Preparation method and application of sensor for heavy metal ions Cd2+, Pb2+ and Cu2+ built based on alginic acid functionalized graphene

Abstract

The invention belongs to the technical field of chemical analysis or environment monitoring and provides a preparation method of a sensor for heavy metal ions Cd2+, Pb2+ and Cu2+ built based on alginic acid functionalized grapheme and a detection method of the heavy metal ions in a water body. The preparation method and the detection method have the benefits that by the utilization of carboxyl richly contained in alginic acid and a hydroxyl functional group, the heavy metal ions can be better absorbed, and in combination with the large specific surface area and the excellent electrical conductivity of the graphene, a sensing signal is enhanced, and the sensitivity is improved; according to potential difference, the different heavy metal ions Cd2+, Pb2+ and Cu2+ can be effectively distinguished; the detection method is used for the detection of the heavy metal ions Cd2+, Pb2+ and Cu2+, and the linearity ranges are 0.1-100 <mu>g / L, 0.5-100 <mu>g / L and 0.2-100 <mu>g / L respectively; the limits of detection are 0.021 <mu>g / L, 0.10 <mu>g / L, and 0.041 <mu>g / L respectively; the detection method has an important use value in the quick, sensitive and selective detection of heavy metals.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis or environmental monitoring, and relates to a heavy metal ion Cd based on alginic acid functionalized graphene 2+ , Pb 2+ and Cu 2+ The preparation method of the sensor and the detection method of heavy metal ions in water. Specifically, the use of functionalized nanomaterials to construct electrochemical sensors and electrochemical detection technology for heavy metal ions Cd in water 2+ , Pb 2+ and Cu 2+ for sensitive detection. Background technique [0002] With the rapid development of modern industry, water heavy metal pollution accidents caused by over-exploitation, accidental leakage, illegal discharge and other reasons have occurred from time to time. Heavy metal pollution is extremely harmful. It is toxic, not easy to be metabolized, and easy to be bioaccumulated. It will not only directly endanger human health, but also lead to deterioration of environmental quality. The...

AI Technical Summary

Problems solved by technology

Heavy metal pollution is extremely harmful. It is toxic, not easy to be metabolized, and easy to be bioaccumulated. It will not only directly endanger human health, but also lead to deterioration of environmental quality.