Preparation method of fluorescent carbon quantum dots and detection of al in water 3+ ionic app

Abstract

The invention relates to a method for preparing fluorescent carbon quantum dots. The steps of the method are as follows: S1: Electrolysis: Under the condition of 25 degrees Celsius, take NaOH solution and place it in a 100mL beaker, use a calomel electrode as a reference electrode, and two graphite rods as positive electrodes. negative working electrode, and ensure the distance between the two graphite rods, control the voltage and electrolysis time, and electrolytically etch the graphite rod to obtain a yellow-brown solution; S2: impurity removal: after the S1 step ends, the yellow-brown solution is Centrifugal treatment; S3: Purification: after the S2 step, put the tan carbon dot solution into a dialysis bag, and dialyze in ultrapure water for 24 hours to remove alkaline sodium hydroxide to neutral. The method for preparing fluorescent carbon quantum dots in the invention is simple, the electrochemical synthesis is completed in one step, the raw material used is graphite rods, the electrolyte is NaOH solution, and the toxicity and pollution are small. Compared with other synthesis methods, the electrochemically synthesized carbon quantum dots have high purity, good crystallinity, no other impurities, and no complicated purification and purification process after synthesis.

Description

technical field [0001] The invention relates to the technical field of preparation of carbon quantum dots, in particular to a preparation method of fluorescent carbon quantum dots and its application in detecting Al3+ ions in water. Background technique [0002] Quantum dots are a new type of quasi-zero-dimensional nanomaterials. This small size endows them with strong size confinement effects and edge effects, which will produce strong fluorescence. They are widely used in materials science, electronic devices, biochemistry and other fields. It has broad application prospects. The earliest quantum dots are generally some transition metal sulfides or tellurides, such as cadmium sulfide, cadmium telluride, etc., but because these transition metals have certain toxicity, and their synthesis conditions are relatively high, and the process is relatively complicated, these Defects greatly limit the applications of quantum dots. Therefore, large-scale synthesis of quantum dots w...

AI Technical Summary

Problems solved by technology

These reported organoaluminum ion fluorescent sensors all require a complex synthesis process, and various organic reagents have potential toxicity and environmental pollution, and most of these synthesized organic fluorescent probes are insoluble in water and cannot detect aluminum ions in water. greatly limit their practical application

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