Research On Methods For Quick Scanning Of Persistent Organic Pollutants Based On Nanomaterials

With the rapid progress of industrial technology, more and more pollutantsespecially the persistent organic pollutants （POPs） are released to the environment andpose a threat to both human health and natural environment. At present, researches ofmonitoring POPs are mainly based on large instruments such as high performanceliquid chromatograph and gas chromatography-mass spectrometry. These methods arehigh-cost and time-consuming. To meet the requirements of rapidness and real-time,the research on methods for quick scanning of POPs is of great significance.This thesis selected pentachlorophenol （PCP）, polycyclic aromatic hydrocarbons（PAHs） and2-amino anthracene three typical organic pollutants as the research objects,and designed three types of methods based on nanomaterials for quick scanning ofPOPs. This thesis provides new ideas for analysis of pollutants. The main contents areas follows:（1） Proposed a direct electrochemical method for quick scanning of PCP usingPt-C/TiO₂NTs composite electrode: Highly ordered titania （TiO₂） nanotube arrays wasfabricated by anodization in fluorid contained electrolytes, Carbon layer and Ptnanoparticles were respectively modified on the TiO₂nanotubes by employingchemical vapor deposition and pulse electrodeposition technique which is facile andeasily performed. The resulting Pt-C/TiO₂nanotube eletrode with large specific area,high conductivity and good adsorbility were applied for the direct determination ofPCP in aqueous solution. The modified TiO₂nanotubes exhibit good performance forPCP determination compared with the traditional electrodes, giving a determinationlimit of2.5M.（2） Surface enhanced Raman spectroscopic detection of polycyclic aromatichydrocarbons （PAHs） using gold nanoparticles-modified alginate gel network: AAuNPs/ALG/Au/FTO composite nanomaterial was prepared based on goldnanoparticles-embeded alginate gel. The target molecules are captured by thethree-dimensional network of the alginate gel, and brought close to the hot spotsgenerated by gold nanoparticles embeded in the gel. This substrate was applied as thesubstrate for surface enhanced Raman spectrometric detection of PAHs. SignificantRaman enhancement effects were observed in the analysis of four typical PAHcompounds including pyrene, anthracene, fluorine, benzo（a）pyrene and the mixture.Limit of detections of0.485nM for BaP and0.365nM for total PAHs were achieved. The practicability of the method is tested by analyzing PAHs in different watersamples.（3） Proposed a direct electrochemiluminescence （ECL） method for quick scanningof2-amino anthracene using CdTe/FTO electrode: CdTe quantum dots were depositedon fluorine-doped tin oxide （FTO） electrode using simple pulse-electrodepositionmethod. The CdTe/FTO composite electrode exhibited good ECL property. Based onthe experiments, we found that the ECL signal of the CdTe/FTO electrode can bequenched by PAHs molecules with different degrees, and2-amino anthracene was mostobvious. Based on this,2-amino anthracene was detected with a LOD of0.256nM, andthe detection range is from1nM to10M. This method provides a new platform foranalysis of2-amino anthracene and embodies the prospect of application of quantumdots and ECL sensor in analysis of organic pollutants.