Preparation method of ZIF-8-coated light-emitting polyacid composite material and application of ZIF-8-coated light-emitting polyacid composite material to detection of sulfur ions

Abstract

The invention relates to a preparation method of a ZIF-8 coated luminous polyacid composite material and application of the ZIF-8 coated luminous polyacid composite material to detection of sulfur ions, and belongs to the technical field of ion detection materials. The preparation method comprises the following steps of: dissolving Zn(NO3)2.4H2O in methanol to form a solution A; adding EuW10 into water, then adding lithium salt, and continuously stirring until the EuW10 is completely dissolved to form a solution B; dissolving 2-methylimidazole in methanol to form a solution C; and slowly dropwise adding the solution B into the solution C, carrying out primary ultrasonic treatment, after the solution is clarified, quickly adding the solution A and carrying out secondary ultrasonic treatment, transferring the mixed solution into a 50 mL reaction kettle, reacting for 4-10 hours at the temperature of 50 DEG C, and carrying out centrifuging, washing and vacuum drying. Li < + > can increase the luminous intensity of EuW10 and improve the solubility of EuW10 in a reaction system, and Li < + > is substituted into a ZIF-8 cavity with a hydrophobic surface. The lowest detection limit is 1.15 mu M and is superior to 1.25 [mu]M reported in the prior art.

Description

technical field [0001] The invention belongs to the technical field of ion detection materials, and specifically relates to a synthesis method of a zeolite imidazolium salt (ZIF-8)-wrapped multi-acid anion composite nanometer fluorescent probe material and its application in aqueous solution for ion detection. Background technique [0002] Sulfur ions are widely present in the manufacturing process of various chemical products such as sulfuric acid, dyes, and cosmetics. When they enter the water or the air, they will irritate the skin and mucous membranes, and paralyze the respiratory system. If exposed to high concentrations of S for a long time 2- The environment can also cause diseases such as liver cirrhosis and diabetes. Even short-term exposure can cause symptoms such as nausea and dizziness, which poses a greater risk to human life and health and the natural environment. In addition, if sulfide ion pollution is under acidic conditions, S 2- will be transformed into t...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a preparation method and ion detection application of ZIF-8 wrapped luminescent multi-acid composite material, which can make better use of EuW 10 Excellent luminescent properties, overcome the problems of being easily quenched in the aqueous phase and low solubility in the organic phase, and solve the problem of EuW 10 The problem of extremely low solubility in organic alcohols enhances the luminous intensity of polyacids and also reduces EuW 10 The fluorescence quenching behavior in aqueous solution significantly increases the EuW 10 fluorescence stability

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