Research On Preparation And Properties Of High Sensitivity Of The Molecularly Imprinted Fluorescent Polymers To Detection Two Kinds Of Organic Pollutants In Environment

Phenolics are widely used in the coking plant, oil refineries, coal gas and other industries, which indiscriminate discharged wastewater containing phenol, have caused the phenolic substances in the water environment pollution and become more serious. 4-nitro phenol（4-NP）, a kind of commonly used pesticide, medicine, dye intermediates and other fine chemicals, has become a kind of typical toxic pollutants of water environment. In addition, due to its many varieties such as the advantages of low cost, ease of use,4-NP is still widely used with the development of the pharmaceutical industry, antibiotics agriculture and aquaculture and other industries. However, excessive use of antibiotics and even abuse, excessive antibiotics by animals or metabolism of the body’s form into the aqueous environment of the water security threat, also brought such as toxicity, serum sickness-type reaction to human health, causing cancer and other security risks. In recent years, the results for all types of water testing showed that the content of phenolic compounds and antibiotics are beyond the self-purification capacity of water bodies, such organic materials have become the main substance of water pollution. Therefore, the development of efficient and targeted detection technology has become a hot topic in the field of environmental testing. Molecular imprinting technique because of its simple operation, and a large amount of highly enriched stability and long service life, etc. has been widely used to detect and separate environmental pollutants.This thesis chooses 4-NP and sulfamethoxazole（SMO） as the target molecules, molecular imprinting technology as the main technical means, assisted by computer molecular dynamics simulation, fluorescence quantum dots as light material, respectively according to different targets prepared high performance, high sensitivity fluorescence molecular imprinting polymer materials. Based on computer molecular dynamics simulation, the optimal preparation conditions of fluorescent molecular imprinting polymer materials, a series of performance characterization and practical testing of the samples.The main research content is as follows:（1） The first use of improved hydrothermal synthesis CdTe quantum dots（QDs）, then using the method of "seed- growth" in CdTe QDs surface to form a layer of CdS hybrid of SiO₂ layer, be protected by SiO₂ layer CdTe QDs（CdTe @ SiO₂） in order to spare; then computer simulation are used to get the template molecules 4–NP,functional monomer 3-ammonia propyl-3-ethoxy silane（APTES） and crosslinking agent four ethyl silicate（TEOS）, the ratio of the optimal amount of substance between the simulated results by sol-gel preparation of molecularly imprinted on the face of the CdTe@SiO₂ layer, after removal of the template molecules, the resulting fluorescent molecular imprinting polymer（CdTe@SiO₂-MIPs）. Test results show that the optimal conditions of synthesis CdTe@SiO₂ of MIPs imprinting factor is 2.23, and the minimum detection limit of the target is as high as 0.06μmol ? L-1.（2） Design ten groups are composed of the SMO, APTES and TEOS assembling system, respectively, to discuss the amount of APTES and TEOS how much influence on molecularly imprinted binding sites, the results show that in the SMO, the ratio between the APTES and TEOS as 10:10:40, prepolymer system with specific binding between the atoms is the strongest, the highest frequency and percentage points more than 86% of the analysis scope, so in view of the SMO MIPs synthesis by SMO, molar ratio of APTES and TEOS as 10:10:40.（3） Using the method of st?ber first synthesized SiO₂, secondly SiO₂ as the carrier in the show that the synthesis of CdTe QDs, get the fluorescent nanomaterials SiO₂@CdTe, finally on the surface of SiO₂@CdTe using（2） the simulation results in the synthesis of fluorescent molecular imprinting polymer SiO₂@CdTe@MIPs; And on the basis of SiO₂ @ CdTe @ MIPs introduced Fe₃O₄ magnetic nanomaterials, get fluorescent magnetic molecularly imprinted polymer Fe₃O₄@SiO₂@CdTe@MIPs. The experimental results show that the SiO₂@CdTe@MIPs and Fe₃O₄ @SiO₂@CdTe@MIPs ability for identifying the SMO have a very good choice.