Preparation And Determination Of Novel Chemical Sensors For S^2- And Particular Metal Ions

In recent years,along with the rapid development of industry and agriculture as well as the technology used in environmentally protected areas,the application of chemical sensors has become widespread in many areas,such as environmental protection and monitoring,and disease prevention and control.Chemical sensors can respond with particular analytes via chemical reactions to determine the analytes qualitatively or quantitatively.Common chemical sensors include colorimetric sensors,fluorescent sensors,and electrochemical sensors.In this paper,we developed six types of chemical sensors for the detection of S^2-and metal ions.The details of the work are as follows:1.Preparation and determination of Schiff’s base colorimetric sensors（I）for Al³⁺and Schiff’s base colorimetric sensors（II）for Hg²⁺Schiff’s base colorimetric sensors（I）were synthesized from 2-hydroxy-1-naphth and isonicotinic acid hydrazide via condensation reaction.A sensitive linear range for Al³⁺ions from 1μM to 10μM was obtained.Schiff’s base colorimetric sensors（II）were synthesized from thionalide and isonicotinic acid hydrazide via condensation reaction.A sensitive linear range for Hg²⁺ions from 5μM to 50μM was obtained.2.Preparation and determination of silver nanocluster fluorescence sensor（III）for S^2-and Rhodamine derivatives fluorescence sensor（IV）for Fe³⁺New silver nanoclusters（III）were synthesized via a one-step method.The silver nanocluster fluorescence sensor（III）was applied in the highly selective detection of S^2-and a sensitive linear range for S^2-ions from 0.2μM to 10μM was obtained.The rhodamine derivative fluorescence sensor（IV）was synthesized from 2-hydroxy-1-naphth and rhodamine hydrazide via condensation reaction.A sensitive linear range for Al³⁺ions from 1μM to 70μM was obtained,and the sensor has good anti-interference ability.3.Preparation and determination of MOFs electrochemical sensor for metal ionsA cauliflower-like MIL-100（Cr）electrochemical sensor（V）was synthesized from chromic nitrate and benzenetricarboxylic acid via reflux reaction.It can simultaneously detect Pb²⁺,Cd²⁺,Cu²⁺and Hg²⁺via square wave anodic stripping voltammetry（SWASV）.A sensitive linear range for Pb²⁺,Cd²⁺,Cu²⁺and Hg²⁺ions from 1μM to 10μM was obtained,and the sensor exhibited good selectivity and stability.An NH₂-MIL-53（Cr）electrochemical sensor（VI）was synthesized from chromic nitrate and 2-amino terephthalic acid via reflux reaction.A sensitive linear range for Pb²⁺ions from 0.4μM to 80μM was obtained,and the sensor exhibited good selectivity and stability.