Experimental Teaching Design on Preparation and Dye Removal Performance of Quantum Dot Nanofiltration Membranes
Guided by the training of innovative talents,the research experiments about the preparation of quantum dot composite nanofiltration membranes and their dye removal performance are designed through the integration of membrane separation experiments and scientific research.Carbon nitride quantum dots are synthesized by low-temperature solid-phase method,and used as aqueous monomers to fabricate quantum dot composite nanofiltration membranes.Infrared spectroscopy and scanning electron microscopy are used to characterize and analyze the structure and morphology of the membranes.Carbon nitride quantum dots are reacted with isocyanates to form a dense and defect-free polyurea separation layer.The dye removal performance test shows that the prepared quantum dot nanofiltration membrane can effectively remove negative electric dyes such as congo red,methyl blue,bromothymol blue sodium salt and methyl red in water.With the increase of carbon nitride quantum dot concentration,the water flux of composite nanofiltration membrane gradually increases,and the methyl blue removal rate shows a trend of first increasing and then decreasing.The experiment covers literature research,material preparation,structural characterization and performance testing,which can enable students to master a variety of experimental skills and fully stimulate their innovation potential,thereby improving students'independent learning ability,scientific inquiry ability and innovative practice ability.
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