Research On Size-dependent Catalytic Hydrogenation Properties Of Ruthenium Nanoparticles And Their Analytical Applications

Due to Ruthenium has lots of advantages,such as,empty orbit,easy coordination,electronic and easy to bond.Hence.Ruthenium as a precious metal element,make it as an ideal catalyst.It is well known that size is an important factor affecting the catalytic activity of noble metals.However,the size effect of ruthenium nanoparticles(Ru NPs)in the catalytic field was rarely studied.The main reason is that different sizes of Ru NPs are difficult to synthesize.In this paper,Ru NPs as the research object,research on dimensional effect of catalytic hydrogenation properties,research their application in detection and application.Specific contents include:1.By adjusting the pH and temperature of different particle size Ru NPs,in-depth understanding of ruthenium nanoparticles in the formation process of crystal nucleation and growth mechanism.The controllable synthesis of ruthenium nanoparticles was investigated,and the factors influencing the controllable synthesis of nanoparticles were investigated.And through a series of characterization methods,the different particle size of Ru NPs have a certain understanding of the property.2.The use of Ru NPs excellent catalytic hydrogenation catalytic reduction of nitro compounds,the p-nitrophenol(p-NP)was chosen as the representative of the aromatic nitro compound.The reaction product was monitored by high performance liquid chromatography(HPLC),and the reaction rate was calculated by UV-Vis spectrophotometer(UV-Vis).Compared with other noble metal nanoparticles,the catalytic hydrogenation activity of Ru NPs was investigated.At the same time,the effects of different sizes of Ru NPs on the catalytic activity were studied,and the mechanism of the effect of size on the catalytic activity was proposed.And finally through the catalyst of the recycling test,proved Ru NPs can be reused.3.Catalytic degradation of azo dyes by catalytic catalytic hydrogenation of Ru NPs and its catalytic mechanism.The process of decolorization of dye by UV-Vis was studied.It was found that the rate of addition of Ru NPs was several times or even several times faster than that without catalyst.4.It was found that hydrogen sulfide(H2S)could induce Ru NPs poisoning and reduce the catalytic activity of Ru NPs.By combining this property with Ru NPs catalytic degradation of azo dyes,a rapid and highly sensitive method for the determination of hydrogen sulfide was established.The detection limit of the parameter can reach 0.6 nM/L,and the test method was highly selective and can be applied to the detection of the actual sample.The same method was based on the principle of detection of H2 S by Ru NPs.The detection method can also detect amino acids with mercapto groups in biological samples,such as cysteine and glutathione.Therefore,the detection method can be applied to the detection of H2 S in environmental samples and biological samples.