Fluorescent Probe Based On Carbon Quantum Dots For Detection Of Pollutant In Water

With the development of the society,water pollution caused by human activities has attracted increasing attentions.The overuse of antibiotics poses a serious threat to human health and pollutes the natural water body.On the other hand,hypochlorous acid has been used in many industries,such as wastewater treatment as bleach and fungicides,pharmaceutical,textile,paper making,sanitation and disinfection,the discharge of waste water containing hypochlorous acid endangers natural water bodies.Therefore,it is urgent to develop an efficient,rapid,and simple detection method for the above pollutants.Fluorescence analysis is widely used in the detection of pollutants in water due to its advantages of rapidity,simplicity,sensitivity,and high selectivity.The research of this dissertation focuses on carbon dots-based fluorescent probes,combining with molecular imprinting polymer and metal-organic frameworks,to detect naproxen and hypochlorous acid in water.The main contents are as follows:(1)A highly selective fluorescent probe for the detection of naproxen was designed by using hydrothermally-prepared carbon dots as the fluorescence chromophore,modified with 3-aminopropyl triethoxysilane as the functional monomer,naproxen as the template molecule,tetraethyl silicate as the cross-linking agent and molecularly imprinted polymer as the recognition unit.Combining the unique fluorescence characteristics and fluorescence response of carbon dots with the recognition characteristics of molecularly imprinted polymers,we obtained a fluorescence probe for the detection of naproxen in water.The detection limit of naproxen in water is determined to be 0.03 μM,and the linear range is 0.05～4 μM.The fluorescence probe shows good selectivity and anti-interference,and could be applied for the analysis of naproxen in real water.(2)Carbon dots(CDs)was encapsulated into ZIF-8 to construct the composite material ZIF-8@CDs through the in-situ synthesis method.Combining the superior optical properties of CDs and the adsorption and enrichment effect of ZIF-8,we prepared a fluorescent probe to detect hypochlorous acid in water.ZIF-8@CDs exhibited a good fluorescence response to hypochlorous acid.The detection limit of hypochlorous acid can reach to be 0.5 μM,and the linear response range is 0.5～9 μM.The fluorescent probe shows good selectivity,strong anti-interference ability,and can be used repeatedly.