Investigation Of Nano Particles Catalyzed Chemiluminescence Method In The Environmental Monitoring Analysis

Chemiluminescence(CL) is defined as the emission of light from an electronically excited state species which is produced during the course of a chemical reaction, and is observed when an electronically excited product or intermediate formed during a chemical reaction decays to the ground state by emitting a photon.Chemiluminescence analysis has been great developed due to its attracting features including simple cheap optical systems requiring no light sources,high sensitivity, low detection limit, wide linear dynamic and inexpensive instruments. Up to now, the CL analysis has been applied in environmental, clinical, biological, and pharmaceutical fields and is becoming one of the most powerful techniques for use in analytical chemistry. In past years, researches were mainly devoted to the molecular or ion chemiluminescence. Nano materials exhibit size quantum effects,mall size effect,surface effect,macroscopic quantum tunneling effect and dielectric confinement effect that differ from both their bulk material and the individual atoms from which they comprised.With these unique properties, nanoparticles are particularly attractive in the applications of chemiluminescence(CL). This method comes to the most important research subject, which has inlarged the practical of chemiluminescence application in environmental and other departments and also has very important research significance.This dissertation comprises two parts, the first part is a review, which introduce the characteristics of nanomaterials, the application of chemiluminescence, and the research progress of catalytic chemiluminescence in environmental detection; the second is research report, using ZnO-ZrO2,TiO2and CoCO3as catalytic luminescent materials to study the chemiluminescence behavior of different volatile gases such as acetone, benzene and formaldehyde in the surface of nanomaterials. Includes:1. When it passed over the surface of ZnO-ZrO2with the mass ratio of4’.1, acetone gas sensor based on this kind of CL was developed. The results showed that the sensor was of high sensitivity and selectivity to the determination of methanol gas. The gas sensor could be working for more than106h and showed the longevity and steady performance and was applied to the online determination of acetone successful.2. A novel method based on cataluminescence (CTL) generated on the surface of a nanometer TiO2was proposed for direct determination of benzene and its analogies in air,and successfully used for the analysis of synthetic samples.3. Cataluminescence behavior of ethanol upon catalytic oxidation on Al2O3-TiO2-Y2O3was studied. The results showed that the sensor using this catalytic oxidation could be used for high sensitive and selective detection of ethanol.4. A novel method based on cataluminescence generated on the surface of a nanometer CoCO3was proposed for direct determination of formaldehyde in air.