Two Electrochemiluminescence Sensing Systems Based On Sulfides For Detection Of Pentachlorophenol And Copper Ions

With the rapid development of industry,the environment pollution has been becoming more and more serious.Pollutants in water environment are drawn into the body,such as heavy metal ions,organic pollutants,which exceeds standard can cause damage to life,seriously damaging to the creature's normal activities.Thus,we need a kind of analysis method,which can quickly sensitively analyze the water environmental pollutants,for monitoring our good living environment.Electrochemiluminescence(ECL)analysis method is developed,which has the advantages of simple instrument structure,low cost,simple operation,low requirement for samples and fast analysis speed.But now the luminophor of the ECL sensing system has these disadvantages:low stability,nonreusable,poor ECL intensity and wasting of resources.Therefore,it is difficult to meet the detection for pollutants and so on.Aiming at these shortcomings,this thesis has adopted semiconductor nanomaterials as the luminophor with ultrastrong ECL intensity,and established two novel stable ECL sensing systems.Then these sensing systems have been used for detection of heavy-metal ions and pentachlorophenol(PCP)with high sensitive,rapid and selective.The main research content is as follows:(1)Construction of a novel ECL sensing system based on cadmium sulfide nanowires/reduced graphene oxide(CdS NWs/rGO)hybrids materials for the ultrasensitive detection of PCP in water environments.With S2O82-as coreactant,the ECL property of CdS NWs was discovered for the first time and used in the field of analytical testing.rGO in this system,not only could enhance the ECL intensity of CdS NWs,but also could act as the role of the immobilized platform,which improved the stability of the sensing system.The CdS NWs/rGO-based ECL sensing system could specifically detect PCP with the linear range from 1.0 × 10-14 to 1.0 × 10-8 mol-L-1 and the detection limit of 0.2 × 10-14 mol·L-1 under the optimum testing conditions.This sensing system with high sensitivity,great selective specificity,reproducibility,wider linear range,would be conveniently applied in analysis detection for PCP in real water environments.(2)Construction of a novel ECL sensing system based on cobaltosic sulfide nanoparticles/multiwalled carbon nanotubes(Co3S4 NPs/MWCNTs)hybrids materials for rapid analysing detection of the copper ions(Cu2+)in water environment.MWCNTs could serve as immobilized platform to restrain the reunion of Co3S4 NPs for improving the stability of the sensing system.MWCNTs could also accelerate the electron transfer and reduce the energy barrier to improve the Co3S4 NPs ECL intensity.The Co3S4 NPs/MWCNTs-based ECL sensing system could specifically detect Cu2+ with the linear range from 1.0 × 10-8 to 5.0 × 10-4 g·L-1 and the detection limit of 0.8 × 10-8 g·L-1 under the optimum testing conditions.With low detection limit,good selective specificity,the sensing system would provide a new strategy for the detection of trace amounts of Cu2+.