation.（2）Preparation and research of GO-NiO/Ti electrode.The titanium-based nano-nickel oxide base electrode was prepared by hydrothermal method,graphene oxide was deposited on the electrode surface by electrophoresis,and the electrophoresis time was optimized to obtain a high-performance modified electrode.The results show that when the electrophoresis time is15 minutes,the electrode has the best degradation activity for simulated dyeing wastewater（reactive brilliant blue KN-R）,and the degradation rate can reach 84.45%in two hours of operation.（3）Preparation and research of GO-NiO-Co₃O₄/Ti electrode.Nickel and cobalt bimetallic oxides（NiO and Co₃O₄phases）were prepared on the surface of the titanium substrate by one-pot hydrothermal method,and the hydrothermal conditions were adjusted to optimize the performance of the high-membrane electrode.Then,electrophoresis method is used to load graphene oxide on the prepared electrode to form a bicomponent film electrode.The results show that when the hydrothermal temperature is 120℃,the photoelectrocatalytic effect of the film electrode deposited on the surface of GO is the best（degradation of active brilliant blue KN-R）,and the degradation rate can reach 89.93%in two hours.（4）Preparation and research of NiO-black TiO₂/Ti electrode.First,anodizing/hydrogen thermal reduction method was used to prepare black TiO₂nanotube arrays on the surface of the matrix titanium mesh,and then the dipping method was used to load NiO on the surface of the basic electrode.By optimizing the dipping conditions（changing the concentration of the mother liquor）,high performance membrane electrodes were obtained.The results show that when the concentration of the immersion mother liquor is 1.5 mol/L,the electrode shows the best degradation effect of simulated dye wastewater（reactive brilliant blue KN-R）,and the degradation rate can reach 83.68%after two hours.（5）NiO/Ti electrode catalytic activation of persulfate to degrade simulated dye wastewater.The NiO/Ti electrode was prepared by hydrothermal method,using it as the anode,and electrocatalytic activation of persulfate was used to degrade simulated dyeing wastewater（reactive brilliant blue KN-R）.By optimizing electrocatalytic conditions,the degradation effect of the simulated dye wastewater was improved.The results show that when the current applied in the degradation process is 30 m A,the degradation effect of the simulated dye wastewater is the best,and the degradation rate is as high as 92.81%in two hours.