Method for detecting pH of solution by rapid microwave synthesis of carbon dots from phloroglucinol as carbon source

Abstract

The invention belongs to the technical field of chemical application, and particularly relates to a method used for rapid microwave synthesis of a carbon dot solution from phloroglucinol as a carbon source and application to detection of solution pH. The method for detecting pH of the solution comprises following steps: the carbon dot solution is synthesized from phloroglucinol as the carbon source and sulfuric acid as a medium under the condition of microwave heating, and the carbon dot solution with fluorescent characteristics is obtained; the synthesized carbon dots have the fluorescent characteristics, the maximum excitation wavelength is 365 nm, and the maximum emission wavelength is 465 nm; after the carbon dot solution is subjected to reactions with solutions with different pH values, logarithm of fluorescence intensity correlation value ratio of the carbon dot solution and pH of the solution are in a linear relation (log(IF / IFo)=-0.9283+0.3070 pH), and linear range of detectionis 1.81-5.72. On the basis of the linear relation, concentration of acetic acid can be detected.

Description

Technical field [0001] The invention belongs to the technical field of chemical applications, and specifically relates to a method for rapidly synthesizing carbon dots by microwave using phloroglucinol as a carbon source to detect the pH of a solution. Background technique [0002] Fluorescent carbon dots are one of the most popular carbon nanomaterials after fullerenes, carbon nanotubes and graphene. This kind of nano material overcomes some shortcomings of traditional quantum dots. It not only has excellent optical performance and small size characteristics, but also has good biocompatibility, easy to realize surface functionalization, and is used in biochemical sensing, imaging analysis, and environmental detection. , Photocatalysis technology, metal ion detection and drug carriers have good application potential. Synthesis methods include electrochemical method, hydrothermal method, microwave method, ultrasonic method, etc. [0003] In the early days, people used electrochemi...

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Problems solved by technology

[0003] In the early days, people used the electrochemical method to measure the pH value. However, due to the high impedance of the traditional glass electrode, it is easily damaged, and it is not suitable for the determination of the pH value in fluorine-containing solutions, and there is a "sodium error" in a highly alkaline environment. Electrochemical Encountered many problems in pH measurement

Therefore, in recent years, people have continuously developed new pH sensors, such as: organic dyes, carbon dots, silicon nanodots, copper nanoclusters, quantum dots, etc., but some still have problems such as complex probe synthesis process and troublesome detection methods

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