Preparation method of grading porous structure PNMA/lignosulfonic acid hybridized hydrogel

Abstract

The invention discloses a preparation method of grading porous structure PNMA / lignosulfonic acid hybridized hydrogel. The preparation method comprises the following steps: I, dissolving sodium alginate, acidic dopant and N-methylaniline in deionized water to obtain a solution A; II, dissolving oxidant and lignosulfonate in the deionized water to obtain a solution B; III, uniformly mixing the solution A and the solution B, standing, and reacting; and IV, purifying and balancing in the deionized water, and finally filtering to obtain the purified PNMA / lignosulfonic acid hybridized hydrogel. Thepreparation method is simple, mild in reaction conditions, and low in requirement on the device performance; and the PNMA / lignosulfonic acid hybridized hydrogel can be obtained only by virtue of the supermolecule self-assembling behavior of a reaction system. The obtained hybridized hydrogel has a grading porous structure of a nano dimension, has higher specific capacity and long cycle life, is particularly applicable to an energy-storage electrode material, and is wide in application prospect in the fields such as sensing, catalysis and heavy metal ion adsorption.

Description

technical field [0001] The invention belongs to the technical field of preparation of conductive polymer-based new energy materials, and in particular relates to a preparation method of a hierarchical porous structure PNMA / lignosulfonic acid hybrid hydrogel. Background technique [0002] As an important class of electrochemical energy storage materials, conductive polymers have many advantages such as low cost, less environmental pollution, high charge density, wide potential window and adjustable redox activity, and have attracted much attention in the research field of supercapacitor electrode materials. . Among conductive polymers, polyaniline has gradually become one of the most widely studied electrode materials due to its ease of preparation, high doping ability, good electrical conductivity, high electrochemical activity, high specific capacity, and excellent environmental stability. However, research data show that the cycle life of polyaniline capacitors hardly exc...

AI Technical Summary

Problems solved by technology

[0004] The preparation of poly-N-methylaniline (PNMA) is very simple, and it can be obtained by chemical oxidative polymerization or electrochemical polymerization of N-methylaniline monomers, but the polymer is used as an energy storage electrode material, especially a supercapacitor material. There are few relevant literature reports

The main reasons are: (1) The substitution of the methyl group distorts the molecular chain of the polymer, destroys the conjugation, and leads to a decrease in electrical properties, and the conductivity is only 10 -4 ~10 -2 S / cm, far lower than the 0.1-5S / cm of polyaniline; (2) PNMA always spontaneously forms smooth surface microspheres during the preparation process, and it is difficult to form porous nanostructures with larger specific surface area, while porous nanostructures is the key factor to improve the capacitive

It can be seen that PNMA is difficult to be used as a mainstream energy storage electrode material in supercapacitors due to its own electrical properties and microstructure limitations.

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