Synthesis,Characterization Of Coordination Polymers Based Noble Metal And Their Photocatalytic Applications

Photocatalysis is the process of converting sustainable clean solar energy into other energy sources,such as photocatalytic CO₂ to methanol and photocatalytic water to hydrogen.Water splitting can convert abundant water resources into practical energy under sunlight.In addition,photocatalysis process can be connected with the organic hydrogenation reaction.So that organic hydrogenation reaction became safe and green.Hydrogen can also be used to remove the excessive expression of reactive oxygen species through its reductive properties.The by-product of hydrogen therapy is water,which has no toxic side effects on living organisms.This paper was based on the coordination polymers formed of transition metal and dye molecules by self-assembly with high photocatalytic activity.The prepared coordination polymer materials were used in energy sources,organic hydrogenation reactions and hydrogen therapy,respectively.The details are as follows:(1)The hollow tubular coordination polymers(T-Pd/Pd-Rh6G CPs)were prepared by one-step photoinduced approach.The coordination polymers had ultra-high photocatalytic activity under the photosensitizer eosin Y with the hydrogen generation rate up to 112.3 mmol?g^-1?h^-1,and has potential application for hydrogen production.In the process of photocatalysis,the hollow structure was beneficial to the light enrichment.The tube-like coordination polymers with high surface area can absorb more photosensitizers and produce more electrons.The electrons generated by light excitation were quickly transferred to the Pd nanoparticles to complete the hydrogen evolution reaction.The process improving the separation efficiency of electron holes.(2)Boat-like coordination polymers(Pd/Pd-MB CPs)were prepared by photoinduced approach through the coordination of Pd²⁺and methylene blue(MB).The Pd/Pd-MB CPs can catalyze the Knoevenagel condensation reaction at room temperature,and can generate hydrogen gas under the photosensitizer eosin Y,further to catalyze the unsaturated nitrile to generate?-alkyl nitrile through hydrogenation.In the process of catalysis,the product of the condensation reaction can fully contact with the hydrogen generated in situ.This is beneficial to complete hydrogenation reaction.The Pd nanoparticles with dual-functional catalytic can not only accelerate the electron transfer of the photocatalytic hydrogen production process,but also catalyze the organic hydrogenation reaction.(3)Three morphologies of nanoscale-Pt-Rhodamine coordination polymers were prepared by photoinduced approach through adjusting the ratio of Pt⁴⁺and Rhodamine 6G(Rh6G).EY₂₀@Pt/Pt-Rh6G CPs had a good hydrogen evolution rate under 660 nm laser irradiation,and could be used to eliminate excess hydroxyl radicals in inflammatory cells.At the same time,the loading of Pt nanoparticles had catalase activity,which could catalyze the hydrogen peroxide to oxygen.This process could remove excess hydrogen peroxide and produce oxygen.The vitro cell experiments showed that Pt/Pt-Rh6G CPs had low biological toxicity.And after 5minutes light irradiation,the reactive oxygen levels of inflammatory cells decreased significantly,and the expression of inflammatory factors(IL-6 and IL-1?)weakened.The paper used the catalytic activity of noble metals and the absorbance activity of the dye molecules to synthesize photocatalytic coordination polymers,which provides ideas for the design of photolytic water semiconductors and also expands the application of coordination polymer materials.