Preparation Of Nano-Copper Sulphide Composite Catalysts Based On Titanium-Copper Amorphous Ribbons

The environmental pollution problem has become a big challenge of human sustainable development.As a kind of clean,cheap and renewable energy,solar energy development become the key to solve environmental problems.Semiconductor photo-catalytic technology can degrade organic pollutant to nontoxic CO₂ and H₂O completely.So photocatalytic technology will become one of the important means to deal with the problem of environmental pollution.Copper sulfide is a kind of semiconductor material with small band gap width.Because of its special catalytic activity,photoluminescence and other special physical and chemical properties,CuS has great application potential in the field of catalysis,solar cell,superconductor,gas sensor and so on.However,the synthesis method of CuS is mainly composed of hydrothermal method,chemical deposition method,sonochemical method and template method.These synthesis methods generally require higher reaction temperature,higher reaction pressure,longer reaction time and specific reaction device.These conditions limit the application of nano-copper sulfide in practical production.Therefore,it is very important to find a preparation method of nano-copper sulfide with simple operation process,mild reaction condition and low cost.Therefore,Ti-Cu amorphous ribbons was prepared by single-roll rejection technology.The nano-CuS composite catalyst was prepared by using the Ti-Cu amorphous ribbons as the substrate.Ti-Cu amorphous ribbons have high purity and relatively uniform distribution of components.There are no dislocation of crystal material,such as dislocation of crystal material,grain boundary and other microstructure defects.At the same time,Ti is chemically active and can be completely etched in the process of dealloying Uniform porous structure.The nano-crystalline cluster structure has many advantages such as large surface area and shape rule,and has become a hotspot in all countries because of its simple and controllable operation process and low production cost.In order to improve the photocatalytic activity of pure copper sulfide,copper sulfide composite photocatalyst with molybdenum,silver and iron sulfide was prepared.The microstructures,microstructure and photocatalytic properties of the catalysts were analyzed and characterized by XRD,EDS,SEM,TEM,XPS,BET and UV spectrophotometer.The effects of the addition of molybdenum on the microstructure and crystal structure of the catalyst prepared by the dealloy were studied.Secondly,the composition of the surface elements of the catalyst and the photocatalytic performance of the nano-catalyst materials were discussed.Finally,the effects of silver and iron on the structure and properties of photocatalysts with atomic ratio of 1%-3%were studied on the basis of 3%molybdenum atomic ratio.The results can be listed as follows.Ti-Cu-?Mo,Ag,Fe?alloy can form amorphous alloy by single roll rejection technology.CuS,MoS₂ catalysts were synthesized by Ti-Cu-Mo amorphous ribbons,CuS,MoS₂,Ag₂S catalysts were synthesized by Ti-Cu-Mo-Ag amorphous ribbons,CuS,MoS₂,CuFeS₂ catalysts were synthesized by Ti-Cu-Mo-Fe amor-phous ribbons by dealloying methods in 15mol/L H₂SO₄ at 90?for 48 hours.The addition of Mo element make the samples form globular structure with large number of nano-sheets.Adding Ag,Fe,globular structure gradually reduce and nanoparticles increase.The photocatalytic activity of the products have been evaluated by the degradation of MB solution under visible light.The results demonstrate that Ag3 photocatalytic performance is best,and the Ag3 photocatalytic degradation of methylene blue MB could reach about 99.8%at 60 min.In this paper,the degradation rate of the catalyst can reach more than 90%after several times of repeated experiments,which shows that the catalyst prepared by the dealloying method has good stability.