Nanometer zero-valent iron-lignin composite material and application thereof

A nano-zero-valent iron and composite material technology, applied in the direction of alkali metal compounds, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of easy oxidation, easy agglomeration of nano zero-valent iron, and difficult separation, etc. Achieve the effect of not easy to oxidize, easy to store, and promote application

Pending Publication Date: 2022-03-08
BEIHUA UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the application provides a nano-zero-valent iron-lignin composite material. The composite material of the application solves the problems that the nano-zero-valent iron prepared by the prior art is easy to agglomerate and oxidize, and the lignin It is difficult to separate after adsorbing pollutants in water. It is a kind of adsorption material for water treatment that has strong magnetism, strong reducibility and rich functional groups at the same time, and is inexpensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The application provides a nanometer zero-valent iron-lignin composite material, and the preparation method of the composite material comprises the following steps:

[0027] (1) adding ferrous iron salt and / or ferric iron salt into the lignin aqueous solution and stirring to obtain a uniformly mixed first solution;

[0028] (2) Potassium borohydride or sodium borohydride ethanol solution is added in the first solution, fully stirred;

[0029] (3) After the reaction is finished, under the action of an external magnetic field, the reactant in the solution of the above step (2) is subjected to solid-liquid separation (that is, the composite material obtained by the magnetic force is used to attract the reaction and separated from the liquid), and the The solid product is washed and vacuum-dried to obtain a nanometer zero-valent iron-lignin composite material, which is stored in vacuum or in an inert gas environment.

[0030] During preparation, the mass volume concentrati...

experiment example 1

[0039] Take 0.1120g of alkali lignin and dissolve it completely in 80mL of distilled water, and dissolve 0.5560g of FeSO 4 ·7H 2 O was added to the aqueous alkali lignin solution to fully complex, and then 20mL containing 0.2270gNaHB 4 Slowly pour the ethanol solution into the above solution, shake in the shaking box, the reaction temperature is 25°C, and the reaction time is 15 minutes. After the reaction is completed, the solid-liquid separation is carried out under the action of an external magnetic field, and after being fully washed with distilled water, vacuum freezing is carried out. Dry to obtain nanometer zero-valent iron-lignin composite material.

[0040] The prepared nano-zero valent iron-lignin composite material was added to 500mg / L Congo red aqueous solution and 100mg / L rhodamine B aqueous solution respectively, after adsorption, solid-liquid separation was carried out by applying an external magnetic field, and then UV spectroscopic Photometer measures its ad...

experiment example 2

[0042] Get sodium lignosulfonate 0.2780g and dissolve completely in 80mL distilled water, and 0.5560gFeSO 4 ·7H 2 O was added to the sodium lignosulfonate aqueous solution to fully complex, and then 20mL containing 0.2270g NaHB 4 Slowly pour the ethanol solution into the above solution, shake in the shaking box, the reaction temperature is 25°C, and the reaction time is 15 minutes. After the reaction is completed, the solid-liquid separation is carried out under the action of an external magnetic field, and after being fully washed with distilled water, vacuum freezing is carried out. Dry to obtain nanometer zero-valent iron-lignin composite material.

[0043]The prepared nano-zero valent iron-lignin composite material was added to 500mg / L Congo red aqueous solution and 100mg / L rhodamine B aqueous solution respectively, after adsorption, solid-liquid separation was carried out by applying an external magnetic field, and then UV spectroscopic Photometer measures its adsorptio...

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Abstract

The invention provides a nano zero-valent iron-lignin composite material which solves the problems that nano zero-valent iron prepared by the prior art is easy to agglomerate and oxidize and the like and the problem that lignin is difficult to separate after being adsorbed in water. Meanwhile, the invention also provides a water treatment method, and the method is realized by using the nano zero-valent iron-lignin composite material. A preparation method of the nano zero-valent iron-lignin composite material comprises the following steps: (1) adding a bivalent iron salt and / or a trivalent iron salt into a lignin aqueous solution, and stirring to obtain a uniformly mixed first solution; (2) adding a potassium borohydride or sodium borohydride ethanol solution into the first solution, and fully stirring; and (3) after the reaction is finished, carrying out solid-liquid separation on reactants in the solution in the step (2) under the action of an external magnetic field, washing a solid product, and carrying out vacuum drying to obtain the nano zero-valent iron-lignin composite material.

Description

technical field [0001] The application relates to materials for water body purification, in particular to nanometer zero-valent iron-lignin composite materials and applications thereof. Background technique [0002] The process of industrialization has improved people's living standards, but at the same time it has brought pollution to water bodies, which has had a negative impact on the ecological environment and people's health. Therefore, it is necessary to adopt corresponding technical means to solve the problem of water pollution. [0003] Nano-zero-valent iron is a kind of nano-particles with large specific surface area and high reactivity, which can reduce, adsorb and co-precipitate pollutants in water, and has the ability to repair water bodies. However, the magnetism and strong reducibility of nano-ZVI make it easy to agglomerate and easily oxidized, resulting in a decrease in its reactivity, which limits its application in the field of water treatment. Therefore,...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B01J20/24B01J20/28C02F1/28B01J20/30
CPCB01J20/02B01J20/24B01J20/28009C02F1/281C02F1/286
Inventor耿晶曹霖霖仇东旭
OwnerBEIHUA UNIV