Study On Copper Nanoparticles For Detection Of Iron Ion And Catalytic Degradation Of P-Nitrophenol

To realize the rapid detection and efficient disposal of pollutants in water is an important prerequisite for the protection of water ecological environment.With the development of nanotechnology,new nanomaterials provide a new technological path for the detection and catalysis of various pollutants.Nanomaterials with different properties can be obtained by assembly and modification,which provides a new substrate material for the detection and removal of pollutants.In order to achieve the detection of iron ions in the water environment and efficient catalytic degradation of nitrophenol in wastewater,in this paper,copper nanoparticles with good fluorescence properties and enzyme-like activity were synthesized by different ligands modifications,and the detection of iron ions in water and the catalytic degradation of nitrophenol were also attempted respectively.The main research contents and results are as follows:(1)Prepared a kind of copper nanoparticles(Cu NCs@PVP)with stabilized polyvinylpyrrolidone(PVP)and good fluorescence properties,and developed a fluorescence method for distinguishing and detecting Fe³⁺and Fe²⁺ions on the basis of such material.When the p H of the solution was less than 4.0,Fe³⁺ions could selectively quench the fluorescence of Cu NCs@PVP;Additionally,when the p H was5.0,Fe²⁺icons could quench the fluorescence of Cu NCs@PVP more sensitively through Fenton reaction.Moreover,a discriminative method was developed for the determination of Fe³⁺and Fe²⁺ions based on the selective quenching of Cu NCs@PVP fluorescence by Fe³⁺and Fe²⁺ions under different conditions.Under the optimum conditions,when the iron ion concentration was 0.4?20.0?m,there was a good linear relationship between the fluorescence quenching efficiency(F/F0)of Cu NCs@PVP and Fe³⁺concentration.When the iron ion concentration was 0.01?0.4?M,the fluorescence quenching efficiency(F/F₀)of Cu NCs@PVP represented a good linear relationship with Fe²⁺concentration.The detection limit for Fe³⁺and Fe²⁺icons is 0.14?M and 0.008?M,respectively.Such developed method has good selectivity and can be used to distinguish Fe³⁺and Fe²⁺ions in environmental water samples.(2)By using two dendritic polyamides with different substitution degree and amino-terminated dendritic polyamide as the coating agent,two kinds of copper nanoenzymes(PAMAM₂@Cu CNs and PAMAM₄@Cu CNs)encapsulated by dendritic polyamidoamine were successfully prepared with obvious peroxidase-like activity;Using o-phenylenediamine as the substrate,the kinetic analysis of enzymatic reaction showed that the constants of PAMAM₂@Cu CNs and PAMAM₄@Cu CNs were 0.94 and 0.75,respectively,which has relatively higher peroxidase activity compared with PAMAM₂@Cu CNs,PAMAM₄@Cu CNs;Based on the above analysis,the catalytic degradation activity of PAMAM₂@Cu CNs and PAMAM₄@Cu CNs on typical phenolic pollutants p-nitrophenol was further investigated,which is expected to be applied in the catalytic treatment of p-nitrophenol in wastewater.For the purpose of detecting iron ions in the water environment and efficient catalytic degradation of p-nitrophenol in wastewater,copper nanoparticles with different properties were synthesized through surface modifiers,and the detection of iron ions in the water environment and catalytic degradation and removal of p-nitrophenol were achieved as well in this paper.The research results provide a technical reference for the detection and catalytic degradation of other environmental pollutants based on copper nanoparticles.