Structure Regulation And Photocatalytic Hydrogen Production Of Titanium Oxide/Gold Nano-multilayers

The unique structure of two-dimensional?2D?materials has shown excellent physicochemical properties in many fields.In the field of semiconductor catalytic materials,two-dimensional titanium oxide nanosheets?TNs?,which have long been the focus of attention,are representative catalysts,which not only have the advantages of being non-toxic and easy to assemble,but also have good stability and more surface.The active site can be widely used in the field of photocatalysis.However,due to factors such as high photoelectron-hole recombination rate,no visible light responsiveness,and excessive band gap,the effective application of TNs in photocatalytic degradation of organic matter and photolysis of hydrogen is limited.Therefore,this paper proposes the preparation of ordered[polyacrylamide hydrochloride?PAH?/two-dimensional titanium oxide?TNs?nanosheets/gold nanoparticles]organic-inorganic composite light controllable on the surface of quartz substrate by layer-by-layer assembly method.Catalytic structure,study the synergistic effect of each component,the structure-activity relationship of the composite structure,adjust the assembly structure,and form the scientific understanding and design principles for the preparation of high-efficiency composite catalytic structure.First,a solid phase-synthesized layered titanate precursor was peeled off by a method in which an organic solvent was swollen and peeled off to prepare a single-layer or a small-layer titanium oxide nanosheet.Two kinds of gold nanoparticles with different particle sizes were obtained by simple sodium citrate reduction method.PAH,TNs and AuNPs were used as assembly primitives,and?PAH/TNs?_n-AuNPs?a:b?multilayer film were successfully prepared by layer-by-layer self-assembly method.In addition,the layer-by-layer assembly method has unique advantages in the precise control and high reproducibility of the interface order structure,and provides a model for designing and preparing high-efficiency catalytic structure,and obtains a high-performance photocatalytic interface structure.The effect of the number of assembled layers“n”on photocatalytic performance was studied,and the effect of particle size of gold nanoparticles on photocatalytic performance was investigated.Finally,by adjusting the assembly structure,optimizing the distribution ratio of each group,and controlling the reaction conditions,the composite multilayer film has good photocatalytic hydrogen production performance,and exhibits excellent production with the help of simulated sunlight and no promoter Pt.Hydrogen activity,hydrogen production rate of 5.21 mmol·g^-1h^-1.