Preparation Of Fluorescent Nanoclusters And Study On Heavy Metal Ions Detection

Mineral resources are the material basis of national economic and social development.The exploitation and utilization of mineral resources have the important impetus to the development of the National economy, but also brings the serious environmental problems.Lead ion(Pb2+) is a kind of common heavy metal pollutant, has high toxicity. It is difficult to operate the lead ion detection method. Therefore, it is of great significance to study the method of lead ion concentration in wastewater treatment for lead pollution.In this experiment, a novel nano material with the detection of Pb2+ was constructed. It exhibits sensitive detection of Pb2+, and the detection limit can reach to 10-10 mol/L.The Ag Nanoclusters stabilized by poly(acrylic acid) were prepared and rearched their detection of Pb2+ ion. First, we prepared Ag-PAA fluorescent nanoclusters and investigated the influencing factors to the fluorescent properies of Ag nanoclusters including reactant molar ratio, pH, UV illumination(photochemical synthesis long on the fluorescence properties of prepared Ag Nanoclusters, determine the best preparation conditions for: NaOH solution was used as buffer solution, adjusting the pH to 5.5. The amount of reactant AgNO3 and polyacrylic acid(PAA) material ratio is 15:1; obstacle light irradiation time was 1h). The Ag Nanoclusters were characterized by TEM, UV, FT-IR and so on. Secondly, in order to reserach the sensitive detection of Pb2+, we added Ca2+, Mg2+, Na+, Zn2+, Cd2+, Co2+, Fe2+, K+, NH4+, and Pb2+ ions into the as-prepared nanocluster solutions.The quenching effect between Ag nanoclusters and metal ions was investigated and found the quenching effect between Pb2+ and Ag nanoclusters shows higher than the other ions. Finally, it proves the Ag nanoclusters have practical application value for the detection of Pb2+.