Preparation Of Tribromophenol Molecularly Imprinted Sensor

In this thesis, different molecular imprinting sensor of tribromophenol (TBP) was constructed.Firstly, the sensor of TBP was fabricated using CS as functional monomer, TBP as template molecule. As a sensor, glassy carbon electrode was coated with the TBP imprinting sensitive membrane through the electro-polymerization or titration. The effects of the amount of titration and circle number were discussed. The morphological structure of the membrane was studied by means of SEM and the sensing property of senor was studied by means of electrochemical analyses. The results showed that the morphologies and electrochemical properties of imprinted sensitive membrane was different from non-imprinted membrane, the molecularly imprinted sensor has a good detection limit (titration:1.61×10-8mol/L, electro-polymerization:1.32×10-8mol/L), as well as an excellent reproducibility (titration:RSD=5.01%, electro-polymerization: RSD=4.245%).Secondly, TBP-imprinted core-shell nanoparticles (TICSNs) were fabricated using silica nanoparticles as core material. The silica nanoparticles were modified with (3-chloropropyl)trimethoxysilan and polyethylenimine, respectively, and polymerised to form the TICSNs with ethylene glycol dimethacrylate as cross-linker, TBP as template molecule. The morphological structure of the core-shell nanoparticles was studied by means of SEM. The electrochemical analyses was easily considered that when there are TBP molecules in the surroundings of TICSNs, TBP molecules are rebounded to TICSNs based on the specific binding sites. This molecularly imprinted sensor has a detection limit of1.51×10-8mol/L, and reproducibility of the sensor is4.35%.Thirdly, With polyvinyl butyral (PVB) as the polymeric matrix, β-CD as the functional monomer, TBP as the template molecules, hexamethylene diisocyanate (HMDI) as a crosslinking agent, TBP imprinted β-CD nanofibers was constructed by electrospinning technique combined molecular imprinting technique. The morphological structure of the nanofibers was studied by means of TG, XRD, SEM and the sensing property of senor was studied by means of electrochemical analyses. The sensing property of senor showed that the molecularly imprinted composite nanofibers has the specific binding sites for TBP. This molecularly imprinted sensor has a detection limit of5.7×10-9mol/L, and reproducibility of the sensor is4.53%.