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a fe 2+ /fe 3+ Electrochemical preparation device, preparation method and application of hydroxide

A hydroxide and preparation device technology, which is applied in the field of environmental remediation, can solve the problems of high preparation cost, low product recovery rate, and practical operation difficulties, and achieve the effects of fast preparation speed, favorable product production, and strong reducing activity

Active Publication Date: 2021-05-18
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The co-precipitation method needs to strictly control oxygen in the actual operation and operate under anaerobic conditions, which brings difficulties to the actual operation and increases the production cost. In addition, there will be needle-shaped iron oxide impurities in the co-precipitation synthesis product. Product recovery rate is not high

Method used

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  • a fe <sup>2+</sup> /fe <sup>3+</sup> Electrochemical preparation device, preparation method and application of hydroxide
  • a fe <sup>2+</sup> /fe <sup>3+</sup> Electrochemical preparation device, preparation method and application of hydroxide
  • a fe <sup>2+</sup> /fe <sup>3+</sup> Electrochemical preparation device, preparation method and application of hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a Fe 2+ / Fe 3+ Electrochemical preparation device for hydroxide, used to prepare Fe 2+ / Fe 3+ Hydroxide, comprising a reactor 1, the reactor 1 is provided with an iron-containing anode 2, a porous electrode 3, a cation exchange membrane 4 and a cathode 5 in sequence from the outside to the inside, and the porous electrode 3 is attached to the iron-containing anode 2 Inside, the cation exchange membrane 4 divides the reaction chamber into an anode chamber 6 and a cathode chamber 7, and the reactor 1 is provided with a water inlet 8 and a water outlet 9, and the water inlet 8 is located at the bottom of the reactor, connected to the anode The chamber communicates, and the water outlet 9 is located at the top of the reactor and communicates with the cathode chamber 7. The iron-containing anode 2 is any one of stainless steel or pure iron or cast iron or cast steel or Masteel or gray cast iron or gray iron material; the cathode 5 is an inert e...

Embodiment 2

[0037] The anode 2 is made of stainless steel, the porous electrode 3 is made of carbon felt, and the cathode 5 is made of graphite;

[0038] (1) On the anode 2 and the cathode 5 of the reactor 1, feed a direct voltage of 16V;

[0039] (2) The NaCl solution of 1mol / L is passed into the anode chamber 6 at the water inlet 8 at a flow rate of 4mL / min, and positively charged cations Fe 2+ , Fe 3+ and Na + Enter the cathode chamber 7 through the cation exchange membrane, and the anion OH in the cathode chamber 7 — Reaction, the effluent after the reaction flows out from the water outlet 9;

[0040] (3) The water outlet 9 is connected to the aeration bottle, and argon gas is introduced into the water outlet, argon gas is used for continuous aeration, and a magnetic stirrer is used for continuous stirring until fully deoxygenated;

[0041] (4) Leave the effluent after deoxygenation to stand, pour out the supernatant after the sediment precipitates, take the sediment and wash it w...

Embodiment 3

[0043] The anode 2 is made of stainless steel, the porous electrode 3 is made of glassy carbon, and the cathode 5 is made of graphite or stainless steel;

[0044] (1) On the anode 2 and the cathode 5 of the reactor 1, feed a direct voltage of 16V;

[0045] (2) The NaCl solution of 1mol / L is passed into the anode chamber 6 at the water inlet 8 at a flow rate of 4mL / min, and positively charged cations Fe 2+ , Fe 3+ and Na + Enter the cathode chamber 7 through the cation exchange membrane, and the anion OH in the cathode chamber 7 — Reaction, the effluent after the reaction flows out from the water outlet 9;

[0046] (3) The water outlet 9 is connected to the aeration bottle, and argon gas is introduced into the water outlet, argon gas is used for continuous aeration, and a magnetic stirrer is used for continuous stirring until fully deoxygenated;

[0047] (4) Leave the effluent after deoxygenation to stand, pour out the supernatant after the sediment precipitates, take the s...

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Abstract

The present invention relates to a kind of Fe 2+ / Fe 3+ The electrochemical preparation device and preparation method and application of hydroxide, the electrochemical preparation device of the present invention is used to prepare Fe 2+ / Fe 3+ Hydroxide, including a reactor, in which an iron-containing anode, a porous electrode, a cation exchange membrane, and a cathode are arranged in sequence from the outside to the inside, the porous electrode is attached to the inside of the iron-containing anode, and the water inlet is located at The bottom of the reactor, the water outlet is located at the top of the reactor; the electrochemical preparation method includes passing through a direct current voltage on the anode and cathode of the reactor; the water inlet is passed into NaCl solution at a certain flow rate; Inject argon, continue to aerate until fully deoxygenated; take the precipitate and wash it with anaerobic water for many times to obtain Fe 2+ / Fe 3+ hydroxide. The present invention has low production cost, high yield, simple process, and can quickly and efficiently prepare Fe 2+ / Fe 3+ Hydroxide and applied to water environment restoration.

Description

technical field [0001] The invention relates to the technical field of environmental remediation, in particular to a Fe 2+ / Fe 3+ Electrochemical preparation device and method of hydroxide. Background technique [0002] Fe 2+ / Fe 3+ Hydroxide is a reductive iron-based hydroxide, commonly known as green rust, which is a typical layered double hydroxide, containing ferrous ions and iron ions, and its molecular structure is [Fe(Ⅱ ) 1-x Fe(Ⅲ) x (OH) 2 ] x+ ·[(x / n)A n- , mH 2 O] x- , where A n- Represents the anion mixed in the green rust layer, x represents the molar ratio of ferric iron to total iron (0.25-0.33). Common patina includes patina mixed with sulfate, patina mixed with carbonate, and patina mixed with chloride ions. Fe 2+ / Fe 3+ As a kind of iron-based hydroxide with reducing activity, hydroxide has high chemical reduction activity to heavy metal ions and halogenated organic substances, and plays an important role in water environment restoration and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B9/19C25B1/01C25B11/031C02F1/467C02F101/20
CPCC02F1/4678C02F2101/20C25B1/00
Inventor 黄理志杨攀陈轶群刘子正
Owner WUHAN UNIV
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