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A zero-valent nano-iron-nickel powder for treating dye wastewater and its preparation method

A zero-valent nano-iron and dye wastewater technology, which is applied in water/sewage treatment, chemical instruments and methods, reduced water/sewage treatment, etc., can solve the problems that cannot be applied in a large scale, zero-valent iron is easily oxidized, and the adsorption effect is single and other problems, to achieve the effect of solving the problem of recycling, excellent anti-oxidation performance and high decolorization efficiency

Active Publication Date: 2021-08-06
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, this kind of dye has a strong coloring effect. Even the dye wastewater with a very low concentration still has a high chroma, which will seriously harm the growth and reproduction of aquatic animals and plants.
Secondly, the hydrogen on the benzene ring of this kind of dye is easily replaced in water, which will produce various harmful aromatic compounds, and some even have great carcinogenicity.
Finally, some toxic pollutants in dye wastewater are difficult to degrade once formed, and will exist in the environment stably for a long time, causing irreversible damage to the ecosystem
[0003] At present, there are mainly the following three methods for the treatment of this kind of dye wastewater. The first is physical adsorption method, which uses specific adsorbents to adsorb dyes in water bodies, but the adsorption effect is single, and only for specific one or several Dyes are effective, but it is difficult to deal with complex and diverse polluted wastewater, and the treatment of adsorbents after adsorption is also a problem
The second is membrane filtration, but the membrane as a filter is easily polluted and needs to be replaced frequently, and its use cost is too high
The third is the biodegradation method. In practical applications, because microorganisms are greatly affected by various factors such as the environment and are unstable, the degradation effect on dye wastewater is relatively general, and it is not suitable for treating dye wastewater with complex components.
[0005] However, the preparation process of the above method is complicated, the energy consumption is huge, and it is easy to cause pollution.
Although this kind of zero-valent iron improves the reactivity, the problem that zero-valent iron is easily oxidized in practical applications and difficult to transport and store has not been solved, making it impossible to apply in large-scale applications in real life.

Method used

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  • A zero-valent nano-iron-nickel powder for treating dye wastewater and its preparation method
  • A zero-valent nano-iron-nickel powder for treating dye wastewater and its preparation method
  • A zero-valent nano-iron-nickel powder for treating dye wastewater and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Method for treating Congo red dye wastewater with zo-priced nanotechnical powder:

[0029] (1) Preparation of magnetic NZVIN powder:

[0030] A: 10.5g FESO 4 · 7h 2 O and 10G NISO 4 · 6h 2 O Dissolve in 200 ml of water, adjust the pH of the solution in 13 to 14;

[0031] B: 0.6mol N 2 Hide 4 · H 2 O Add aqueous solution, the water bath maintains the temperature at around 80 ° C, stirred for 15 min;

[0032] C: Add 0.1 ~ 0.15mol of FECL 3 Continue to react 15 min;

[0033] D: Wash three times with deionized water and ethanol to remove residual raw materials and reagents; the final NZVIN nano powder is obtained by magnetically separating, and then stored after drying in an oven;

[0034] (2) Decolorization treatment of azo dye wastewater: The prepared magnetic NZVIN powder is discharged from the azo dye wastewater simulated by 0.1 g / 100 mL to the Congo Red (Cr) Dye Simulation; Decolorization Process figure 1 As shown, the solution is red at the beginning, and the NZVIN is a...

Embodiment 2

[0037] Method for treating Congo red dye wastewater with zo-priced nanotechnical powder:

[0038] (1) Preparation of magnetic NZVIN powder:

[0039] A: Take 0.2mol / L FESO 4 And 0.25mol / L NISO 4 500 ml of the aqueous solution, adjusting the solution pH at 13 to 14;

[0040] B: 0.6mol N 2 Hide 4 · H 2 O Add aqueous solution to make it concentrated to 0.6 mol / L, and the water bath remained temperature at about 80 ° C, stirred for 15 min;

[0041] C: Add 400 ml of concentration FECL for 0.1 mol / L 3 Continue to react 15 min;

[0042] D: Wash with deionized water and ethanol, remove residual raw materials and reagents, and zero-free nanotechnite powder is obtained by magnetic separation.

[0043] (2) Decolorization treatment of azo dye wastewater: The prepared magnetic NZVIN powder was discharged from azo dye wastewater in ratio of 0.2 g / 100 mL to Congo (Cr) dye simulation.

[0044] (3) Recovery of magnetic NZVIN powder: Place the NZVIN-wastewater mixture after the decolorizat...

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Abstract

The invention relates to a zero-valent nano-iron-nickel powder for treating dye wastewater. The zero-valent nano-iron-nickel powder has a core-shell structure, and the particle diameter of the powder is about 60-100 nm, which is spherical and has a core. The part is FeNi alloy, the surface layer is coated with Fe 3 O 4 , using zero-valent nano-iron-nickel powder for the decolorization of wastewater containing Congo red dye. The powder has a unique core-shell structure, excellent oxidation resistance, and high decolorization rate. The excellent magnetic properties of the powder are conducive to its recovery by using a magnetic field after the sewage is dispersed. After reduction treatment, it can be recycled and reused. nZVIN powder is used in the decolorization of dye wastewater. Compared with other decolorization methods such as coagulation, electrolysis, adsorption, and biodegradation, it has the characteristics of simplicity, high decolorization efficiency, recyclability, and low cost.

Description

Technical field [0001] The present invention relates to the technical field of wastewater treatment, and more particularly to zo-priced nanofine nickel powder for treating dye wastewater and a preparation method thereof. Background technique [0002] Synthetic dyes use large-scale use of paper, textile, cosmetics, etc., causing serious water pollution problems. The azo dye is one of the synthetic dyes, which typically uses an unsaturated azo (n = n) key as a chromophore, based on sulfonic acid group (SO 3 H), amino (NH 2 ), Etc., as a helper group, and have a complex aromatic hydrocarbon molecular structure. Due to its low cost, good stability, simple use, the most widely used, is the main force of water pollution. First of all, such dyes are colored effect, even with low concentrations of dye wastewater, it still has high chromaticity, which will seriously endanger the growth and reproduction of water vivid plants. Second, such dyes are easily substituted in the water bodies in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B01J20/06C02F1/28B01J20/30B01J20/28C02F1/70C02F101/30
CPCB22F9/24B01J20/06C02F1/281B01J20/28009B01J20/28021C02F1/705B22F2009/245C02F2101/308B22F1/16
Inventor 朱正吼何帅陈杰
Owner NANCHANG UNIV