Lead ion responsive smart membrane and preparation method thereof, and method for detecting lead ions in water samples

A smart membrane and lead ion technology, which is applied in the field of lead ion detection, can solve the problems of complicated membrane structure, difficulty in control, and cumbersome preparation process, and achieve the effects of improving lead ion response ability, appropriate membrane pore size, and simple preparation process

Active Publication Date: 2021-07-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film prepared by this method still has the following disadvantages: ①The method of plasma grafting is not stable, the influence on the film structure is complicated, it is difficult to control, and the "two-step method" preparation process is cumbersome, which is not conducive to industrial scale-up; ② The detection of lead ion concentration cannot reach the concentration of lead in drinking water stipulated by the state, which limits the detection of lead ion concentration in drinking water in daily life; Additional pressure is required as a driving force during the flux test, which is not conducive to the convenient detection of lead ions
The above shortcomings severely limit the application of the membrane prepared by this method in the detection of lead ions.

Method used

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  • Lead ion responsive smart membrane and preparation method thereof, and method for detecting lead ions in water samples
  • Lead ion responsive smart membrane and preparation method thereof, and method for detecting lead ions in water samples
  • Lead ion responsive smart membrane and preparation method thereof, and method for detecting lead ions in water samples

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this example, a series of poly(N-isopropylacrylamide-co-benzo-18-crown-6 acrylamide) (P(NIPAM-co-B18C6Am)) (PNB) nano The microspheres are sequentially recorded as 1#~4#PNB nano-microspheres.

[0051] (1) Preparation of 1#PNB nanospheres

[0052] Using N-isopropylacrylamide and benzo-18-crown-6 acrylamide as raw materials, N,N-methylenebisacrylamide as crosslinking agent, and 2,2-azobisisobutylamidine di Hydrochloride is the initiator. Add the raw materials, cross-linking agent, initiator and deionized water into the single-necked flask, stir evenly to form a mixed solution, and then pass high-purity nitrogen into the single-necked flask for 60 minutes to remove the oxygen in the single-necked flask. Seal the single-necked flask, place it in a constant temperature water bath at 70°C and stir for 4 hours, filter the resulting reaction solution, and centrifuge the filtrate at a speed of 12000r / min. After the centrifugation is completed, remove the supernatant and add ...

Embodiment 2

[0076] In this example, the preparation method of the lead ion-responsive smart membrane is basically the same as that of Comparative Example 2, except that the mass ratio of 1#PNB nano-microsphere dry powder to polyethersulfone powder is 15:100, and the obtained The lead ion-responsive smart membrane is denoted as M-3.

Embodiment 3

[0078] In this example, the preparation method of the lead ion-responsive smart film is basically the same as that of Comparative Example 2, the difference is only that: 1#PNB nano-microsphere dry powder is replaced by 2#PNB nano-microsphere dry powder, and 2#PNB nano-microsphere dry powder is replaced by 2#PNB nano-microsphere dry powder. The mass ratio of spherical dry powder to polyethersulfone powder is 15:100, and the prepared lead ion-responsive smart membrane is designated as M-4.

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Abstract

The invention provides a lead ion-responsive smart membrane, which is composed of a polyethersulfone membrane substrate and poly(N-isopropylacrylamide-copolymerization-benzo-18-crown-6 acrylamide) nanometer microspheres. The mass ratio of the nano-microspheres to the polyethersulfone membrane base material is (12-17):100, the smart membrane has an interpenetrating membrane structure and a micron-scale membrane aperture, the surface of the smart membrane and the wall surface of the membrane pores Said nano microspheres are distributed on it; the intelligent membrane can realize the measurement of membrane flux under the driving of gravity, and the intelligent membrane has dual response performances of temperature and lead ions. The invention also provides a preparation method of the smart film and a detection method of lead ions in water samples based on the smart film, which can realize convenient and high-sensitivity detection of lead ions under normal pressure conditions.

Description

technical field [0001] The invention belongs to the field of lead ion detection, and relates to a lead ion responsive smart membrane and a preparation method thereof, and a method for detecting lead ions in water samples based on the lead ion responsive smart membrane. Background technique [0002] Many heavy metal ions, even in low concentrations, can have very serious effects on the human body and the environment. For example, the most common lead ion (Pb 2+ ), trace amounts of lead ions will cause serious harm to the human bone marrow hematopoietic system, digestive system, central nervous system and immune system, especially to children's intelligence and growth and development will cause irreversible harm. GB25466-2010 stipulates that the content of lead ions in drinking water shall not exceed 4.83×10 -8 mol / L, the concentration of lead ions in industrial wastewater shall not be higher than 2.42×10 -6 mol / L, therefore, accurate determination of ultra-low concentratio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L81/06C08L33/24C08F220/54C08F220/58C08F222/38G01N27/333
CPCC08F220/54C08J5/18C08J2333/24C08J2381/06G01N27/3335C08F220/58C08F222/385
Inventor 王圆褚良银刘壮彭寒雨骆枫谢锐巨晓洁汪伟
Owner SICHUAN UNIV
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