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Porphyrin optical sensing functional film suitable for detecting heavy metal ions and preparation method of porphyrin optical sensing functional film

A heavy metal ion and optical sensing technology, applied in the field of membrane materials, can solve the problems that optical indicators are difficult to recycle and affect practical applications, etc.

Active Publication Date: 2015-02-11
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these systems all occur in the solution state, and the optical indicators are difficult to recycle, which seriously affects their practical application.

Method used

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  • Porphyrin optical sensing functional film suitable for detecting heavy metal ions and preparation method of porphyrin optical sensing functional film
  • Porphyrin optical sensing functional film suitable for detecting heavy metal ions and preparation method of porphyrin optical sensing functional film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Dissolve the dried polysulfone (PSF) in chloroform, then place the round-bottomed flask in an ice-water bath, add paraformaldehyde, trimethylchlorosilane, tin tetrachloride, and the molar ratio of the three It is 100:100:1. After the temperature was raised to 50° C., the reaction was stirred by magnetic force for 40 h. After the reaction stopped, most of the solvent was removed by rotary evaporation and the concentrated solution was precipitated in 10 times the volume of ethanol, and then purified by dissolution and precipitation, the product was dried in a vacuum drying oven until the quality was constant, and the chloromethylation rate was 80%. .

[0024] (2) Chloromethylated polysulfone (CMPSF, 15wt%), polyethylene glycol 400 (PEG400, 10wt%), N-N dimethylacetamide (DMAC, 75wt%) were added in the three-necked flask successively according to the proportion, and heated Stir at 60°C for 4 hours to obtain a homogeneous and transparent casting solution. After standin...

Embodiment 2

[0030] (1) According to the method of step (1) (2) in Example 1, a CMPSF film with a chloromethylation rate of 30% and a thickness of 110 μm was prepared.

[0031] (2) Immerse the CMPSF membrane obtained in step (1) in a certain volume of 20% trimethylamine aqueous solution, and magnetically stir for 10 h in a water bath at 30° C. to obtain a quaternized polysulfone (QAPSF) membrane. Wash the QAPSF membrane with pure water until it is neutral.

[0032] (3) Immerse the QAPSF membrane in a certain concentration and volume of TPPS solution, realize the loading of TPPS by electrostatic action, and then get the QAPSF / TPPS membrane after washing with pure water, the loading of TPPS on the membrane is relative to the weight of the QAPSF membrane 3mg / g.

[0033] (4) The obtained film was characterized by an ultraviolet spectrophotometer, and its absorption wavelength in the ultraviolet absorption spectrum was 422 nm. When the membrane was placed in Tris / HCl buffer solution of pH=9.0...

Embodiment 3

[0036] (1) Add PVA (10wt%) and deionized water (90wt%) into a three-necked flask, heat and stir at 100°C until the PVA is completely dissolved, add oxalic acid (0.01-10wt%) and sulfuric acid (0.01-1wt%) to the PVA In the solution, continue heating and stirring for 3 hours to obtain an oxalic acid cross-linked casting solution, cast the casting solution on a smooth and clean glass plate, and evaporate to form a film at room temperature. The film thickness was 50 μm.

[0037] (3) Immerse the PVA film in a TAPP aqueous solution of a certain concentration and volume, oscillate and adsorb to realize the load of TAPP, and then get the PVA / TAPP film after washing with pure water, and the TAPP load is 8 mg / g relative to the weight of PVA.

[0038] (4) The obtained film was characterized by an ultraviolet spectrophotometer, and its absorption wavelength in the ultraviolet absorption spectrum was 420 nm. When the membrane was placed in Tris / HCl buffer solution of pH=9.0 with different ...

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Abstract

The invention provides a porphyrin optical sensing functional film suitable for detecting heavy metal ions. The material takes a polymer film as a solid substrate and porphyrin as an optical indicator; the polymer film realizes loading of porphyrin through a non-covalent bond or a covalent bond. After the film and the heavy metal ions with the concentration being greater than 0.01mg / L generate reaction, the color and an ultraviolet absorption spectrum are changed and can be recovered after being treated by an acidic and / or EDTA solution; the process can be repeated. Therefore, the preparation method of the functional film is simple and feasible; detection for the heavy metal ions has the characteristics of convenience, intuitiveness and high reproducibility.

Description

technical field [0001] The invention relates to membrane materials, molecular recognition, sensors and other related fields, in particular to an optical sensing functional membrane applicable to the detection of heavy metal ions and a preparation method thereof. Background technique [0002] Heavy metals generally refer to density greater than 4.5g / cm 3 Metals such as copper (Cu), gold (Au), silver (Ag), lead (Pb), arsenic (As), cadmium (Cd), chromium (Cr), mercury (Hg), etc. They generally exist widely in nature in natural concentrations, but in recent years, the mining, smelting, processing and commercial manufacturing activities of heavy metals have been increasing, causing many toxic heavy metals such as lead, mercury, cadmium, cobalt, arsenic, etc. to enter the atmosphere, water, In the cycle of soil, it causes serious environmental pollution. [0003] The detection methods of heavy metal ions mainly include atomic absorption spectrometry (AAS), atomic fluorescence sp...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N21/78B01D69/12B01D69/02B01D67/00
Inventor 张玉忠赵莉芝李敏
Owner TIANJIN POLYTECHNIC UNIV
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